Not applicableTemporarily pausedNCT04339530What this trial is testingVitamin D and Type 2 Diabetes Risk in UK AdultsWho this might be right forOverweightObesity Liverpool Hope University 300
Not applicableStudy completedNCT01623414What this trial is testingSunlight Exposure and Vitamin D Status of Children of South Asian Ethnicity Living in the UKWho this might be right forHealthy Volunteers University of Manchester 131
Not applicableStudy completedNCT03221972What this trial is testingVitamin D of Chinese Children and AdolescentsWho this might be right forVitamin D Deficiency Lichen Yang 15,000
Not applicableStudy completedNCT01634607What this trial is testingBone Health and Vitamin D StatusWho this might be right forOsteopeniaVitamin D DeficiencyHIV Infection Thai Red Cross AIDS Research Centre 235
Testing effectiveness (Phase 2)Study completedNCT04979065What this trial is testingNutrition, Immunity, and Covid-19 in Obese PeopleWho this might be right forVitamin D DeficiencyCovid19Overweight and Obesity+1 more Indonesia University 93
Not applicableStudy completedNCT00494104What this trial is testingPrevention of Vitamin D DeficiencyWho this might be right forVitamin D Deficiency Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) 398
Not applicableStudy completedNCT03197636What this trial is testingCo-stimulatory Markers and Vitamin D Status in Anti-PD1 Treated Melanoma PatientsWho this might be right forMalignant Melanoma Aarhus University Hospital 40
Not applicableStudy completedNCT04519034What this trial is testingVitamin D Status and Immune-inflammatory Status in Different UK Populations With COVID-19 InfectionWho this might be right forCovid19 Guy's and St Thomas' NHS Foundation Trust 27,628
Not applicableUnknownNCT04105881What this trial is testingCorrelation Between Vitamin D and B Regulatory Cell in PregnancyWho this might be right forLabor, Premature Assiut University 90
Not applicableStudy completedNCT01141192What this trial is testingThe Effect of Vitamin D Supplementation on Glucose Metabolism in Non-Diabetic African American AdultsWho this might be right forType 2 Diabetes Augusta University 48
Post-approval studies (Phase 4)Study completedNCT01025128What this trial is testingVitamin D Status in Males in Jerusalem Area and Its Correlation to Parathyroid Hormone (PTH) Level and Bone Mineral DensityWho this might be right forVitamin D DeficiencySecondary HyperparathyroidismOsteomalacia Clalit Health Services 210
Not applicableUnknownNCT01498965What this trial is testingThe Cork BASELINE Birth Cohort StudyWho this might be right forFood AllergyEczemaObesity National Children's Research Centre, Ireland 2,185
Large-scale testing (Phase 3)Study completedNCT01190137What this trial is testingStudy Comparing Two Isoforms of Vitamin D Supplements for InfantsWho this might be right forHealthy McGill University 52
Not applicableStudy completedNCT02548520What this trial is testingMaternal and Infant Vitamin Status During the First Nine Months of Infant LifeWho this might be right forRicketsOsteomalaciaOsteoporosis University of Aarhus 107
Not applicableStudy completedNCT04117750What this trial is testingImpact of Vitamin D Supplementation on Cardiometabolic Status and Androgen Profile in Polycystic Ovary SyndromeWho this might be right forEvaluations, Diagnostic SelfTreatment Adherence Zagazig University 145
Early research (Phase 1)Study completedNCT00938600What this trial is testingAntenatal Vitamin D3 Dose-finding and Safety StudyWho this might be right forPregnancyNutritional StatusVitamin D Johns Hopkins Bloomberg School of Public Health 75
Not applicableStudy completedNCT04694976What this trial is testingVitamin D Status in Children With Sickle Cell Disease Living in Lyon, FranceWho this might be right forVitamin D DeficiencySickle Cell Disease Hospices Civils de Lyon 130
Not applicableStudy completedNCT06705582What this trial is testingOASIS Study: Vitamin D Deficiency Prevention Among Older Adults in IrelandWho this might be right forVitamin D Deficiency University College Cork 117
Large-scale testing (Phase 3)WithdrawnNCT02138591What this trial is testingTherapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures.Who this might be right forVitamin d Deficiency University of Missouri, Kansas City
Not applicableStudy completedNCT01477827What this trial is testingSunlight Exposure and Vitamin D in ChildrenWho this might be right forHealthy Schoolchildren University of Manchester 125