| The Effects of Vitamin D Supplementation on Patients With Type 2 Diabetes and Vitamin D Deficiency (NCT01991054) | HaEmek Medical Center, Israel | 2013-12-01 |
| The Effect of Vitamin D Supplementation on HIV-associated Platelet Hyperreactivity (NCT02217553) | Universitas Padjadjaran | 2013-12-01 |
| Vitamin D Supplementation in Cirrhotic Patients (NCT02009748) | Medical University of Graz | 2013-12-01 |
| Genetic, Dietary and Environmental Influences on Vitamin D Metabolism (NCT02590614) | Milton S. Hershey Medical Center | 2013-11-01 |
| Efficacy of Vitamin D Therapy on Glucose Homeostasis in Obese Adolescents (NCT02414529) | NYU Langone Health | 2013-11-01 |
| Vitamin D Intervention Trial in Healthy Chinese, Phase II (NCT01998763) | Chinese Academy of Sciences | 2013-11-01 |
| A Single High-dose Oral Supplement of Vitamin D in Young Chinese (NCT02158143) | Chinese Academy of Sciences | 2013-10-01 |
| The Effects of Vitamin D on Angiogenic Factors in Women With Polycystic Ovary Syndrome (NCT02460380) | Maimonides Medical Center | 2013-10-01 |
| Treatment of Vitamin D Deficiency in Intestinal Rehabilitation Clinic Patients With a Portable Ultraviolet B Lamp (NCT01930539) | University of Nebraska | 2013-09-16 |
| The Effects of Serum Vitamin D and IVF Outcome (NCT02187146) | University of Birmingham | 2013-09-01 |
| The Role of Narrowband Ultraviolet B Exposure in the Maintenance of Vitamin D Levels During Winter (NCT02275650) | Joint Authority for Päijät-Häme Social and Health Care | 2013-09-01 |
| Serum Alkaline Phosphatase Levels In Healthy Turkish Children (NCT06689709) | Emine Hafize | 2013-09-01 |
| Vitamin D and Its Affect on Growth Rates and Bone Mineral Density Until Age 5 (NCT01419821) | Meir Medical Center | 2013-09-01 |
| Vitamin D and Vascular Health in Children (NCT01797302) | University of Pittsburgh | 2013-08-01 |
| Comparison of Vitamin D Status and Vitamin D Receptor Polymorphisms in Patients With High Myopia and Primary Open-angle Glaucoma (NCT03021629) | Lv Yingjuan | 2013-07-01 |
| Associations of Vitamin D Deficiency and Vitamin D Receptor Polymorphisms With the Risk of Primary Open-angle Glaucoma (NCT02539745) | Lv Yingjuan | 2013-07-01 |
| 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 (NCT01838447) | Children's Hospital of Eastern Ontario | 2013-07-01 |
| Vitamin D Serum Concentrations & Supplementation in Children With Cerebral Palsy (NCT01926808) | Akron Children's Hospital | 2013-06-01 |
| Extension Study of CTAP101-CL-3001 or CTAP101-CL-3002 (NCT02282813) | OPKO Health, Inc. | 2013-04-01 |
| 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 (NCT02069990) | Semmelweis University | 2013-03-01 |
| Effect of Vitamin D Oral Supplements on 25 OH Vitamin D Levels (NCT01170494) | King Faisal Specialist Hospital & Research Center | 2013-02-01 |
| Treatment Study of Vitamin D Deficiency in Adolescents (NCT01784029) | Montefiore Medical Center | 2013-02-01 |
| Bioavailability of Vitamin D Encapsulated in Casein Micelles, Compared to Its Bioavailability in a Synthetic Emulsifier Currently Used for Supplementation and Enrichment. (NCT01807845) | Rambam Health Care Campus | 2013-01-01 |
| Vitamin D Intervention Trial in Healthy Chinese (NCT01817036) | Chinese Academy of Sciences | 2013-01-01 |
| Vitamin D Levels in Patients With Central Retinal Vein Occlusion- a Prospective Controlled Study (NCT01793181) | St. Erik Eye Hospital | 2013-01-01 |
| Optimizing Treatment Programs for Chronic Kidney Disease-mineral and Bone Disorder and Malnutrition (NCT02005302) | Wenhu Liu | 2013-01-01 |
| The Role of Vitamin D in the Pathophysiology of Chronic Failure (NCT01993537) | Ottawa Heart Institute Research Corporation | 2013-01-01 |
| The Effect of Maternal and Neonatal Vitamin D Levels on Respiratory Distress Syndrome in Preterm Infants (NCT02024490) | Kanuni Sultan Suleyman Training and Research Hospital | 2012-12-01 |
| Comparing Different Amounts of Vitamin D Supplementation to Preschool Children Living in Northern and Southern Sweden (NCT01741324) | Umeå University | 2012-11-01 |
| The Variability of 25-hydroxyvitamin D Response From Crystalline 25-hydroxyvitamin D3 (NCT01633658) | Creighton University | 2012-11-01 |
| Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency (NCT01704079) | OPKO IP Holdings II, Inc. | 2012-11-01 |
| Effect of a Monthly High Dose of Vitamin D3 on Bariatric Surgery Patients (NCT02477956) | Texas Tech University | 2012-11-01 |
| The Genetics Behind Vitamin D Status (VitDgen) (NCT01741233) | Technical University of Denmark | 2012-11-01 |
| Effect of Vitamin D Supplementation on Endothelial Function in Obese Adolescents (NCT01746264) | Mayo Clinic | 2012-11-01 |
| Multimodal Approach in IBD Patients (NCT01705522) | Clinical Hospital Colentina | 2012-10-01 |
| Inter-relationship Between Vitamin D Requirements and Calcium Intake in Older Adults (NCT01990872) | University College Cork | 2012-10-01 |
| Vitamin D Deficiency and Asthma Exacerbation (NCT02661191) | University of Turin, Italy | 2012-10-01 |
| Effect of Vitamin D Supplementation on Glucose Tolerance in Subjects at Risk for Diabetes With Low Vitamin D. (NCT01726777) | University of Toronto | 2012-10-01 |
| Vitamin D Treatment, Pharmacogenetics and Glucose Metabolism (NCT01721915) | Medical University of Graz | 2012-10-01 |
| Effect of Vitamin D3 Supplementation in Pregnancy on Risk of Pre-eclampsia (NCT03101150) | King Fahad Medical City | 2012-10-01 |
| The Impact of Severe Vitamin D Deficiency and Its Correction on Bone Mineral Density (BMD) in Postmenopausal Women (NCT01694355) | Soroka University Medical Center | 2012-10-01 |
| Bioefficiency of of Conventional Fish and Vitamin D Fortified Fish (NCT01696526) | Ulrike Lehmann | 2012-10-01 |
| Vitamin D Supplementation Study (NCT05506696) | University of Edinburgh | 2012-09-24 |
| Vitamin D Supplementation in Patients With Diabetes Mellitus Type 2 (NCT01741181) | Tan Tock Seng Hospital | 2012-09-01 |
| Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency (NCT01651000) | OPKO IP Holdings II, Inc. | 2012-09-01 |
| The Effect of Oral Vitamin D Versus Narrow-Band UV-B Exposure on the Lipid Profile (NCT01688102) | Rockefeller University | 2012-09-01 |
| Vitamin D, Cardiovascular Disease, and African Americans (NCT01655810) | Washington University School of Medicine | 2012-08-13 |
| Vitamin D3 Supplementation for Heart Failure Patients (NCT01636570) | Heidi Moretti, MS, RD | 2012-08-01 |
| Vitamin D Replacement in Insulin Resistant South Asians (NCT01385345) | University of Leicester | 2012-08-01 |
| Metabolic Syndrome and Vitamin D Level in Old People (NCT03344718) | National Cheng-Kung University Hospital | 2012-07-30 |
| Human Pharmacology Trial of Calcium-vitamin D3 Tablet in Healthy Participants (NCT01639222) | Takeda | 2012-07-01 |
| 25- Hydroxyvitamin D Levels in Pregnancy and Effects on Pregnancy Related Disorders (NCT04637880) | Medical University of Vienna | 2012-07-01 |
| Efficacy of Vitamin D2 to Treat Chronic Kidney Disease Mineral and Bone Disorder (NCT01633853) | Dongliang Zhang, MD | 2012-07-01 |
| Vitamin D Supplementation for Extremely Preterm Infants (NCT01600430) | University of Alabama at Birmingham | 2012-06-01 |
| Vitamin D During Pregnancy (NCT01589783) | Hadassah Medical Organization | 2012-05-01 |
| Effect of Omega-3 Fatty Acid on Vitamin D Activation (NCT01596842) | Dong-A University | 2012-05-01 |
| Cholecalciferol Intervention to Prevent Respiratory Infections Study (NCT01549938) | Menzies Institute for Medical Research | 2012-05-01 |
| D-tecting Disease - From Exposure to Vitamin D During Critical Periods of Life (NCT03330301) | Bispebjerg Hospital | 2012-04-01 |
| Effect of Vitamin D Supplementation on Coronary Calcification and Parathyroid Hormone in CKD Patients (NCT01672047) | Peking University People's Hospital | 2012-04-01 |
| Serum Sclerostin Level & Treatment of Vitamin D Deficiency (NCT01553344) | Bagcilar Training and Research Hospital | 2012-03-01 |
| Comparison of Maternal and Neonatal Vitamin D Levels in Term Neonates With and Without Early Onset Sepsis (NCT02019836) | Kanuni Sultan Suleyman Training and Research Hospital | 2012-03-01 |
| Safety and Bioefficacy of Vitamin D2 and Vitamin D3 (NCT01503216) | Ulrike Lehmann | 2012-01-01 |
| Evaluating Vitamin D Content in Mushrooms (NCT01815437) | Boston University | 2012-01-01 |
| The Effect of Vitamin D Repletion in Patients With Hepatocellular Carcinoma on the Orthotopic Liver Transplant List (NCT01575717) | Andrea Branch | 2012-01-01 |
| Vitamin D Deficiency and Replacement on Pulmonary and Endocrine Function in SCI (NCT02099955) | James J. Peters Veterans Affairs Medical Center | 2012-01-01 |
| Evaluate the Change in Iron, Vitamin D, and C-Reactive Protein Level (CRP) in a 12 to 24 Week Period (NCT01328704) | Avera McKennan Hospital & University Health Center | 2012-01-01 |
| A Pilot Study of the Effect of Dietary Fat Type and Amount on Vitamin D3 Absorption (NCT01508845) | Tufts University | 2012-01-01 |
| Effects of Vitamin D on Beta Cell Function and Insulin Sensitivity in Pre-diabetes and Diabetes Mellitus Type 2 (NCT01497132) | Karolinska Institutet | 2012-01-01 |
| Vitamin D for Sickle-cell Respiratory Complications (NCT01443728) | Gary M Brittenham, MD | 2011-12-13 |
| Does Vitamin D Improve Glycemic Control in Type II DM? (NCT01170442) | King Faisal Specialist Hospital & Research Center | 2011-12-01 |
| Vitamin D Supplementation in Kidney Disease (NCT01229878) | VA Office of Research and Development | 2011-12-01 |
| Magnitude of Changes in 25 OH Vitamin D3 Levels After Vitamin D3 Supplementation (NCT01170507) | King Faisal Specialist Hospital & Research Center | 2011-12-01 |
| Improving the Understanding of the Response to Vitamin D Supplementation (NCT01465178) | University of Wisconsin, Madison | 2011-12-01 |
| Impact of Work Environment Absent of Natural Light on Vitamin D Levels (NCT01385085) | Medical Corps, Israel Defense Force | 2011-11-01 |
| Bioavailability and Biological Effects of Vitamin D2 Contained in Mushroom (NCT01488734) | Icahn School of Medicine at Mount Sinai | 2011-11-01 |
| Effects of Cholecalciferol Supplementation in Patients With Chronic Heart Failure and LOw vITamind D Levels (NCT01477801) | Azienda Unita' Sanitaria Locale Di Modena | 2011-11-01 |
| Effects of Vitamin D on Inflammation in Liver Disease (NCT01754961) | Veterans Medical Research Foundation | 2011-11-01 |
| Vitamin D Supplementation in Overweight/Obese African American Adults and Youth (D-SUNNY) (NCT01583621) | Augusta University | 2011-11-01 |
| Study of the Efficacy and Safety of Cholecalciferol Supplementation on the Activity of Rheumatoid Arthritis in Patients With Vitamin D Deficiency (NCT02243800) | University Hospital, Clermont-Ferrand | 2011-11-01 |
| How Much Vitamin D is Required to be Protective Against Deficiency During the Winter Months? (NCT01437696) | McGill University | 2011-10-01 |
| Identifying Vitamin D Deficiency in Very Low Birth Weight Infant (VLBW) Infants Part 2 (NCT01363167) | Medical University of South Carolina | 2011-10-01 |
| Oral Cholecalciferol in Prevention of Type 2 Diabetes Mellitus (NCT01436916) | Post Graduate Institute of Medical Education and Research, Chandigarh | 2011-09-01 |
| The Effect of Fat on Vitamin D Absorption (NCT01519986) | Federal University of Rio Grande do Sul | 2011-09-01 |
| Vitamin D and HIV-Cardiovascular Disease in Children and Young Adults (NCT01410305) | University Hospitals Cleveland Medical Center | 2011-09-01 |
| The Immune and Clinical Impacts of Vitamin D in Patients With Chronic Musculo-skeletal Pain (NCT01417923) | Meir Medical Center | 2011-09-01 |
| Vitamin Deficiency in Immigrants, a Treatment Study (NCT01419119) | Umeå University | 2011-09-01 |
| A Study of 25-hydroxy Vitamin d Levels in Non-itching Hemodialysis Patients (NCT01548716) | Winthrop University Hospital | 2011-09-01 |
| Effect of Vitamin D Supplementation on In-vitro Fertilization (IVF) Outcomes (NCT01419743) | Northwestern University | 2011-08-01 |
| Vitamin D3 Supplementation Pilot Study (NCT01546103) | Children's Hospital of Philadelphia | 2011-08-01 |
| Sunweavers: Supporting Native American Women's Vitamin D Research (NCT01490333) | University of Wisconsin, Madison | 2011-07-01 |
| Efficacy of Vitamin D Supplementation in Bariatric Surgery Patients (NCT01385098) | Vadim Sherman, MD | 2011-07-01 |
| Impact of Vitamin D Supplementation on Cardiometabolic Risk Factors [The Daily D Health Study] (NCT01537809) | Tufts University | 2011-06-01 |
| Effects of Vitamin D Supplementation on Glucose Metabolism in Women With Former Gestational Diabetes Mellitus (NCT01992133) | RCSI & UCD Malaysia Campus | 2011-06-01 |
| Styrian Vitamin D Hypertension Trial (NCT02136771) | Medical University of Graz | 2011-06-01 |
| Vitamin D Supplementation in Chronic Stable Heart Failure (NCT01292720) | Medical University of Graz | 2011-04-01 |
| Vitamin D Supplementation in HIV-infected Youth (NCT01656070) | University of Milan | 2011-04-01 |
| Vitamin D Effect on Calcium Absorption on Persons on Hemodialysis (NCT01325610) | Creighton University | 2011-04-01 |
| Efficacy of Vitamin D3 for the Treatment of Psoriatic Patients With Vitamin D Deficiency and Insufficiency (NCT01339741) | Chulalongkorn University | 2011-03-01 |
| Ultraviolet Light And Vitamin D In Subjects With Fat Malabsorption Or After Gastric Bypass Surgery (NCT01910792) | Boston University | 2011-03-01 |
| Effect of Vitamin D Supplementation on Hemoglobin A1c (NCT01354262) | Ascension Health | 2011-03-01 |