NCT05418335
Oral Health and Vitamin D in Stroke Patients No drug interventions Not Available Not Available completed NCT05447065
Impact of Vitamin D Supplementation on COVID-19 Vaccine Response and IgG Antibodies in Deficient Women. No drug interventions supportive_care Not Available completed NCT03369379
Valuation of Efficacy and Safety of Vitamin D3 Use in 80 Women Diagnosed With Fibromyalgia. Using FIQ Score and VAS. treatment 4 completed NCT02349282
The Effect of Calcifediol (Hy.D 25 SD/S) and Vitamin D3 on Muscle Strength in a Frail Elderly Population No drug interventions treatment Not Available completed NCT02360644
Drug Metabolizing Enzyme and Transporter Function in Chronic Kidney Disease No drug interventions other Not Available completed NCT03478475
Vitamin D Supplementation and and Glycemic Indexes No drug interventions prevention Not Available completed NCT02186106
Dosage Calculation for Vitamin D Treatment treatment 4 completed NCT00968734
Vitamin D Status After Single Oral Dose of Cholecalciferol in Low Fat Meal Compared to High-fat Meal No drug interventions treatment Not Available completed NCT03356730
Effect of Vitamin D Replacement on Bone Healing in Mini-dental Implants treatment 1 unknown_status NCT03665974
The Relation Between Vitamin D and Gestational Diabetes Mellitus No drug interventions Not Available Not Available completed NCT02297568
Vitamin D Supplementation During Lactation treatment Not Available completed NCT01779908
Role of Vitamin D in the Prevention and Treatment of Diseases Associated With Insulin Resistance No drug interventions prevention Not Available completed NCT03652987
Endocrine and Menstrual Disturbances in Women With Polycystic Ovary Syndrome (PCOS) No drug interventions Not Available Not Available suspended NCT01050387
Effects of Vitamin D Dose and Genotype of the Binding Protein in Infants and Children No drug interventions treatment Not Available completed NCT00412087
Vitamin D Status of Pregnant Women and Their Children in Eau Claire, South Carolina prevention 3 completed NCT02166333
Study To Understand Fall Reduction and Vitamin D in You No drug interventions prevention Not Available terminated NCT01741233
The Genetics Behind Vitamin D Status (VitDgen) No drug interventions basic_science Not Available completed NCT01992133
Effects of Vitamin D Supplementation on Glucose Metabolism in Women With Former Gestational Diabetes Mellitus No drug interventions treatment Not Available completed NCT05802433
The Genetic Effects on Vitamin D Supplementation No drug interventions basic_science Not Available recruiting NCT05415254
Calcitriol Supplementation in COVID-19 Patients treatment Not Available unknown_status NCT05549154
A Study on Prevention Strategies for CKD-SHPT and Related Complications Based on General Vitamin D Supplementation prevention Not Available recruiting NCT00909454
Vitamin D Supplement Study for Adolescents No drug interventions basic_science Not Available completed NCT00674154
Effect of Vitamin D Treatment in Primary Hyperparathyroidism treatment 2 / 3 completed NCT01417351
Effects of Vitamin D Supplementation During Pregnancy on Clinical Outcomes and Immune Function No drug interventions basic_science Not Available completed NCT02217553
The Effect of Vitamin D Supplementation on HIV-associated Platelet Hyperreactivity prevention Not Available completed NCT01038453
Effects of Vitamin D Supplement Before and During Pregnancy on Birth Weight No drug interventions treatment Not Available unknown_status NCT00968877
Vitamin D and Chronic Renal Insufficiency treatment 3 completed NCT01726777
Effect of Vitamin D Supplementation on Glucose Tolerance in Subjects at Risk for Diabetes With Low Vitamin D. No drug interventions treatment 2 completed NCT02553447
Cholecalciferol in Newly Diagnosed Non-Hodgkin Lymphoma or Chronic Lymphocytic Leukemia With Vitamin D Deficiency No drug interventions treatment Not Available active_not_recruiting NCT03586947
Association Between Vitamin D and the Risk of Uterine Fibroids treatment Not Available unknown_status NCT01426347
Treatment of Vitamin D Deficiency in Patients With Rheumatoid Arthritis treatment Not Available completed NCT01385345
Vitamin D Replacement in Insulin Resistant South Asians basic_science Not Available terminated NCT03391245
Vitamin D Level and Risk of Infections in Cirrhotic Patients No drug interventions Not Available Not Available unknown_status NCT03536845
Vitamin D Supplementation to Prevent Vitamin D Deficiency for Children With Epilepsy prevention 3 completed NCT02539745
Associations of Vitamin D Deficiency and Vitamin D Receptor Polymorphisms With the Risk of Primary Open-angle Glaucoma No drug interventions Not Available Not Available completed NCT05385445
Electronic Medical Records to Increase Adherence to the Choosing Wisely Recommendations No drug interventions health_services_research Not Available completed NCT02158598
Comparison of Changes in Serum 25(OH)D Concentrations Following Vitamin D Supplementation With Chewable Tablets Versus Pills treatment 4 completed NCT01175798
Impact of Vitamin D Repletion in Hemodialysis Patients treatment Not Available completed NCT00948298
Effect of Vitamin D3 on Vascular Function prevention Not Available completed NCT03402698
Vitamin D Supplementation in Children No drug interventions prevention Not Available completed NCT03742505
Rapid Normalization of Vitamin D Deficiency in PICU treatment 3 recruiting NCT01410305
Vitamin D and HIV-Cardiovascular Disease in Children and Young Adults No drug interventions Not Available Not Available completed NCT01443897
Effect of Consumption of Post-harvest UV-B Treated Mushrooms on Vitamin D Status of Healthy Adults No drug interventions basic_science Not Available completed NCT03070483
Blood Pressure in Blacks and Calcium (BBC) and Vitamin D Study prevention 2 completed NCT01589783
Vitamin D During Pregnancy No drug interventions Not Available Not Available completed NCT02087683
Effect of Vitamin D Supplementation in Patients With Heart Failure and Vitamin D Deficiency No drug interventions treatment Not Available unknown_status NCT00279461
Vitamin D Deficiency Causes Immune Dysfunction and Enables or Perpetuates the Development of Rheumatoid Arthritis treatment 2 withdrawn NCT03602261
Safety, Efficacy, PK and PD of CTAP101 (Calcifediol) ER Capsules for SHPT in HD Patients VDI treatment 2 unknown_status NCT04906161
Vitamin D and Serum Calcium Level Insufficiency and Early Dental Implant Failure No drug interventions Not Available Not Available unknown_status NCT01214928
Hemodialysis Vitamin D Pilot treatment Not Available completed NCT02295228
Hip Arthroplasty and Vitamin D Status No drug interventions Not Available Not Available completed NCT01025128
Vitamin D Status in Males in Jerusalem Area and Its Correlation to Parathyroid Hormone (PTH) Level and Bone Mineral Density screening 4 completed NCT02186028
Effect of Oral Daily Supplementation With 400 IU Vs 200 IU of Vitamin D in Term Healthy Neonates prevention 4 completed NCT03648528
Cholecalciferol Supplementation Effect on Parathyroid Hormone in Hemodialysis Patients treatment 4 completed NCT04476511
The Efficacy and the Safety of Vitamin D3 30,000 IU for Loading Dose Schedules treatment 3 completed NCT01816711
Vitamin D Levels in Frail Elderly Patients With a Hip Fracture No drug interventions Not Available Not Available completed NCT01971411
Vitamin D Deficiency in Elderly African American Women in Central Texas Not Available Not Available completed NCT05151393
Correlation Between Serum Vitamin D3 and Incidence of Uterine Leiomyoma No drug interventions Not Available Not Available unknown_status NCT05047393
Vitamin D Level and Pain Type in Coccygodynia No drug interventions Not Available Not Available unknown_status NCT02271971
Effect of Vitamin D Supplementation on Metabolic Parameters of Patients With Psoriasis No drug interventions treatment Not Available completed NCT01229878
Vitamin D Supplementation in Kidney Disease No drug interventions treatment Not Available completed NCT01432678
Vitamin D Status in Pediatric Asthma No drug interventions Not Available Not Available completed NCT03615378
Maintenance Dosing of Vitamin D in Crohn's Disease No drug interventions treatment 0 terminated NCT01465178
Improving the Understanding of the Response to Vitamin D Supplementation No drug interventions diagnostic 3 completed NCT05018988
Vitamin D in School Children No drug interventions prevention Not Available recruiting NCT00610688
Controlled Trial of Prenatal Vitamin D3 Supplementation to Prevent Vitamin D Deficiency in Mothers and Their Infants prevention 3 completed NCT02438488
Vitamin D and Mortality: an Individual Participant Data Meta-analysis of Standardized 25-hydroxyvitamin D No drug interventions Not Available Not Available completed NCT03608488
The Effect of Vitamin D and Exercise on Balance in Postmenopausal Women No drug interventions prevention Not Available completed NCT01170507
Magnitude of Changes in 25 OH Vitamin D3 Levels After Vitamin D3 Supplementation treatment 1 / 2 withdrawn NCT01537809
Impact of Vitamin D Supplementation on Cardiometabolic Risk Factors [The Daily D Health Study] No drug interventions prevention Not Available completed NCT03773809
Impact of Vitamin D3 Administration on Cardiac Autonomic Tone in Asthma Chronic Obstructive Pulmonary Disease(COPD) Overlap Patients No drug interventions supportive_care Not Available completed NCT01696409
The Effect Of Vitamin D On Measures Of Bone Health And Gene Expression No drug interventions Not Available Not Available completed NCT01570309
Vitamin D Repletion in Coronary Artery Disease treatment Not Available completed NCT03385356
Impact of Vitamin D Supplementation in Patients With Multiple Sclerosis treatment 4 completed NCT01306656
Vitamin D Repletion in Primary Hyperparathyroidism treatment 4 completed NCT02941185
Multi-dose Vitamin D Supplementation in Preterm Infants prevention 4 completed NCT02563015
Can Correction of Low Vitamin D Status in Infancy Program for a Leaner Body Composition? No drug interventions treatment Not Available terminated NCT02876315
The Effect of Combinatorial Nutritional Supplementation on Immune Function in Healthy Older Adults No drug interventions prevention Not Available completed NCT01993537
The Role of Vitamin D in the Pathophysiology of Chronic Failure treatment 4 completed NCT03289637
Supplementation With Vitamin D to Patients With Heart Failure (D-Heart). No drug interventions treatment Not Available unknown_status NCT01497132
Effects of Vitamin D on Beta Cell Function and Insulin Sensitivity in Pre-diabetes and Diabetes Mellitus Type 2 treatment 4 completed NCT00736632
Vitamin D, Insulin Resistance, and Cardiovascular Disease treatment Not Available completed NCT04323852
Can Vitamin D Reduce Heart Muscle Damage After Bypass Surgery? prevention 4 completed NCT02243800
Study of the Efficacy and Safety of Cholecalciferol Supplementation on the Activity of Rheumatoid Arthritis in Patients With Vitamin D Deficiency No drug interventions Not Available 3 unknown_status NCT01187459
Vitamin D in Pediatric Crohn's Disease No drug interventions prevention 4 completed NCT02743559
Does Vitamin D Alter Bone's Response to Vibration? No drug interventions prevention Not Available withdrawn NCT05706259
A Comparative Dissolution and Absorption Study of an Orodispersible Powder, Chewable Tablet and Soft Gel Capsule Vitamin D3 Supplementation No drug interventions treatment Not Available completed NCT03099759
Vitamin D Raising and Maintaining Blood Serum 25(OH)D3 Levels No drug interventions basic_science Not Available completed NCT02054975
Vitamin D in Pediatric Asthma: a Randomized Controlled Open-label Pilot Trial treatment Not Available unknown_status NCT05702970
Beneficial Effects of Vitamin D Combined With Oral Iron Supplementation in Patients With Chronic Heart Failure and Iron Deficiency treatment 4 not_yet_recruiting NCT03609970
Vitamin D and Immunity: Photosynthesis Versus Supplementation No drug interventions basic_science Not Available completed NCT01656070
Vitamin D Supplementation in HIV-infected Youth treatment 2 completed NCT01183442
Vitamin D Supplementation in CAD and Postchallenge Hyperglycemia treatment 3 terminated NCT00585442
Effects of Vitamin D on Renin Expression in Hypertensive Patients treatment 0 terminated NCT03310242
Comparison of Sunlight Exposure and Vitamin D Supplementation on Serum 25-hydroxyvitamin D Levels No drug interventions treatment Not Available completed NCT04404842
Development of a Screening Tool for the Risk of Vitamin D Deficiency No drug interventions Not Available Not Available unknown_status NCT04010942
Vitamin D for Polycystic Ovary Syndrome Clomiphene Resistant Women treatment 4 completed NCT02132442
Hepatic Dysfunction, Vitamin D Status, and Glycemic Control in Diabetes No drug interventions treatment 3 completed NCT04450199
Does Supplementing Vitamin D Deficiency Affect Fusion Healing Rates in Elective Foot and Ankle Surgery? treatment 0 completed NCT04377399
High vs Low Dose Vitamin D in Patients With Diabetic Peripheral Neuropathy treatment 4 completed NCT00756899
Vitamin D Deficiency and Low Bone Mineral Content in Children No drug interventions Not Available Not Available completed NCT03882099
Vitamin D Level and Its Relation to Pre-eclampsia and Eclampsia No drug interventions Not Available Not Available unknown_status NCT03162406
Effects of Vitamin D Supplementation During a Non-surgical Treatment of Generalized Chronic Periodontitis No drug interventions treatment Not Available unknown_status NCT03087149
Monitored vs Standard Supplementation of Vitamin D in Preterm Infants No drug interventions prevention Not Available completed NCT03611049
Improving Functionality in Older People No drug interventions treatment 2 terminated NCT04276649
A Retrospective Analysis: the Influence of Caltrate Supplement on the Effect of Mesalazine in Ulcerative Colitis No drug interventions Not Available Not Available completed NCT05848349
Vitamin D Status Among Infertile Women in Sweden No drug interventions Not Available Not Available completed NCT01208636
Environmental & Genetic Influences on Vitamin D Status No drug interventions Not Available Not Available completed NCT02019836
Comparison of Maternal and Neonatal Vitamin D Levels in Term Neonates With and Without Early Onset Sepsis No drug interventions Not Available Not Available completed NCT03477136
Serum and Semen Vitamin D Level With Semen Parameters No drug interventions Not Available Not Available unknown_status NCT03334136
The Effect of Vitamin D Supplementation on Psoriasis Severity No drug interventions treatment Not Available completed NCT04276636
Exploring the Effects of Caltrate Supplement on the Chronic Course of Crohn's Disease Patients With Vitamin D Deficiency No drug interventions treatment 0 unknown_status NCT04291313
Vitamin D in Pregnancy No drug interventions prevention Not Available unknown_status NCT02282813
Extension Study of CTAP101-CL-3001 or CTAP101-CL-3002 treatment 3 completed NCT02174718
Evaluation of a Transdermal Vitamin D3 Delivery System, D3forME No drug interventions treatment Not Available withdrawn NCT05654818
Peripheral Immunological Effects of High-dose Vitamin D Treatment in Healthy Subjects other Not Available completed NCT00748618
Vitamin D Replacement After Kidney Transplant No drug interventions treatment Not Available active_not_recruiting NCT00749918
Effect of Vitamin D Deficiency and Vitamin D Supplementation on Glucose Metabolism No drug interventions prevention Not Available completed NCT03344718
Metabolic Syndrome and Vitamin D Level in Old People No drug interventions Not Available Not Available completed NCT01068418
Vitamin D Supplementation Reduces Renin-Angiotensin System Activity in Obesity No drug interventions other Not Available completed NCT05216419
Prevention of Postoperative Hypocalcemia of Oral Vitamin D Supplementation Before Total Thyroidectomy prevention 4 recruiting NCT02906319
Vitamin D and HbA1c Levels in Diabetic Patients With CKD No drug interventions Not Available Not Available completed NCT06054919
The Effect of Vitamin D3 Therapy on Vitamin D Status in Pregnant Women With Vitamin D Deficient and Insufficient treatment 2 / 3 active_not_recruiting NCT01419119
Vitamin Deficiency in Immigrants, a Treatment Study treatment 4 completed NCT01312441
Sustainability of Vitamin D Levels After Repletion With Ergocalciferol In Chronic Kidney Disease Stage 5D treatment 4 terminated NCT03401541
25-Hydroxyvitamin D Pharmacokinetic Study treatment 0 completed NCT01339741
Efficacy of Vitamin D3 for the Treatment of Psoriatic Patients With Vitamin D Deficiency and Insufficiency No drug interventions treatment Not Available unknown_status NCT01575717
The Effect of Vitamin D Repletion in Patients With Hepatocellular Carcinoma on the Orthotopic Liver Transplant List treatment Not Available unknown_status NCT03134417
Magnesium and Vitamin D Supplementation and Cardiometabolic Outcomes No drug interventions other Not Available completed NCT01093417
Study of Vitamin D and Effect on Heart Disease and Insulin Resistance Not Available 2 completed NCT03066817
Vitamin D and Bone Homeostasis in Ortho Polytrauma Patients treatment 1 / 2 suspended NCT00915317
Effect of Vitamin D Supplementation on Erythropoietin Dosage in Hemodialysis Patients Who Have Vitamin D Deficiency No drug interventions Not Available Not Available withdrawn NCT00473317
Sunlight Exposures Effect on Serum Vitamin D Levels No drug interventions treatment Not Available completed NCT04629534
Mothers' Own Milk Optimization for Preterm Infants Project (MoMO PIP) Pilot Study prevention 4 terminated NCT02795234
Empirical Comperative Study Of Variation Blood Level Antibody Vitamin D at Different Groups Of Patients Compared Healthy Peoples No drug interventions diagnostic Not Available unknown_status NCT04389424
Relationship Between Body Composition, Food Consumption, and Micro and Macronutrients With Gene Expression in Breast Cancer Not Available Not Available unknown_status NCT01503216
Safety and Bioefficacy of Vitamin D2 and Vitamin D3 No drug interventions health_services_research Not Available completed NCT01436916
Oral Cholecalciferol in Prevention of Type 2 Diabetes Mellitus prevention 4 completed NCT05852496
Vit D and Peripheral Neuropathy in Taxane Naive Patients prevention 2 not_yet_recruiting NCT02190396
Vitamin D Deficiency and Placental Calcification in Low-risk Obstetric Population - Are They Related? No drug interventions Not Available Not Available completed NCT05506696
Vitamin D Supplementation Study No drug interventions other Not Available completed NCT05922696
Cholecalciferol Supplementation in Hemodialysis Patients treatment 2 / 3 completed NCT03890458
The Effect of Vitamin D on Fertility No drug interventions supportive_care 4 completed NCT01633658
The Variability of 25-hydroxyvitamin D Response From Crystalline 25-hydroxyvitamin D3 No drug interventions Not Available Not Available withdrawn NCT02186535
The Role of Vitamin D in Female Reproductive Tract Immunity No drug interventions Not Available 1 completed NCT03894735
Vitamin D in Ectopic Pregnancies No drug interventions Not Available Not Available completed NCT03873935
Vitamin D in Periodontal and Cardiovascular Disease Progression No drug interventions Not Available Not Available completed NCT02598635
Effects of Cholecalciferol on Osteoprotegerin Levels in Patients on Peritoneal Dialysis treatment 4 unknown_status NCT01337635
Vitamin D Deficiency and Atopic Dermatitis treatment Not Available terminated NCT02258035
Isolation of Vitamin D Binding Protein Isoforms From Human Volunteers No drug interventions Not Available Not Available active_not_recruiting NCT02214563
Cholecalciferol Supplementation for Anemia and Mineral and Bone Disorder in Hemodialysis Patients No drug interventions treatment 4 completed NCT04915963
Vitamin D Supplementation in Intensive Care Unit Patients No drug interventions supportive_care 3 completed NCT01998763
Vitamin D Intervention Trial in Healthy Chinese, Phase II No drug interventions treatment 1 completed NCT01026363
hCAP18 Levels and Vitamin D Deficiency in Chronic Kidney Disease treatment Not Available withdrawn NCT01519986
The Effect of Fat on Vitamin D Absorption No drug interventions Not Available Not Available completed NCT04377386
Efficacy of Oral Vitamin D Supplementation in Adolescents and Young Adults. No drug interventions treatment Not Available completed NCT03258086
Vitamin D in Diabetic Children No drug interventions diagnostic Not Available completed NCT05149339
Vitamin D Effect on A Disintegrin-like And Metalloprotease Thrombospondin1 Motif 13& Interleukin 6 in Leukemia treatment 1 / 2 completed NCT05630339
Magnesium and Vitamin D Combination for Post-COVID Syndrome No drug interventions treatment Not Available completed NCT01930539
Treatment of Vitamin D Deficiency in Intestinal Rehabilitation Clinic Patients With a Portable Ultraviolet B Lamp No drug interventions treatment Not Available completed NCT01639222
Human Pharmacology Trial of Calcium-vitamin D3 Tablet in Healthy Participants treatment 1 completed NCT00974922
Vitamin D Deficiency in Patients With Hypertension treatment 4 terminated NCT04898725
Effects of Vitamin D Supplementation on Depression and Inflammatory Markers No drug interventions health_services_research Not Available completed NCT05228925
GraviD-child Follow-up of the Children´s Health, Growth and Development Within the GraviD-study No drug interventions Not Available Not Available completed NCT04916925
Effect of Vitamin D Oral Supplementation in Poly Csytic Ovarian Women Resistant to Clomiphene Citrate treatment 1 / 2 unknown_status NCT02250625
Study Vitamin D in Healthy Individuals No drug interventions Not Available Not Available completed NCT01600430
Vitamin D Supplementation for Extremely Preterm Infants No drug interventions prevention 2 / 3 completed NCT03490448
The Changes of Body Composition, Glucolipid Metabolism and Bone Metabolism in Obese Children After Weight Loss No drug interventions health_services_research Not Available completed NCT05014048
Vitamin D Supplementation for the Prevention of Acute Respiratory Infections: a RCT in Young Finnish Men No drug interventions prevention Not Available completed NCT05084248
Vitamin D Deficiency in Adults Following a Major Burn Injury treatment 4 recruiting NCT04170348
Daily Vitamin D for Sickle-cell Respiratory Complications prevention 2 active_not_recruiting NCT01049048
The Effect of Vitamin D Statues on Endothelial Function No drug interventions prevention 0 completed NCT02881957
Hypovitaminosis D in Neurocritical Patients treatment 2 / 3 completed NCT04818957
Vitamin D Replacement Using Oral Thin Film (OTF) Cholecalciferol in Patients Undergoing Hematopoietic Stem Cell Transplantation No drug interventions treatment Not Available completed NCT04183257
Effect of Escalating Oral Vitamin D Replacement on HOMA-IR in Vitamin D Deficient Type 2 Diabetics treatment 4 completed NCT04469257
SUN LIGHT EXPOSURE AND VITAMIN D LEVEL IN NURSING HOME No drug interventions supportive_care Not Available completed NCT03399357
Evaluation of Metabolic Predictors of Influenza Vaccine Immune Response in the Singapore Elderly Population - the DYNAMIC Trial Not Available Not Available unknown_status NCT06176157
Vitamin D Supplementation in Pediatrics. Oral or Parenteral! D2 or D3 No drug interventions treatment 4 not_yet_recruiting NCT01506557
Vitamin D Supplementation of Lactating Mothers No drug interventions prevention 4 completed NCT06562426
Relationship Between Maternal Awareness About Vitamin D for Under- Five Years Children and Their Health Status Outcomes No drug interventions Not Available Not Available active_not_recruiting NCT04735926
Efficacy and Safety of Calcifediol vs Placebo in Subjects With Vitamin D Deficiency treatment 2 / 3 completed NCT01329666
Primary Hyperparathyroidism (PHPT): Early Effect of Vitamin D No drug interventions Not Available 2 / 3 withdrawn NCT04134065
the Effect of Vitamin D in Crohn's Disease treatment 0 unknown_status NCT01240265
Vitamin D Supplementation in Breastfeeding Women No drug interventions prevention 2 / 3 completed NCT04778865
Effect of Treatment for Vitamin D Deficiency on Thyroid Function and Autoimmunity in Hashimoto's Thyroiditis. No drug interventions supportive_care Not Available unknown_status NCT04461665
Effects of Vitamin D Supplementation on Immune Function in Infants No drug interventions treatment Not Available completed NCT04244474
Effect of Vitamin D Supplementation on Improvement of Pneumonic Children No drug interventions treatment 1 / 2 unknown_status NCT03151174
Effects of Vitamin D Supplementation on Strength, Bone Density, and Injury Risk in Collegiate Athletes prevention 0 completed NCT06098820
The Effect of UV-C Enriched Foods on Vitamin D Deficiency No drug interventions screening Not Available completed NCT02904720
Prevalence and Consequences of Vitamin D Deficiency in Pregnant Women in Switzerland No drug interventions Not Available Not Available completed NCT01058720
Efficacy of Daily Vitamin D3 Supplementation in Normal Weight Adolescents No drug interventions treatment 4 completed NCT06452082
Retrospective Observational Study on the Risk in Developing Long-COVID Syndrome and in Contracting SARS-CoV-2 Infection After COVID-19 Vaccination in Relation to Vitamin D3 Supplementation No drug interventions Not Available Not Available active_not_recruiting NCT01817231
Epidemiological Analysis of Vitamin D and Breast Cancer Risk in Saudi Arabian Women No drug interventions Not Available Not Available completed NCT05343273
25-Hydroxyvitamin D Levels in Patients With Periodontitis (Stage III) No drug interventions Not Available Not Available completed NCT04292873
Effects of Enteral Supplement Vitamin D Incritically Ill Patients No drug interventions treatment Not Available completed NCT03783273
The Influence of Food Matrix Delivery System on the Bioavailability of Vitamin D3 No drug interventions treatment Not Available completed NCT04005573
The Combined Effect of Omega-3 Fatty Acid and Vitamin D3 on Lipid Profile Levels and Oxidized Low Density Lipoprotein No drug interventions basic_science Not Available completed NCT01170273
Vitamin D in Vulnerable Adults (VIVA-VA) No drug interventions prevention 3 completed NCT01046773
Vitamin D Supplementation as Non-toxic Immunomodulation in Children With Crohn's Disease basic_science 1 terminated NCT03813927
Vitamin D Treatment of Diabetic Patients With Foot Ulcers No drug interventions basic_science Not Available completed NCT03339427
Intervention Study of Vitamin D Supplementation to Prevent Cardiovascular Disease No drug interventions other Not Available completed NCT02868827
Cholecalciferol Supplementation in Critically Ill Patients With Severe Vitamin D Deficiency. prevention 2 / 3 terminated NCT04687527
Vitamin D Levels and Postoperative Pain in Laparoscopic Cholecystectomy No drug interventions Not Available Not Available completed NCT04780776
Evaluating the Effect of Solius UV Light Source in Improving Vitamin D Status No drug interventions treatment Not Available completed NCT02803476
Is There Association Between Vitamin D Levels And Insulin Resistance In Polycystic Ovary Syndrome? No drug interventions Not Available Not Available unknown_status NCT01268176
The Effect of a Meal on Vitamin D Absorption No drug interventions basic_science 1 completed NCT06366776
Emulated Study of Vitamin D Correction vs Non-Correction No drug interventions Not Available Not Available not_yet_recruiting NCT00242476
A Study to Assess the Effectiveness of an Investigational Drug in Elderly Subjects With Low Vitamin D Levels (0822A-009) No drug interventions treatment 2 completed NCT02168660
Correction of Vitamin D Levels and Its Effect on Insulin Resistance and Weight Gain in Obese Youth treatment 2 completed NCT05276960
Efficacy of Intensive Cholecalciferol Monitoring and Supplementation on Serum vitD Levels in Pediatric Patients With CF supportive_care 4 unknown_status NCT02572960
Physiologic Interactions Between the Adrenal- and the Parathyroid Glands treatment 4 completed NCT01170494
Effect of Vitamin D Oral Supplements on 25 OH Vitamin D Levels treatment Not Available completed NCT00850694
Vitamin D Deficiency in Obese Adolescent Girls and Influence of Vitamin D on Insulin Secretion and Sensitivity No drug interventions Not Available Not Available completed NCT02138591
Therapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures. No drug interventions prevention 3 withdrawn NCT00292591
Evaluation of Vitamin D Requirements During Pregnancy prevention 3 completed NCT02661191
Vitamin D Deficiency and Asthma Exacerbation treatment Not Available completed NCT05649462
Effect of Vitamin D Supplementation on Vedolizumab Response in Patients With Ulcerative Colitis No drug interventions Not Available Not Available completed NCT02281162
The Influence of Vitamin D on Atypical Antipsychotic-induced Weight Gain No drug interventions Not Available Not Available completed NCT02460380
The Effects of Vitamin D on Angiogenic Factors in Women With Polycystic Ovary Syndrome treatment 4 completed NCT04476680
Influence of Military Preventive Policy for reCruit Training on COVID-19 Seroconversion No drug interventions prevention Not Available unknown_status NCT04637880
25- Hydroxyvitamin D Levels in Pregnancy and Effects on Pregnancy Related Disorders No drug interventions Not Available Not Available completed NCT02118129
Vitamin D Among Young Adults: an Intervention Study Using a Mobile 'App'. No drug interventions prevention Not Available completed NCT03318029
Vitamin D Supplementation and Sunlight Exposure in Brazilian Women Living in Opposite Latitudes (The D-SOL Study) No drug interventions prevention Not Available completed NCT02192229
Efficacy of the Dose Regimen of Oral Vitamin D 50,000 IU in the Treatment of Vitamin D Deficiency treatment 2 unknown_status NCT02414529
Efficacy of Vitamin D Therapy on Glucose Homeostasis in Obese Adolescents treatment Not Available completed NCT01784029
Treatment Study of Vitamin D Deficiency in Adolescents treatment 4 completed NCT05937789
Early Vitamin D3 Supplementation for Critically Ill Patients No drug interventions treatment Not Available recruiting NCT01105689
Utility of a Urine Screening Tool for Vitamin D Deficiency in Infants and Toddlers No drug interventions Not Available Not Available completed NCT03931889
Effects of Vitamin D3 Supplementation on Antioxidant Enzymes Status in Vitamin D3 Deficient Asthma COPD Overlap (ACO) Patients No drug interventions prevention Not Available unknown_status NCT01229189
Evaluation of the Effectiveness of Vitamin D Supplementation to Pregnant Women and Their Infants in Pakistan. No drug interventions health_services_research Not Available completed NCT04939792
Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans treatment 0 completed NCT02553044
Change in Free 25(OH)D After High Dose in Vitamin D Deficient Postmenopausal Women No drug interventions treatment Not Available completed NCT04386044
Investigating the Role of Vitamin D in the Morbidity of COVID-19 Patients No drug interventions Not Available Not Available completed NCT00948740
The Effect of Vitamin D on Urinary Calcium Excretion in Kidney Stone Formers With High Urinary Calcium treatment 2 / 3 withdrawn NCT00267540
The Effect of Vitamin D on Bone Accretion and Turn-Over in Young Girls No drug interventions prevention Not Available completed NCT06263140
Vitamin D Levels in Non-immediate Drug Hypersensitivity Case-control Study No drug interventions Not Available Not Available completed NCT03284840
Adults Nutrition as a Protective or Health-risk Factor No drug interventions Not Available Not Available completed NCT06282640
Comparıson Of Electromyography Results Before And After Vıtamın D Treatment In Patıents Wıth Carpal Tunnel Syndrome prevention 4 completed NCT00882401
Vitamin D, Chronic Kidney Disease (CKD) and the Microcirculation treatment 4 completed NCT01477801
Effects of Cholecalciferol Supplementation in Patients With Chronic Heart Failure and LOw vITamind D Levels treatment 2 / 3 unknown_status NCT02008201
Vitamin D Status and Supplementation in Athletes No drug interventions treatment 3 completed NCT03330301
D-tecting Disease - From Exposure to Vitamin D During Critical Periods of Life No drug interventions Not Available Not Available completed NCT01244204
Role of Vitamin D in Innate Immunity to Tuberculosis No drug interventions prevention Not Available completed NCT01141972
The Role of Vitamin D in Menopause: Relationship to Menopausal Symptoms in Body Composition No drug interventions health_services_research 1 completed NCT05502068
The Effects of a Sublingual Sprayable Microemulsion of Vitamin D on Inflammatory Markers in COVID-19 Patients No drug interventions treatment Not Available completed NCT05141968
Vitamin D Supplementation and Glycemic Control Improvement Among Type 1 Diabetic Children No drug interventions screening Not Available completed NCT05650268
Effects of Stoss Therapy of Vitamin D3 on Peri-operative Outcomes in Patients Receiving General Surgery treatment Not Available withdrawn NCT04229368
Effect of Vitamin D Status and Repletion on Postoperative Total Joint Arthroplasty Complications No drug interventions prevention Not Available recruiting NCT03871868
Vitamin D Levels And Myoma Uteri No drug interventions Not Available Not Available completed NCT02209168
Differences in Ovarian Reserve Markers and Vitamin D Between Infertile Indian, Arabian and Caucasian Population No drug interventions Not Available Not Available withdrawn NCT04918368
Vitamin D and Sleep Disorders in Pregnancy No drug interventions Not Available Not Available completed NCT02443246
A Prospective, Multi-center Study to Evaluate the Efficacy and Safety of Vitamin D3 B.O.N. Intramuscular Injection in Adults With Vitamin D Deficiency treatment 3 completed NCT03919812
Immunomodulatory Vitamin D in Thalassemia No drug interventions treatment Not Available completed NCT01240512
DAYLIGHT: Vitamin D Therapy in Individuals at High Risk of Hypertension treatment Not Available completed NCT05559112
Effects of Vitamin D-Enriched Mushrooms on Vitamin D Status and Immune Function and Inflammatory Status in Adults No drug interventions screening Not Available completed NCT03644212
Vitamin D Increases Serum Levels of the Soluble Receptor for Advanced Glycation End Products in Women With PCOS treatment 4 completed NCT04005612
Effect of Vitamin d and Omega 3 on Osteocalcin No drug interventions basic_science Not Available completed NCT03305510
Vitamin D Deficiency of Couples and Infertility No drug interventions Not Available Not Available completed NCT01325610
Vitamin D Effect on Calcium Absorption on Persons on Hemodialysis No drug interventions treatment Not Available completed NCT06114381
Physical Exercise and Diet Management in Vitamin D Deficient Females No drug interventions treatment Not Available completed NCT03471481
Magnesium as a Mediator of Bone and Vitamin D Metabolism in Patients on Antiepileptic Drug Therapy No drug interventions Not Available Not Available terminated NCT01793181
Vitamin D Levels in Patients With Central Retinal Vein Occlusion- a Prospective Controlled Study No drug interventions Not Available Not Available completed NCT04117581
A Study to Investigate the Effect of Vitamin D3 Supplementation on Asthma Symptoms in Adults With Asthma (VITDAS) No drug interventions prevention Not Available completed NCT03233295
A Prospective, Single-centre, Open-label Study to Confirm the Efficacy and Safety of Vitamin D3 B.O.N. Intramuscular Injection in Adults With Vitamin D Deficiency treatment 4 completed NCT03304795
Vitamin D Deficiency Still Growing No drug interventions Not Available Not Available completed NCT02416895
Vitamin D Status and Immune Function No drug interventions Not Available Not Available completed NCT00682214
Cholecalciferol Supplementation, Muscle Strength health_services_research 1 completed NCT01039714
Vitamin D Levels and Postoperative Hypocalcemia After Total Thyroidectomy No drug interventions Not Available Not Available unknown_status NCT02099955
Vitamin D Deficiency and Replacement on Pulmonary and Endocrine Function in SCI treatment 1 / 2 completed NCT03158155
Prevalence of Early Childhood Caries in Egyptian Children With Serum Vitamin D Deficiency. No drug interventions Not Available Not Available unknown_status NCT01694355
The Impact of Severe Vitamin D Deficiency and Its Correction on Bone Mineral Density (BMD) in Postmenopausal Women treatment Not Available completed NCT03920150
Vitamin D 24'000 IU for Oral Intermittent Supplementation treatment 3 completed NCT02404623
The Effect of Vitamin D Administration to Premature Infants on Vitamin D Status and Respiratory Morbidity No drug interventions prevention Not Available completed NCT04768023
12 Weeks Vitamin D Supplementation and Physical Activity in PD Patients With DBS supportive_care Not Available completed NCT02035423
Community Interventional Trial (CITFOMIST) No drug interventions diagnostic Not Available completed NCT01535508
Open Label Clinical Trial of Vitamin D in Children With Autism treatment 2 / 3 completed NCT01926808
Vitamin D Serum Concentrations & Supplementation in Children With Cerebral Palsy No drug interventions Not Available Not Available completed NCT01107808
Calcium, Vitamin D and Metformin to Treat Insulin Resistance in Obese African American Adolescent Females treatment Not Available withdrawn NCT01549938
Cholecalciferol Intervention to Prevent Respiratory Infections Study No drug interventions prevention 2 completed NCT05322538
Menier's Disease - Bone Density Study No drug interventions diagnostic Not Available not_yet_recruiting NCT05141838
Vitamin D Status and Bone Metabolism Status in Children With Congenital Epidermolysis Bullosa treatment 4 unknown_status NCT04840238
30000 IU Per Week Vitamin D Treatment in PCOS Patients treatment 2 completed NCT01153243
Vitamin D and Inflammatory Markers of Cardiovascular Disease in African Americans With Type 2 Diabetes treatment 4 unknown_status NCT01419743
Effect of Vitamin D Supplementation on In-vitro Fertilization (IVF) Outcomes No drug interventions Not Available Not Available terminated NCT03829943
Vitamin D and Human Sperm DNA Fragmentation No drug interventions Not Available Not Available unknown_status NCT03735303
Effect of Vitamin D3 and Omega-3FA on Leptin and HbA1C With Vitamin D Deficiency No drug interventions basic_science Not Available completed NCT00789503
Nursing-Home Residents Given Bread Fortified With Vitamin D3 No drug interventions treatment 1 / 2 completed NCT01546103
Vitamin D3 Supplementation Pilot Study No drug interventions treatment Not Available completed NCT06274203
High Dose Vitamin D Supplementation in Children With Sickle Cell Disease treatment Not Available completed NCT02922803
Vitamin D and Physical Performance Before and After Intervention and Birth Outcome in Pregnant Somali and Swedish Women prevention Not Available completed NCT02069990
Controlled, Randomized, Four-arm Comparative, Open Label, Multi-centric Clinical Trial to Compare the Efficacy and Safety Parameters of the Once-a-week or Once-a-month Administered 7000 IU, or 30000 IU Vitamin D (Cholecalciferol) to a 1000 IU Dosage Applied Daily in Vitamin D Deficient Patients treatment 3 completed NCT05066490
Effect of Exercise on Vitamin d in Obese No drug interventions treatment Not Available completed NCT03376490
Study of the Association of Muscle Strength, Balance and Other Factors With Vitamin Levels Among Elderly Diabetics No drug interventions Not Available Not Available completed NCT02024490
The Effect of Maternal and Neonatal Vitamin D Levels on Respiratory Distress Syndrome in Preterm Infants No drug interventions Not Available Not Available completed NCT01746264
Effect of Vitamin D Supplementation on Endothelial Function in Obese Adolescents No drug interventions prevention 1 completed NCT03333564
Effect of Vitamin D3 and Omega-3FA on Estradiol No drug interventions basic_science Not Available completed NCT02534064
Effect of Consumption of Yogurt Fortified in Calcium and Vit. D on Circulating Levels of 25OHD in Postmenopausal Women No drug interventions Not Available Not Available completed NCT01583621
Vitamin D Supplementation in Overweight/Obese African American Adults and Youth (D-SUNNY) No drug interventions health_services_research Not Available completed NCT01419821
Vitamin D and Its Affect on Growth Rates and Bone Mineral Density Until Age 5 treatment Not Available unknown_status NCT01797302
Vitamin D and Vascular Health in Children No drug interventions treatment Not Available completed NCT06199102
The High Initial Dose of Monitored Vitamin D Supplementation in Preterm Infants. No drug interventions prevention Not Available not_yet_recruiting NCT03483584
Incidence of HANA Conditions in HIV-infected Individuals No drug interventions Not Available Not Available recruiting NCT02210884
Maternal Vit D Supplements & Infant and Maternal Biomarkers & Outcomes in Southern Ethiopia No drug interventions basic_science Not Available completed NCT04307784
The Effects of Vitamin D3 Alone and in a Combination With Omega-3 on the Association of C-peptide With Glycemic Control No drug interventions basic_science Not Available completed NCT03639584
Prevalence of Deficiency of Vitamin D in Critically Ill Patients No drug interventions Not Available Not Available completed NCT01016184
Influence of Vitamin D Treatment on Multi-systemic Functions in Young Men With Vitamin D Deficiency Due to Work Conditions No drug interventions treatment 4 completed NCT03035084
Is Vitamin D2 Treatment-associated Decrease in 25(OH)D3 Level a Reciprocal Phenomena? basic_science 4 completed NCT02389179
Determination of Vitamin D Dose to Maintain Sufficiency Amongst Indian and Malay Women in the Tropics treatment 4 unknown_status NCT03349879
Familial Clustering of Vitamin D Deficiency Via Shared Environment: The Korean National Health And Nutrition Examination Survey 2008-2012 No drug interventions Not Available Not Available completed NCT00092079
A Study of MK0217A and Dietary Supplement in Men and Postmenopausal Women With Osteoporosis (0217A-227) treatment 3 completed NCT01295879
Vitamin D Repletion in Stone Formers With Hypercalciuria treatment 4 completed NCT00886379
Blue Sky Study: Impact of Milk and Vitamin D for Child Growth and Health No drug interventions prevention 2 completed NCT02594579
Effect of Vitamin D3 Supplementation on Muscle Mass in ICU Patient treatment 3 unknown_status NCT00957879
Different Vitamin D Preparations & FGF23 in Humans No drug interventions Not Available Not Available completed NCT01704079
Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency treatment 3 completed NCT02293187
Impact of Vitamin D on 25-hydroxyvitamin D Levels and Physical Function No drug interventions basic_science Not Available completed NCT02451787
The 'Hidden' Biological Impact of Vitamin D Deficiency: a Biomarker Study; Part 2 No drug interventions basic_science 2 completed NCT01325987
African American Children, Glycemic Control, and Type 2 Diabetes No drug interventions treatment Not Available completed NCT04291833
Prospective, Assessment of Vitamin D and Calcium Supplementation, Improvement of Nutritional Status and Preoperative Rehabilitation in Patients Before Knee Arthroplasty. No drug interventions prevention Not Available completed NCT01490333
Sunweavers: Supporting Native American Women's Vitamin D Research No drug interventions prevention 2 completed NCT03472833
High-dose Vitamin D3 in Pancreas Cancer No drug interventions supportive_care 3 terminated NCT01991054
The Effects of Vitamin D Supplementation on Patients With Type 2 Diabetes and Vitamin D Deficiency No drug interventions treatment 4 completed NCT01004354
Vitamin D Supplementation in Psychiatric Illnesses treatment Not Available completed NCT06452251
Vitamin-D Insufficiency and Implants No drug interventions Not Available Not Available completed NCT00893451
Study of Vitamin D3 Supplementation in Patients With Chronic Kidney Disease treatment Not Available completed NCT05650151
Peri-operative Vitamin D Therapy for Hepatectomy No drug interventions treatment Not Available not_yet_recruiting NCT01399151
Assessment of Vitamin D Supplementation and Immune Function No drug interventions basic_science Not Available completed NCT03342651
Preoperative Vitamin D Levels and Respiratory Complications of General Anesthesia No drug interventions diagnostic Not Available completed NCT01633853
Efficacy of Vitamin D2 to Treat Chronic Kidney Disease Mineral and Bone Disorder treatment 4 completed NCT04038853
Vitamin D in Fatty Liver Disease treatment 4 completed NCT05916053
Supplementation and Depressive Symptomatology Incidence Among Saudi Arabian Adults No drug interventions prevention Not Available completed NCT04324853
Helminth Infection During Pregnancy on Vitamin D Regulation: HELMVIT Study No drug interventions Not Available Not Available completed NCT01024777
Safety and Immunologic Effect of Low Dose Versus High Dose Vitamin D3 in Multiple Sclerosis treatment 1 completed NCT04945577
The Relationship Between Vitamin D Levels, Inflammatory Parameters and Disease Severity of COVID-19 Infection No drug interventions Not Available Not Available completed NCT05434377
A Study of Fixed Dose Versus Serum Level-Based Titration Regimen of Vitamin D Supplementation in Dialysis Patients No drug interventions treatment Not Available completed NCT06067477
Estimation of the Dietary Requirement for Vitamin D in Ethnic Groups No drug interventions prevention Not Available recruiting NCT01838447
Prevention of Vitamin D Deficiency Following Pediatric CHD Surgery: a Phase II Dose Evaluation Randomized Controlled Trial Comparing Usual Care With a High Dose Pre-operative Supplementation Regimen Based on the Institute of Medicine Daily Upper Tolerable Intake Level No drug interventions prevention 2 completed NCT00780247
Environmental Influences on Vitamin D Status No drug interventions Not Available Not Available completed NCT03403647
Effect of Vitamin D on Everolimus Trough Concentrations Among Heart Transplanted Patients No drug interventions treatment Not Available completed NCT00327847
Optimizing Vitamin D Nutrition in Healthy Adults treatment Not Available completed NCT01672047
Effect of Vitamin D Supplementation on Coronary Calcification and Parathyroid Hormone in CKD Patients treatment Not Available unknown_status NCT03991845
A Trial to Evaluate the Effect of Vitamin D Supplementation in Patients With Chronic Urticaria treatment 4 unknown_status NCT01807845
Bioavailability of Vitamin D Encapsulated in Casein Micelles, Compared to Its Bioavailability in a Synthetic Emulsifier Currently Used for Supplementation and Enrichment. No drug interventions prevention Not Available unknown_status NCT01508845
A Pilot Study of the Effect of Dietary Fat Type and Amount on Vitamin D3 Absorption No drug interventions treatment Not Available completed NCT05459298
ViDES Trial (Vitamin D Extra Supplementation) No drug interventions other Not Available recruiting NCT05009498
Vitamin D3 Supplementation for Vitamin D Deficiency in Rotator Cuff Repair Surgery No drug interventions treatment Not Available unknown_status NCT01385098
Efficacy of Vitamin D Supplementation in Bariatric Surgery Patients No drug interventions treatment Not Available completed NCT00882505
Comparison of 25-hydroxy Vitamin D Level in Caucasian Women Receiving Vitamin D Supplementation and Not Receiving Supplementation: a Randomized Controlled Trial. No drug interventions treatment Not Available completed NCT06412705
Vit D and Post-extractive Bone Turnover No drug interventions treatment Not Available completed NCT03782805
Effect of Vitamin D Supplementation on Inflammatory Markers No drug interventions treatment Not Available completed NCT06033105
Vitamin D Deficiency as a Risk Factor for the Development and Malignant Transformation of Oral Lichen Planus No drug interventions Not Available Not Available completed NCT02485197
Muscle Metabolic Function in Older Adults With Different Vitamin D Status Before and After Exercise No drug interventions screening Not Available completed NCT05824897
The Cohort Study of the Correlation Between Serum 25(OH)D Level and Pregnancy Outcome No drug interventions Not Available Not Available recruiting NCT01190683
Vitamin D and Muscle Strength and Surface (Electromyography) EMG health_services_research 3 completed NCT05221983
COVID-19 and Vitamin D: Length of Hospital Stay and Mortality No drug interventions Not Available Not Available completed NCT01397383
Vitamin D and Functional Outcomes After Total Hip Arthroplasty (THA) No drug interventions Not Available Not Available completed NCT03810261
Challenges in Achieving Adequate Vitamin D Status in the Adult Population/ Part 2 No drug interventions treatment Not Available completed NCT02714361
A Study to Investigate the Effect of Vitamin D3 Supplementation on Iron Status in Iron Deficient Women No drug interventions prevention Not Available completed NCT01754961
Effects of Vitamin D on Inflammation in Liver Disease treatment 2 unknown_status NCT03144128
Vitamin D for Muscle Metabolic Function in Cancer Cachexia No drug interventions supportive_care Not Available completed NCT01443728
Vitamin D for Sickle-cell Respiratory Complications treatment 2 completed NCT05329428
PREDIN: Pregnancy and Vitamin D Intervention Study No drug interventions treatment Not Available active_not_recruiting NCT00581828
Does Treatment of Hypovitaminosis D Increase Calcium Absorption? treatment 4 completed NCT03032328
Vitamin D Deficiency and Dysautonomia No drug interventions treatment Not Available completed NCT05543928
Phase 3 Safety and Efficacy Study of CTAP101 Extended-release Capsules in Children With Secondary Hyperparathyroidism treatment 3 terminated NCT02460211
Acute Effect of Systemic Stress on Measured Blood Concentrations of 25 (OH) Vitamin D No drug interventions treatment Not Available completed NCT00273611
Vitamin D Levels and Vitamin D Education in Geriatric Patients No drug interventions Not Available Not Available completed NCT04891211
Retinal Changes in Vitamin D Deficiency No drug interventions prevention Not Available completed NCT02750293
The Effect of Vitamin D Supplementation on Cardiovascular Risk Factors treatment 3 completed NCT01430793
Determination of Effective Vitamin D Replacement and Monitoring Strategies in Vitamin D Deficiency State treatment Not Available completed NCT03141593
Oral Vitamin D Substitution Weekly or Monthly and Adherence treatment 4 completed NCT02435771
Efficacy Of Ergocalciferol In Adults According To BMI No drug interventions treatment 4 terminated NCT03544671
Effect of Vitamin D3 Supplementation in Children From 12 to 30 Months of Age. No drug interventions prevention Not Available completed NCT02136771
Styrian Vitamin D Hypertension Trial No drug interventions treatment 4 completed NCT00685971
Cholecalciferol for Vitamin D in Adult Cystic Fibrosis (CF) Patients No drug interventions treatment Not Available completed NCT03395171
Vitamin D3 Supplementation and Stress Fracture Occurrence in High-Risk Collegiate Athletes No drug interventions treatment Not Available completed NCT01119378
Study to Observe the Capability to Absorb Calcium as an Measure of Adequate Levels of Vitamin D No drug interventions diagnostic Not Available completed NCT03420378
Central Sensitization in Vitamin D Deficiency No drug interventions screening Not Available completed NCT03989778
Vitamin D and Polycystic Ovarian Syndrome (PCOS) treatment 2 recruiting NCT03148288
Vitamin D Supplementation in IBS No drug interventions other Not Available terminated NCT01634607
Bone Health and Vitamin D Status No drug interventions Not Available Not Available completed NCT03310307
Vitamin D3 Treatment and Homocysteine Concentrations Among Overweight Reproductive Women No drug interventions treatment 2 completed NCT03405207
Vitamin D Deficiency Treatment Outcomes After Non-ST-Segment Elevation Myocardial Infarction treatment 2 unknown_status NCT05394207
Evaluation Of The Effect Of L. Casei DG® On Vitamin D Absorption In Patients Under Vitamin D Supplementation. No drug interventions treatment Not Available unknown_status NCT01234909
Asthma, Missed Immunizations, and Vitamin D Deficiency in Atopic Dermatitis No drug interventions Not Available Not Available terminated NCT03270709
Effect of High-Dose Vitamin D3 in Smokers and Non-Smokers With and Without HIV treatment 1 terminated NCT02713009
Impact of Maternal Body Weight on Vitamin D Status During Pregnancy No drug interventions basic_science Not Available completed NCT03584256
Vitamin D Status Among Competitive Female Gymnast and Swimmers After Winter Time No drug interventions Not Available Not Available completed NCT02477956
Effect of a Monthly High Dose of Vitamin D3 on Bariatric Surgery Patients No drug interventions treatment 1 completed NCT00723385
Effects of Vitamin D on Lipids No drug interventions Not Available Not Available completed NCT01385085
Impact of Work Environment Absent of Natural Light on Vitamin D Levels No drug interventions Not Available Not Available unknown_status NCT01721915
Vitamin D Treatment, Pharmacogenetics and Glucose Metabolism treatment 4 completed NCT01512537
Alternative Treatments of Vitamin D Deficiency No drug interventions basic_science Not Available completed NCT01815437
Evaluating Vitamin D Content in Mushrooms No drug interventions other Not Available completed NCT06473337
Vitamin D Deficiency as Independent Predictor for Plaque Vulnerability No drug interventions Not Available Not Available completed NCT00640237
Interventional Trial of Vitamin D Deficiency in the Patients of General Departments No drug interventions treatment 3 unknown_status NCT00427037
Cholecalciferol (Vitamin D3) Therapy in Chronic Kidney Disease (CKD) Subjects treatment Not Available completed NCT03638037
Correlation Between Maternal Vitamin D Level And Preterm Birth No drug interventions Not Available Not Available unknown_status NCT03018132
Preeclampsia Research on Vitamin D, Inflammation, & Depression No drug interventions screening Not Available active_not_recruiting NCT04865432
Solius UV Light Source in Improving Serum Levels of 25-hydroxyvitamin D No drug interventions treatment Not Available completed NCT05430932
Effect Of Laparoscopic Sleeve Gastrectomy on Vitamin D, Parathormone and Calcium Levels No drug interventions treatment Not Available completed NCT06315452
FREQUENCY OF VITAMIN D DEFICIENCY IN PREMATURE NEWBORN BORN BEFORE 32 WEEKS AND/OR WITH A BIRTH WEIGHT UNDER 1500g No drug interventions Not Available Not Available active_not_recruiting NCT02212652
Vitamin D to Improve Nutrition Prior to Bariatric Surgery and Investigate the Relationship With Negative Outcomes No drug interventions treatment Not Available terminated NCT04628000
Baseline Vitamin D Deficiency and COVID-19 Disease Severity No drug interventions Not Available Not Available completed NCT01651000
Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency treatment 3 completed NCT04621500
Vitamin D Supplementation in RNA-seq Profiles of Single-core Prostate Samples, Among Veterans basic_science 2 completed NCT02735200
Topical Delivery of Vitamin D3 as Vitamin D Supplementation treatment 2 completed NCT00497900
The Effect of Calcium and Vitamin D in Patients With Heart Failure treatment 4 completed NCT02381600
An Evaluation of the Effect of Vitamin D Supplementation on the Cognitive Function of Older Subjects With Low Levels of This Vitamin treatment Not Available terminated NCT06338059
Relationship Between Vitamin D and Vitamin B12 Levels and Neuropathic Pain in Lipedema No drug interventions Not Available Not Available active_not_recruiting NCT02022475
Effect of Vitamin D Treatment on Fatigue treatment 3 completed NCT04179370
Vitamin D and Health Status of British African-Caribbean Women No drug interventions Not Available Not Available unknown_status NCT05860270
Oral Vitamin D Supplementation Prevent Peritoneal Dialysis-related Peritonitis prevention 4 recruiting NCT01636570
Vitamin D3 Supplementation for Heart Failure Patients treatment 2 completed NCT05591170
Effect of Single High Dose of Cholecalciferol on Serum Metabolites of Vitamin D diagnostic 4 completed NCT05517070
Vitamin D Deficiency and Body Composition in the Patients With Hemophilia No drug interventions Not Available Not Available completed NCT05104970
Comparative Pharmacokinetics of Two Different Oral Delivery Systems of Cholecalciferol No drug interventions treatment 2 unknown_status NCT01596842
Effect of Omega-3 Fatty Acid on Vitamin D Activation treatment 4 completed NCT01845142
Immunologic Action of a Single Dose Cholecalciferol basic_science 4 completed NCT01170442
Does Vitamin D Improve Glycemic Control in Type II DM? treatment 3 terminated NCT05656742
Effects of Vitamin D on Cardiovascular Health in Black Women No drug interventions prevention Not Available recruiting NCT04066842
Vitamin D in Systemic Sclerosis Patients With Periodontitis No drug interventions Not Available Not Available completed NCT03463642
The Efficacy of Different Vitamin D Supplementation Delivery Methods No drug interventions treatment Not Available completed NCT01817699
Correcting Anemia and Native Vitamin D Supplementation in Kidney Transplant Recipients No drug interventions treatment 4 terminated NCT05997199
The Effect Vitamin D on the Recovery Rate of Bell Palsy No drug interventions Not Available Not Available active_not_recruiting NCT01250899
Vitamin D in HIV-Infected Patients on HAART No drug interventions treatment Not Available completed NCT00469599
Treatment of Secondary Hyperparathyroidism in the Uremic Patient treatment Not Available terminated NCT05661006
ETOL-Elderly Study of the Efficiency of the Innovative Food Supplement in Elderly Adults No drug interventions treatment Not Available completed NCT01090206
Correlation Between Vitamin D Status and Bone Mineral Density in Patients With Hemophilia No drug interventions screening Not Available completed NCT01118806
Vitamin D Levels in Residents in Medicine No drug interventions Not Available Not Available completed NCT03176849
A Randomized Phase IV Control Trial of Single High Dose Oral Vitamin D3 in Pediatric Patients Undergoing HSCT No drug interventions treatment 4 completed NCT05863949
Clinical Trial of Vit D and Calcium for Recurrent BPPV No drug interventions treatment Not Available not_yet_recruiting NCT05568836
Relationship Between Serum Vitamin D and Outcomes of Liver Transplantation in Cirrhotic Patients Undergoing Liver Transplantation and Effects of Vitamin D Supplementation in Post-transplant Period No drug interventions treatment 1 / 2 not_yet_recruiting NCT01848236
Effects of Vitamin D Insufficiency in Man No drug interventions treatment Not Available completed NCT04939636
Vitamin D Supplementation in Estonian Conscripts No drug interventions prevention Not Available completed NCT01817036
Vitamin D Intervention Trial in Healthy Chinese No drug interventions treatment 1 completed NCT02135913
Roles of Vitamin D and HDL in Obese Children No drug interventions diagnostic Not Available completed NCT00762918
Vitamin D3 for the Treatment of Low Vitamin D in Cystic Fibrosis No drug interventions treatment 3 withdrawn NCT05389618
Dietary Challenges in the Population of Nursing Homes' Residents No drug interventions Not Available Not Available enrolling_by_invitation NCT03234218
Vitamin D Levels in Liver Transplantation Recipients Prospective Observational Study No drug interventions Not Available Not Available completed NCT02091219
Effects of Vitamin D3 Versus 25OHD3 on Mineral Metabolism and Immune Function prevention 0 completed NCT00204919
Vitamin D Administration in the Nursing Home treatment Not Available completed NCT04986319
Reference Interval of Vitamin D of Coastal Fishermen in Cox's Bazar District of Bangladesh No drug interventions Not Available Not Available completed NCT00749541
Vitamin d Levels and Coronary Catheterization No drug interventions Not Available Not Available completed NCT06203041
Vitamin D Sulfates in Breastmilk No drug interventions basic_science Not Available recruiting NCT04405141
Uroflowmetry Results and Vitamin D Levels No drug interventions Not Available Not Available completed NCT04606017
Effect of Vitamin D Supplementation on Infliximab Response in Patients With Crohn's Disease No drug interventions Not Available Not Available completed NCT00690417
Vitamin D Inadequacy in Rural Populations, Evaluation of Correction by Food Supplementation No drug interventions treatment Not Available completed NCT02930434
Effects of Antarctic Environment on Vitamin D Status and Health Risk Biomarkers of Its Inhabitants No drug interventions treatment Not Available completed NCT01488734
Bioavailability and Biological Effects of Vitamin D2 Contained in Mushroom No drug interventions treatment Not Available completed NCT05981534
The Effectiveness of Vitamin D Supplementation in Patients With End-stage Knee Osteoarthritis treatment Not Available recruiting NCT01477034
Vitamin D and Adipose Tissue Inflammation No drug interventions basic_science Not Available completed NCT04935034
Absorption Kinetics and Efficacy of Vitamin D Enriched Supplements in Older Adults. No drug interventions prevention Not Available completed NCT02783924
The GLOBAL Vitamin D Study. A Genomic, Transcriptomic, Proteomic and Metabolomic Approach basic_science 2 completed NCT04359524
Vitamin D Supplementation in Conscripts No drug interventions prevention Not Available completed NCT02704624
Effects of Supplementation of Vitamin D in Patients With Crohn's Disease No drug interventions treatment 4 unknown_status NCT01741324
Comparing Different Amounts of Vitamin D Supplementation to Preschool Children Living in Northern and Southern Sweden No drug interventions prevention Not Available completed NCT03232216
Vitamin D Supplementation and Tibia Fracture. Does it Improve Healing Rate? No drug interventions prevention Not Available unknown_status NCT05050916
The Investigation of Vitamin D and Menstrual Cycles Trial, the inVitD Trial: A Phase II Randomized Trial No drug interventions basic_science 1 / 2 completed NCT04677816
Impact of Vitamin D Supplementation on the Rate of Pathologic Complete Response in Vitamin D Deficient Patients No drug interventions treatment 2 recruiting NCT05724316
Effects of Vitamin D on the Behaviours, Mental, and Physical Health of Prisoners No drug interventions treatment Not Available recruiting NCT03613116
High-dose Vitamin D Supplements in Older Adults No drug interventions treatment 2 active_not_recruiting NCT01548716
A Study of 25-hydroxy Vitamin d Levels in Non-itching Hemodialysis Patients No drug interventions Not Available Not Available completed NCT03038516
'Palliative-D' Vitamin D to Palliative Cancer Patients treatment 2 completed NCT06204796
The Role of Vitamin D in Amelioration of Oral Lichen Planus and Its Effect on Salivary IFN-γ Level treatment 4 completed NCT03188796
The VITDALIZE Study: Effect of High-dose Vitamin D3 on 28-day Mortality in Adult Critically Ill Patients treatment 3 recruiting NCT01437696
How Much Vitamin D is Required to be Protective Against Deficiency During the Winter Months? No drug interventions treatment 4 completed NCT00851396
Assessment of Influence of Vitamin D on Insulin Secretion and Sensitivity in Obese Teenage Girls No drug interventions Not Available Not Available completed NCT04033796
Vitamin D Supplementation D_SAF Pilot Study No drug interventions prevention Not Available completed NCT04309058
Observation of the Effect of Vitamin D Supplementation on Chronic Course of Patients With Ulcerative Colitis Based on Vitamin D Receptor Fok I Gene Polymorphism treatment 0 unknown_status NCT06002035
Study on Clinical Value of Vitamin D in Recurrent Spontaneous Abortion No drug interventions Not Available Not Available completed NCT00742235
hCAP18 Levels and Vitamin D Deficiency in Healthy Subjects treatment Not Available completed NCT02551835
Vitamin D Supplements on Markers for Cardiovascular Disease and Diabetes: an Individual Participant Data Meta-analysis No drug interventions Not Available Not Available unknown_status NCT01909063
A Randomized Controlled Trial Testing The Effect Of A Multi-Nutrient Fortified Juice No drug interventions treatment Not Available completed NCT03213886
The Effect of Supplementation of Vitamin D Deficiency in Older People With Acute Hip Fracture: treatment 4 completed NCT04407286
Vitamin D Testing and Treatment for COVID 19 No drug interventions treatment 1 completed NCT04331639
High Dose Interval Vitamin D Supplementation in Patients With Inflammatory Bowel Disease Receiving Biologic Therapy No drug interventions Not Available Not Available recruiting NCT05398939
Impact of COVID-19 Vaccination on Serum 25-hydroxyvitamin D Level No drug interventions Not Available Not Available completed NCT00473239
The Pharmacokinetics of a Single Large Dose of Vitamin D3 treatment Not Available completed NCT02506439
Nutritional Requirements for Vitamin D in Pregnant Women No drug interventions prevention Not Available completed NCT05449522
Vitamin D for Critically Traumatic Patients No drug interventions treatment Not Available recruiting NCT01705522
Multimodal Approach in IBD Patients No drug interventions Not Available Not Available unknown_status NCT00921622
Vitamin Deficiency and Blood Pressure in Hospitalized Jewish General Hospital (JGH) Patients No drug interventions treatment 2 completed NCT02876822
High Dose Vitamin D Replacement in Patients Undergoing Hematopoietic Stem Cell Transplantation No drug interventions treatment Not Available terminated NCT00491322
Vitamin D Deficiency, Insulin Resistance and FGF-23 No drug interventions treatment Not Available completed NCT03273725
Maternal Vitamin D Levels in Pregnancy and Dental Caries in Children No drug interventions Not Available Not Available completed NCT06450925
Vitamin A Supplementation in Allogeneic Stem Cell Transplantation. prevention 2 not_yet_recruiting NCT03264625
The Effects of Oral Vitamin D Supplementation on the Prevention of Peritoneal Dialysis-related Peritonitis prevention 2 completed NCT00552630
Penicillamine Chelation for Children With Lead Poisoning No drug interventions treatment 2 / 3 withdrawn NCT01413230
Vitamin D Supplementation in Systemic Lupus Erythematosus Not Available Not Available completed NCT03602430
Cholecalciferol on Hemodialysis Patients treatment 2 / 3 completed NCT02009748
Vitamin D Supplementation in Cirrhotic Patients No drug interventions treatment 2 completed NCT02337257
Periodontal and Cardiometabolic Responses to Vitamin D Intervention in African Americans With Periodontal Disease prevention 0 unknown_status NCT04100226
Vitamin D Deficiency and Effect of Its Supplementation on Interstitial Lung Diseases(ILD). No drug interventions other Not Available unknown_status NCT01696526
Bioefficiency of of Conventional Fish and Vitamin D Fortified Fish No drug interventions health_services_research Not Available completed NCT02483026
Nutritional Deficiencies Preventive Treatment Prior to Laparoscopic Sleeve Gastrectomy No drug interventions supportive_care Not Available completed NCT00092066
A Study to Evaluate the Safety, Tolerability, and Efficacy of an Investigational Drug and Dietary Supplement in Men and Postmenopausal Women With Osteoporosis (0217A-227) treatment 3 completed NCT06111066
Vitamin D Levels in Neonatal Umbilical Cord Blood: Factors and Prognostic Analysis No drug interventions Not Available Not Available not_yet_recruiting NCT00996866
Vitamin D Supplementation Requirement in Obese Subjects treatment Not Available terminated NCT04482465
Omega 3 and Vitamin D Dosage in a Population With Moderate to High Risk of AMD No drug interventions prevention Not Available completed NCT01166165
Effect of Vitamin D Replacement During Winter Months in Patients With Hypertension treatment 2 completed NCT04979065
Nutrition, Immunity, and Covid-19 in Obese People No drug interventions prevention 2 completed NCT03534674
Vitamin D3 Supplementation for AlloHSCT-RCT No drug interventions prevention Not Available unknown_status NCT05384574
Vitamin D Supplementation and Clinical Outcomes in Severe COVID-19 Patients No drug interventions supportive_care Not Available unknown_status NCT04156074
Innovative Food Structures to Enhance Nutrient Bioavailability No drug interventions prevention Not Available completed NCT02676674
Vitamin D Levels Following Topical Application of Vitamin D Ointment treatment 1 completed NCT00743574
Health Benefits of Vitamin D and Calcium in Women With PCOS (Polycystic Ovarian Syndrome) treatment Not Available completed NCT00412074
Establishing the Vitamin D Requirements During Lactation treatment 3 completed NCT01292720
Vitamin D Supplementation in Chronic Stable Heart Failure treatment 3 completed NCT04525820
High Dose Vitamin-D Substitution in Patients With COVID-19: a Randomized Controlled, Multi Center Study treatment Not Available completed NCT03019120
Vitamin D Supplementation and Neurocognition treatment 2 withdrawn NCT05431920
Effects of Vitamin D Supplementation in Adolescents With Asthma, Obesity and Vitamin D Deficiency. No drug interventions treatment Not Available recruiting NCT02301520
Vitamin D, Iodine, and Lead Levels in Haitian Infants and Children. No drug interventions Not Available Not Available completed NCT02621320
Vitamin D Supplementation in Wheelchair Indoor Athletes No drug interventions treatment Not Available completed NCT00692120
Clinical Approaches to Correcting Vitamin D Inadequacy and Maintaining Adequacy No drug interventions treatment Not Available completed NCT03073720
Follicular Fluid, Bioavailable Vitamin D and Embryo Quality Markers No drug interventions Not Available Not Available completed NCT04030182
Vitamin D Deficit in Women With Uterine Fibroids No drug interventions Not Available Not Available completed NCT03203382
Corneal Nerve Structure in Sjogren's No drug interventions Not Available Not Available completed NCT03718182
Can Vitamin D Supplementation in People With Crohn's Disease Improve Symptoms as an Adjunct Therapy? No drug interventions treatment 4 unknown_status NCT04209231
Effect of Vitamin D on Periodontal Disease No drug interventions Not Available Not Available completed NCT05408273
Vitamin D and Microvascular Function in Postmenopausal Women No drug interventions Not Available Not Available completed NCT05659173
Vitamin D Deficiency With Selected Vitamin D Receptor Gene Polymorphism in Gestational Hypertension No drug interventions Not Available Not Available recruiting NCT04482673
Vitamin D Supplementation in the Prevention and Mitigation of COVID-19 Infection prevention 4 active_not_recruiting NCT03356873
Impact of Correction of Vitamin D Deficiency in Oxidative Stress in Patients With Prediabetes (VICOX) treatment Not Available terminated NCT05419973
Vitamin D Levels in Umbilical Cord and It's Impact on Infant and Children's Health (VITADi Study) No drug interventions Not Available Not Available unknown_status NCT00288873
Characterization of Hyperparathyroidism and Vitamin D Deficiency in Obesity treatment 4 completed NCT01349127
Trial to Assess Vitamin D Requirements in Lactating Women No drug interventions prevention Not Available completed NCT04694976
Vitamin D Status in Children With Sickle Cell Disease Living in Lyon, France Not Available Not Available completed NCT04738760
Clinical Outcomes of High Dose Vitamin D Versus Standard Dose in COVID-19 Egyptian Patients No drug interventions Not Available Not Available completed NCT03063060
The Impact of Vitamin D Deficiency on Hypocalcaemia Following Total Thyroidectomy No drug interventions Not Available Not Available unknown_status NCT00697294
Impact of Vitamin D Status on Bones in Breastfed Infants No drug interventions diagnostic Not Available completed NCT06096194
Vitamin D3-enhanced Eggs in Preschool Children No drug interventions treatment Not Available completed NCT04207294
Vitamin D Enriched Meat Project (Acute Study) No drug interventions basic_science Not Available completed NCT04412694
The Effect of Preoperative Oral Dexamethasone Supplementation on the Outcome of Thyroidectomised Patients. prevention 4 unknown_status NCT02662491
Effects of Vitamin D and Calcium Supplementation on Health and Well-being of Vitamin D Deficient UAE Citizens No drug interventions treatment Not Available completed NCT01112891
Vitamin D in Pregnancy and Lactation prevention 4 completed NCT03380091
Metformin, Vitamin D, and Depression in Polycystic Ovary Syndrome (PCOS) Trial treatment 4 terminated NCT01354262
Effect of Vitamin D Supplementation on Hemoglobin A1c No drug interventions treatment 2 completed NCT03348280
Vitamin D and Immune Mechanisms of Hypertension in Type 2 Diabetics No drug interventions Not Available Not Available recruiting NCT03584529
Association Between Vitamin D and the Development of Uterine Fibroids treatment Not Available unknown_status NCT02631629
Food-based Solutions for Optimal Vitamin D Nutrition and Health No drug interventions prevention Not Available completed NCT03021629
Comparison of Vitamin D Status and Vitamin D Receptor Polymorphisms in Patients With High Myopia and Primary Open-angle Glaucoma No drug interventions Not Available Not Available completed NCT05073029
Open Label Randomized Clinical Study to Promote a Healthy Lifestyle in Medical Students No drug interventions prevention Not Available completed NCT01395589
Rapid vs Maintenance Vitamin D Supplementation in Deficient Children With Asthma to Prevent Exacerbations. treatment 1 completed NCT04319289
Effect of Aerobic Interval Training With Vitamin D Supplement on Functional Capacity and Perceived Myalgia treatment Not Available completed NCT05694689
Randomized Trial of Enteral Vitamin D Supplementation in Infants < 28 Weeks Gestational Age or <1000 Grams Birth Weight No drug interventions other Not Available recruiting NCT01910792
Ultraviolet Light And Vitamin D In Subjects With Fat Malabsorption Or After Gastric Bypass Surgery No drug interventions other Not Available completed NCT02234544
Effect of an Inhibitor of Cholesterol Absorption on Vitamin D Levels basic_science 4 completed NCT04652544
Vitamin D Supplementation in Individuals With a Chronic Spinal Cord Injury treatment 3 completed NCT00933244
Treatment of Vitamin D Insufficiency No drug interventions treatment 4 completed NCT01553344
Serum Sclerostin Level & Treatment of Vitamin D Deficiency No drug interventions Not Available Not Available completed NCT03193944
Vitamin D Supplementation on Metabolic Syndrome Indicators Among Older Adults, Alborz Province, Iran treatment 2 completed NCT03734744
PK/PD of Vitamin D3 in Adults With CF No drug interventions treatment Not Available terminated NCT02589444
Vitamin D and Microbiota in Cystic Fibrosis No drug interventions supportive_care Not Available completed NCT01317940
Nutrition and Body Composition in Acute Lymphoblastic Leukemia No drug interventions supportive_care 2 completed NCT01037140
Effects of Vitamin D Supplementation in Obesity treatment 4 completed NCT04363840
The LEAD COVID-19 Trial: Low-risk, Early Aspirin and Vitamin D to Reduce COVID-19 Hospitalizations treatment 2 withdrawn NCT05364567
Synergistic Effect of Vitamin D Supplementation in Patients With Vitiligo and Vitamin D Deficiency treatment Not Available completed NCT01363167
Identifying Vitamin D Deficiency in Very Low Birth Weight Infant (VLBW) Infants Part 2 No drug interventions treatment Not Available completed NCT00752401
Vitamin D3 Substitution in Vitamin D Deficient Kidney Transplant Recipients treatment 3 unknown_status NCT01971801
Vitamin D Supplementation in Older Adults With Urinary Incontinence No drug interventions treatment Not Available completed NCT03876704
Effects of Fat-soluble Vitamins Supplementation on Common Complications and Neural Development in Very Low Birth Weight Infants No drug interventions treatment 3 unknown_status NCT05950204
Effect of Supplementation With ω-3 Fatty Acids, Vitamin D and Calcium in Patients With Acute Lymphoblastic Leukemia. No drug interventions supportive_care Not Available recruiting NCT04204304
Relationship Between Serum Vitamin D Levels and Musculoskeletal Adverse Effects in Patients Using Isotretinoin screening Not Available completed NCT00494104
Prevention of Vitamin D Deficiency No drug interventions prevention Not Available completed NCT05795504
Resistive Exercise Versus HIIT on Calcium and Vitamin D No drug interventions prevention Not Available enrolling_by_invitation NCT01328704
Evaluate the Change in Iron, Vitamin D, and C-Reactive Protein Level (CRP) in a 12 to 24 Week Period No drug interventions Not Available Not Available completed NCT03221972
Vitamin D of Chinese Children and Adolescents No drug interventions Not Available Not Available completed NCT01990872
Inter-relationship Between Vitamin D Requirements and Calcium Intake in Older Adults No drug interventions prevention Not Available completed NCT04355572
Evaluation of the Clinical and Psychological Impact of Vitamin D Replacement in Adolescent Females at Risk for Polycystic Ovarian Syndrome (PCOS) treatment Not Available not_yet_recruiting NCT04407572
Evaluation of the Relationship Between Zinc Vitamin D and b12 Levels in the Covid-19 Positive Pregnant Women No drug interventions Not Available Not Available completed NCT03986268
Vitamin D Can Increase Pathological Response of the Breast Cancer Patients Treated With Neoadjuvant Therapy treatment Not Available completed NCT02362269
Personalized Vitamin D Supplementation in European and African Americans No drug interventions treatment Not Available completed NCT02187146
The Effects of Serum Vitamin D and IVF Outcome No drug interventions Not Available Not Available completed NCT01180946
Vitamin D Deficiency in Adolescent Girls No drug interventions basic_science Not Available completed NCT03496246
Vitamin D Status in Inflammatory Bowel Disease No drug interventions diagnostic Not Available unknown_status NCT04944212
Prevalence of Vitamin D Deficiency in Pregnant Women and Their Fetus in North Jordan No drug interventions Not Available Not Available completed NCT05106712
Vitamin D Supplementation and Improvement of PCOS Therapy and IVF Outcomes in Infertile Saudi Women treatment Not Available unknown_status NCT01655810
Vitamin D, Cardiovascular Disease, and African Americans No drug interventions treatment Not Available completed NCT01924910
A Single Wintertime Dose of Vitamin D3 to Prevent Winter Decline in Vitamin D Status in Healthy Adults No drug interventions treatment 4 completed NCT02208310
Trial of High Dose Vitamin D in Patient's With Crohn's Disease treatment 4 terminated NCT00306410
The Prevalence of Vitamin D Deficiency and Effects of Vitamin D Supplementation in HIV-1 Infected Patients treatment 2 unknown_status NCT05024110
Effect of Exercise Intensity on Vitamin D No drug interventions treatment Not Available completed NCT01741181
Vitamin D Supplementation in Patients With Diabetes Mellitus Type 2 prevention 4 completed NCT01130181
VITdAL@ICU - Correction of Vitamin D Deficiency in Critically Ill Patients treatment 3 completed NCT02395081
Trial of Vitamin D Supplements to Raise Calcidiol Levels of Pregnant Women in Mongolia No drug interventions prevention Not Available completed NCT02145195
The Effect of Vitamin D Supplements on Vitamin D Status, Cardiometabolic Health and Immune Defense in Danish Children No drug interventions prevention Not Available completed NCT00374595
Vascular Risk After Kidney Transplantation No drug interventions Not Available Not Available completed NCT03820895
Vitamin D Levels in Adolescent Idiopathic Scoliosis No drug interventions Not Available Not Available completed NCT06292195
Effects of Vitamin D on Health Promotion During Pregnancy and Its Impact on Prematurity-Related Outcome No drug interventions Not Available Not Available recruiting NCT00381914
Vitamin D Dose-Response Study to Establish Dietary Requirements in Infants treatment 2 completed NCT01778114
Availability of Vitamin D in Orange Juice No drug interventions other Not Available completed NCT03053414
Vitamin D Repletion and Maintenance in IBD: How Much and How Often No drug interventions treatment Not Available withdrawn NCT03096314
Vitamin D to Improve Outcomes by Leveraging Early Treatment treatment 3 completed NCT02590614
Genetic, Dietary and Environmental Influences on Vitamin D Metabolism No drug interventions basic_science Not Available completed NCT03594214
Prognostic Value of Vitamin D Levels in Egyptian Females With Breast Cancer No drug interventions Not Available Not Available unknown_status NCT03253055
The D-BIICEP Study No drug interventions Not Available Not Available completed NCT01287455
The Effect of Vitamin D Replacement on Airway Reactivity, Allergy and Inflammatory Mediators in Exhaled Breath Condensate in Vitamin D Deficient Asthmatic Children Not Available Not Available completed NCT05260255
Effect of Vitamin D Supplement on Disease Activity in SLE treatment Not Available unknown_status NCT04308850
Exploring the Effects of Vitamin D Supplementation on the Chronic Course of Patients With Crohn's Disease With Vitamin D Deficiency treatment 0 unknown_status NCT06258850
REstoration of VItamin D in Pulmonary Arterial Hypertension treatment 4 not_yet_recruiting NCT02275650
The Role of Narrowband Ultraviolet B Exposure in the Maintenance of Vitamin D Levels During Winter No drug interventions prevention Not Available completed NCT03686150
Vitamin D Oral Replacement in Asthma No drug interventions other Not Available completed NCT03101150
Effect of Vitamin D3 Supplementation in Pregnancy on Risk of Pre-eclampsia prevention 1 / 2 completed NCT03734250
D Vitamin Effects on Neuromuscular Blocker Reverse Time No drug interventions Not Available Not Available completed NCT01417923
The Immune and Clinical Impacts of Vitamin D in Patients With Chronic Musculo-skeletal Pain treatment 4 unknown_status NCT05806723
Effects of High Intensity Statin Therapy on Steroid Hormones and Vitamin D in Type 2 Diabetic Men treatment 4 completed NCT02956408
Efficacy of Vitamin D Supplementation in Obese Children No drug interventions supportive_care Not Available completed NCT03683238
Nutritional Status and Hidradenitis Suppurativa (Acne Inversa) No drug interventions Not Available Not Available completed NCT05460338
Vitamin D, Oxidative Stress and Inflammation in Hemodialysis treatment 2 / 3 completed NCT04822038
Immunomodulating Effects of Supplementation With 25-OH Vitamin D No drug interventions treatment Not Available completed NCT04395638
Replenishing and Maintaining Vitamin D Status in Older Adults in Residential Care Facilities in NI No drug interventions treatment Not Available suspended NCT05389943
The Effect of Vitamin D3 Therapy in Post Menopausal Women and Assessment of Changes in Bone Mineral Density After Orally Vitamin D3 Administration treatment 1 unknown_status NCT03482843
Vitamin D Effect on Subarachnoid Hemorrhage No drug interventions Not Available Not Available unknown_status NCT02158143
A Single High-dose Oral Supplement of Vitamin D in Young Chinese No drug interventions treatment Not Available completed NCT06406543
Vitamin D in Armenia: Vitamin D Repletion Strategies With Dibase, and Vitamin D and Vitamin D Binding Protein and COVID No drug interventions treatment Not Available active_not_recruiting NCT01145703
Vitamin D Supplementation and Metabolism in Vitamin D Deficient Elderly No drug interventions prevention Not Available terminated NCT04885803
Vitamin D Absorbance Study - Clinical Trial of the Absorbance of Nano Liquid D3 No drug interventions other Not Available completed NCT03063190
Cholecalciferol Supplementation in Restless Leg Syndrome in Patients With Chronic Kidney Disease treatment 4 withdrawn NCT00681590
Safety of Vitamin D Supplementation in Older Persons No drug interventions prevention 3 completed NCT04120064
Treatment of Vitamin D Deficiency With Large Bolus Cholecalciferol treatment 1 terminated NCT02678364
Effect of Vitamin D-biofortified Eggs on Wintertime Serum 25-hydroxyvitamin D in Adults: Randomized Controlled Trial No drug interventions prevention Not Available completed NCT03437421
Myocardial Function and Vitamin D Supplementation in Diabetes. No drug interventions supportive_care Not Available completed NCT03649802
Vitamin D and Arterial Stiffness in Elderly No drug interventions treatment 2 completed NCT00415402
Effect of Vitamin D Supplementation on Health of Low Birth Weight Infants prevention Not Available completed NCT01688102
The Effect of Oral Vitamin D Versus Narrow-Band UV-B Exposure on the Lipid Profile No drug interventions treatment Not Available completed NCT00752102
Vitamin D and Coronary Calcification Study prevention 4 completed NCT02005302
Optimizing Treatment Programs for Chronic Kidney Disease-mineral and Bone Disorder and Malnutrition treatment 4 unknown_status NCT01410084
Improving Vitamin D Status in Home-bound Elders No drug interventions treatment Not Available completed NCT01013584
The Effect of Weight on Vitamin D Dose Response No drug interventions treatment Not Available completed NCT02613884
Safety, Efficacy, and Feasibility of High-dose Cholecalciferol in Pediatric Patients With Cystic Fibrosis No drug interventions treatment 2 completed NCT02422784
Effects of Vitamin D Fortification on Vitamin D Metabolite Profiles and Status in Vitamin D Insufficient Individuals No drug interventions treatment 1 withdrawn NCT00548379
Kabul Vitamin D Supplementation Trial prevention 3 unknown_status