Not applicableStudy completedNCT02495584What this trial is testingD-Light InterventionWho this might be right for25-hydroxyvitamin D Concentration (Vitamin D Status) University of Ulster 52
Post-approval studies (Phase 4)Study completedNCT01924910What this trial is testingA Single Wintertime Dose of Vitamin D3 to Prevent Winter Decline in Vitamin D Status in Healthy AdultsWho this might be right forVitamin D Deficiency Emory University 28
Post-approval studies (Phase 4)Study completedNCT02158598What this trial is testingComparison of Changes in Serum 25(OH)D Concentrations Following Vitamin D Supplementation With Chewable Tablets Versus PillsWho this might be right forVitamin D Deficiency CHU de Quebec-Universite Laval 38
Not applicableLooking for participantsNCT06921720What this trial is testingPhosphorus-31 Spectroscopy in Phosphate DiabetesWho this might be right forPhosphate DiabetesX-linked Hypophosphatemia Hospices Civils de Lyon 65
Early research (Phase 1)Study completedNCT03103750What this trial is testingVitamin D as a Therapeutic Adjunct in the Stimulant Treatment of ADHDWho this might be right forADHD Yale University 24
Not applicableStudy completedNCT05541094What this trial is testingStudy of Vitamin D Fortification of Milk and OilWho this might be right forHealthy Individuals Dr. Anuradha Khadilkar 448
Not applicableStudy completedNCT01926808What this trial is testingVitamin D Serum Concentrations & Supplementation in Children With Cerebral PalsyWho this might be right forVitamin D Deficiency Akron Children's Hospital 115
Not applicableUnknownNCT05018988What this trial is testingVitamin D in School ChildrenWho this might be right forVitamin D DeficiencyMusculoskeletal DiseasesCognitive Delay, Mild University of Ulster 118
Early research (Phase 1)Study completedNCT03537027What this trial is testingEfficiency of Vitamin D3 and 25-hydroxyvitamin D3 on Transcriptomic Changes of Low Vitamin D RespondersWho this might be right forVitamin D Receptor Target Gene ExpressionSerum 25(OH)D Concentration University of Eastern Finland 40
Post-approval studies (Phase 4)Study completedNCT02186106What this trial is testingDosage Calculation for Vitamin D TreatmentWho this might be right forDeficiency, Vitamin DObesity Bispebjerg Hospital 31
Not applicableStudy completedNCT01102751What this trial is testingSerum FGF-23 and Vitamin D DeficiencyWho this might be right forOsteomalacia Istanbul University
Not applicableStudy completedNCT03403647What this trial is testingEffect of Vitamin D on Everolimus Trough Concentrations Among Heart Transplanted PatientsWho this might be right forVitamin D Deficiency Sheba Medical Center 11
Not applicableNot Yet RecruitingNCT07349459What this trial is testingCardioprotective Effect of Melatonin Versus Vitamin D in Breast Cancer Patients Receiving DoxorubicinWho this might be right forMelatoninBreast Cancer Patients DiagnosedVitamin D Concentration+1 more Tanta University 90
Testing effectiveness (Phase 2)Study completedNCT03310307What this trial is testingVitamin D3 Treatment and Homocysteine Concentrations Among Overweight Reproductive WomenWho this might be right forHomocystinaemiaVitamin D Deficiency Al-Balqa Applied University 100
Not applicableStudy completedNCT02334592What this trial is testingVitamin D Production Levels Achieved by Sunbed TanningWho this might be right forHealthy Vitamin D Society 87
Post-approval studies (Phase 4)Study completedNCT03035084What this trial is testingIs Vitamin D2 Treatment-associated Decrease in 25(OH)D3 Level a Reciprocal Phenomena?Who this might be right forVitamin D Deficiency25-Hydroxyvitamin D Concentration King Faisal Specialist Hospital & Research Center 100
Not applicableStudy completedNCT02460211What this trial is testingAcute Effect of Systemic Stress on Measured Blood Concentrations of 25 (OH) Vitamin DWho this might be right forCardiovascular DiseaseVitamin D Deficiency Intermountain Health Care, Inc. 150
Not applicableStudy completedNCT02150122What this trial is testingDietary Requirement for Vitamin D in Adolescents Aged 14-18 YearsWho this might be right forSerum 25-hydroxyvitamin D Concentrations (25OHD) University of Surrey 120
Large-scale testing (Phase 3)Study completedNCT01909622What this trial is testingTrial of Vitamin D Fortified MilkWho this might be right for25-hydroxyvitamin D Serum Concentrations University of Michigan 80
Post-approval studies (Phase 4)UnknownNCT04284059What this trial is testingAdjuvant Effects of Vitamin A and Vitamin D Supplementation on Treatment of Children With ADHDWho this might be right forADHD Chen Li 504