| Vitamin D Supplementation of Lactating Mothers (NCT01506557) | Children's Memorial Health Institute, Poland | 2011-03-01 |
| African American Children, Glycemic Control, and Type 2 Diabetes (NCT01325987) | University of Alabama at Birmingham | 2011-03-01 |
| Correction of Vitamin D Levels and Its Effect on Insulin Resistance and Weight Gain in Obese Youth (NCT02168660) | Perrin C White, MD | 2011-03-01 |
| Nutrition and Body Composition in Acute Lymphoblastic Leukemia (NCT01317940) | Children's Hospital Los Angeles | 2011-03-01 |
| Rapid vs Maintenance Vitamin D Supplementation in Deficient Children With Asthma to Prevent Exacerbations. (NCT01395589) | Hamad Medical Corporation | 2011-02-01 |
| The Effect of Vitamin D Replacement on Airway Reactivity, Allergy and Inflammatory Mediators in Exhaled Breath Condensate in Vitamin D Deficient Asthmatic Children (NCT01287455) | Rambam Health Care Campus | 2011-02-01 |
| Community Interventional Trial (CITFOMIST) (NCT02035423) | Tehran University of Medical Sciences | 2011-01-01 |
| Sustainability of Vitamin D Levels After Repletion With Ergocalciferol In Chronic Kidney Disease Stage 5D (NCT01312441) | Albany College of Pharmacy and Health Sciences | 2011-01-01 |
| Hemodialysis Vitamin D Pilot (NCT01214928) | St. Joseph's Healthcare Hamilton | 2011-01-01 |
| Study to Observe the Capability to Absorb Calcium as an Measure of Adequate Levels of Vitamin D (NCT01119378) | Winthrop University Hospital | 2010-12-01 |
| Vitamin D Supplementation in Breastfeeding Women (NCT01240265) | Mayo Clinic | 2010-12-01 |
| The Effect of a Meal on Vitamin D Absorption (NCT01268176) | Tufts University | 2010-12-01 |
| Asthma, Missed Immunizations, and Vitamin D Deficiency in Atopic Dermatitis (NCT01234909) | Medical College of Wisconsin | 2010-11-01 |
| Vitamin D Deficiency and Atopic Dermatitis (NCT01337635) | Medical College of Wisconsin | 2010-11-01 |
| Improving Vitamin D Status in Home-bound Elders (NCT01410084) | Wake Forest University Health Sciences | 2010-10-01 |
| Vitamin D Deficiency in Adolescent Girls (NCT01180946) | Massachusetts General Hospital | 2010-09-01 |
| The Role of Vitamin D in Menopause: Relationship to Menopausal Symptoms in Body Composition (NCT01141972) | Kaiser Permanente | 2010-09-01 |
| Vitamin D in Pediatric Crohn's Disease (NCT01187459) | University of British Columbia | 2010-09-01 |
| Vitamin D Repletion in Stone Formers With Hypercalciuria (NCT01295879) | New York Presbyterian Hospital | 2010-09-01 |
| Environmental & Genetic Influences on Vitamin D Status (NCT01208636) | Creighton University | 2010-08-01 |
| Vitamin D and Muscle Strength and Surface (Electromyography) EMG (NCT01190683) | Indian Council of Medical Research | 2010-08-01 |
| Impact of Vitamin D Repletion in Hemodialysis Patients (NCT01175798) | Mehrotra, Anita, M.D. | 2010-08-01 |
| Effects of Vitamin D Supplementation During Pregnancy on Clinical Outcomes and Immune Function (NCT01417351) | USDA, Western Human Nutrition Research Center | 2010-08-01 |
| Vitamin D in Vulnerable Adults (VIVA-VA) (NCT01170273) | VA Office of Research and Development | 2010-08-01 |
| Effects of Vitamin D Insufficiency in Man (NCT01848236) | University of California, Los Angeles | 2010-08-01 |
| Effect of Vitamin D Replacement During Winter Months in Patients With Hypertension (NCT01166165) | Regional Hospital Holstebro | 2010-07-01 |
| Vitamin D Supplementation in CAD and Postchallenge Hyperglycemia (NCT01183442) | Medical University of Graz | 2010-06-01 |
| Primary Hyperparathyroidism (PHPT): Early Effect of Vitamin D (NCT01329666) | Columbia University | 2010-05-01 |
| Vitamin D and Physical Performance Before and After Intervention and Birth Outcome in Pregnant Somali and Swedish Women (NCT02922803) | Uppsala University | 2010-05-01 |
| Vitamin D Supplementation and Metabolism in Vitamin D Deficient Elderly (NCT01145703) | Baltimore VA Medical Center | 2010-05-01 |
| VITdAL@ICU - Correction of Vitamin D Deficiency in Critically Ill Patients (NCT01130181) | Harald Dobnig, MD | 2010-05-01 |
| Vitamin D Levels in Residents in Medicine (NCT01118806) | Meir Medical Center | 2010-05-01 |
| Effect of Consumption of Post-harvest UV-B Treated Mushrooms on Vitamin D Status of Healthy Adults (NCT01443897) | USDA, Western Human Nutrition Research Center | 2010-05-01 |
| Treatment of Vitamin D Insufficiency (NCT00933244) | University of Wisconsin, Madison | 2010-04-01 |
| Utility of a Urine Screening Tool for Vitamin D Deficiency in Infants and Toddlers (NCT01105689) | Nemours Children's Clinic | 2010-03-01 |
| Safety and Immunologic Effect of Low Dose Versus High Dose Vitamin D3 in Multiple Sclerosis (NCT01024777) | Johns Hopkins University | 2010-03-01 |
| Correlation Between Vitamin D Status and Bone Mineral Density in Patients With Hemophilia (NCT01090206) | Virginia Commonwealth University | 2010-03-01 |
| Vitamin D and Functional Outcomes After Total Hip Arthroplasty (THA) (NCT01397383) | Hospital for Special Surgery, New York | 2010-03-01 |
| Alternative Treatments of Vitamin D Deficiency (NCT01512537) | Lund University | 2010-02-01 |
| Vitamin D Supplementation Reduces Renin-Angiotensin System Activity in Obesity (NCT01068418) | Brigham and Women's Hospital | 2010-02-01 |
| Evaluation of the Effectiveness of Vitamin D Supplementation to Pregnant Women and Their Infants in Pakistan. (NCT01229189) | Aga Khan University | 2010-02-01 |
| Vitamin D Supplementation in Systemic Lupus Erythematosus (NCT01413230) | Assistance Publique - Hôpitaux de Paris | 2010-01-01 |
| Effects of Vitamin D Dose and Genotype of the Binding Protein in Infants and Children (NCT01050387) | Yale University | 2010-01-01 |
| Vitamin D Levels in Frail Elderly Patients With a Hip Fracture (NCT01816711) | University of Aarhus | 2010-01-01 |
| Effects of Vitamin D Supplementation in Obesity (NCT01037140) | University of Aarhus | 2010-01-01 |
| Vitamin D of Chinese Children and Adolescents (NCT03221972) | Lichen Yang | 2010-01-01 |
| Vitamin D Status in Males in Jerusalem Area and Its Correlation to Parathyroid Hormone (PTH) Level and Bone Mineral Density (NCT01025128) | Clalit Health Services | 2010-01-01 |
| Effects of Vitamin D Supplement Before and During Pregnancy on Birth Weight (NCT01038453) | University of Aarhus | 2009-12-01 |
| hCAP18 Levels and Vitamin D Deficiency in Chronic Kidney Disease (NCT01026363) | Massachusetts General Hospital | 2009-12-01 |
| Vitamin D Levels and Postoperative Hypocalcemia After Total Thyroidectomy (NCT01039714) | Aristotle University Of Thessaloniki | 2009-12-01 |
| Efficacy of Daily Vitamin D3 Supplementation in Normal Weight Adolescents (NCT01058720) | Mayo Clinic | 2009-12-01 |
| Role of Vitamin D in Innate Immunity to Tuberculosis (NCT01244204) | Harvard School of Public Health (HSPH) | 2009-11-01 |
| The Effect of Weight on Vitamin D Dose Response (NCT01013584) | Creighton University | 2009-11-01 |
| Influence of Vitamin D Treatment on Multi-systemic Functions in Young Men With Vitamin D Deficiency Due to Work Conditions (NCT01016184) | Rambam Health Care Campus | 2009-09-01 |
| Study of Vitamin D3 Supplementation in Patients With Chronic Kidney Disease (NCT00893451) | Sahlgrenska University Hospital | 2009-09-01 |
| Vitamin D and Chronic Renal Insufficiency (NCT00968877) | Odense University Hospital | 2009-09-01 |
| Vitamin D Deficiency in Patients With Hypertension (NCT00974922) | UConn Health | 2009-08-01 |
| The Effect of Vitamin D on Urinary Calcium Excretion in Kidney Stone Formers With High Urinary Calcium (NCT00948740) | Brigham and Women's Hospital | 2009-08-01 |
| Effect of Vitamin D3 on Vascular Function (NCT00948298) | Charles Drew University of Medicine and Science | 2009-07-01 |
| Vitamin D Supplementation in Psychiatric Illnesses (NCT01004354) | University of Massachusetts, Worcester | 2009-06-01 |
| Vitamin Deficiency and Blood Pressure in Hospitalized Jewish General Hospital (JGH) Patients (NCT00921622) | Jewish General Hospital | 2009-06-01 |
| Calcium, Vitamin D and Metformin to Treat Insulin Resistance in Obese African American Adolescent Females (NCT01107808) | University of Alabama at Birmingham | 2009-06-01 |
| Different Vitamin D Preparations & FGF23 in Humans (NCT00957879) | Massachusetts General Hospital | 2009-05-01 |
| Epidemiological Analysis of Vitamin D and Breast Cancer Risk in Saudi Arabian Women (NCT01817231) | University of Arizona | 2009-05-01 |
| Vitamin D Deficiency Causes Immune Dysfunction and Enables or Perpetuates the Development of Rheumatoid Arthritis (NCT00279461) | Indiana University | 2009-05-01 |
| Vitamin D3 Substitution in Vitamin D Deficient Kidney Transplant Recipients (NCT00752401) | Medical University of Vienna | 2009-05-01 |
| Comparison of 25-hydroxy Vitamin D Level in Caucasian Women Receiving Vitamin D Supplementation and Not Receiving Supplementation: a Randomized Controlled Trial. (NCT00882505) | Northwestern University | 2009-04-01 |
| Vitamin D, Chronic Kidney Disease (CKD) and the Microcirculation (NCT00882401) | Barts & The London NHS Trust | 2009-04-01 |
| The Effect of Vitamin D Statues on Endothelial Function (NCT01049048) | University of Wisconsin, Madison | 2009-03-01 |
| Vitamin D Supplement Study for Adolescents (NCT00909454) | Augusta University | 2009-02-01 |
| Blue Sky Study: Impact of Milk and Vitamin D for Child Growth and Health (NCT00886379) | Brigham and Women's Hospital | 2009-01-01 |
| Vitamin D Supplementation Requirement in Obese Subjects (NCT00996866) | Winthrop University Hospital | 2008-12-01 |
| Cholecalciferol for Vitamin D in Adult Cystic Fibrosis (CF) Patients (NCT00685971) | Unity Health Toronto | 2008-12-01 |
| Vitamin d Levels and Coronary Catheterization (NCT00749541) | Assaf-Harofeh Medical Center | 2008-11-01 |
| Effect of Vitamin D Supplementation on Erythropoietin Dosage in Hemodialysis Patients Who Have Vitamin D Deficiency (NCT00915317) | Kaiser Permanente | 2008-10-01 |
| Vitamin D Replacement After Kidney Transplant (NCT00748618) | University of Nebraska | 2008-10-01 |
| Health Benefits of Vitamin D and Calcium in Women With PCOS (Polycystic Ovarian Syndrome) (NCT00743574) | Yale University | 2008-08-01 |
| Vitamin D Repletion in Coronary Artery Disease (NCT01570309) | Seth I. Sokol, M.D. | 2008-08-01 |
| Trial to Assess Vitamin D Requirements in Lactating Women (NCT01349127) | University College Cork | 2008-08-01 |
| Environmental Influences on Vitamin D Status (NCT00780247) | Creighton University | 2008-07-01 |
| Effects of Vitamin D on Lipids (NCT00723385) | University of California, San Francisco | 2008-07-01 |
| Vitamin D Deficiency and Low Bone Mineral Content in Children (NCT00756899) | University of Massachusetts, Worcester | 2008-07-01 |
| Effect of Vitamin D Treatment in Primary Hyperparathyroidism (NCT00674154) | University of Aarhus | 2008-05-01 |
| Cholecalciferol Supplementation, Muscle Strength (NCT00682214) | Indian Council of Medical Research | 2008-05-01 |
| Safety of Vitamin D Supplementation in Older Persons (NCT00681590) | University of Miami | 2008-04-01 |
| Assessment of Influence of Vitamin D on Insulin Secretion and Sensitivity in Obese Teenage Girls (NCT00851396) | University of Alabama at Birmingham | 2008-04-01 |
| Vitamin D3 for the Treatment of Low Vitamin D in Cystic Fibrosis (NCT00762918) | Children's Hospital of Philadelphia | 2008-03-01 |
| Interventional Trial of Vitamin D Deficiency in the Patients of General Departments (NCT00640237) | Rambam Health Care Campus | 2008-03-01 |
| Vitamin D Deficiency Still Growing (NCT03304795) | DongGuk University | 2008-01-01 |
| Controlled Trial of Prenatal Vitamin D3 Supplementation to Prevent Vitamin D Deficiency in Mothers and Their Infants (NCT00610688) | Children's Hospital Medical Center, Cincinnati | 2008-01-01 |
| Familial Clustering of Vitamin D Deficiency Via Shared Environment: The Korean National Health And Nutrition Examination Survey 2008-2012 (NCT03349879) | Yonsei University | 2008-01-01 |
| Kabul Vitamin D Supplementation Trial (NCT00548379) | London School of Hygiene and Tropical Medicine | 2007-11-01 |
| Penicillamine Chelation for Children With Lead Poisoning (NCT00552630) | FDA Office of Orphan Products Development | 2007-09-01 |
| Vitamin D Inadequacy in Rural Populations, Evaluation of Correction by Food Supplementation (NCT00690417) | University of Wisconsin, Madison | 2007-08-01 |
| The Effect of Calcium and Vitamin D in Patients With Heart Failure (NCT00497900) | Hvidovre University Hospital | 2007-08-01 |
| hCAP18 Levels and Vitamin D Deficiency in Healthy Subjects (NCT00742235) | Massachusetts General Hospital | 2007-07-01 |
| Treatment of Secondary Hyperparathyroidism in the Uremic Patient (NCT00469599) | Zealand University Hospital | 2007-07-01 |
| Sunlight Exposures Effect on Serum Vitamin D Levels (NCT00473317) | Creighton University | 2007-07-01 |
| Effects of Vitamin D on Renin Expression in Hypertensive Patients (NCT00585442) | University of Utah | 2007-05-01 |
| Vitamin D and Inflammatory Markers of Cardiovascular Disease in African Americans With Type 2 Diabetes (NCT01153243) | Cook County Health | 2007-04-01 |