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ClinicalTrials.gov public records Last synced Nov 15, 2026, 5:47 AM EST

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Showing 25–48 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Arterial Dysfunction, Chronic Kidney Disease
Interventions: Cholecalciferol, Calcitriol; Drug
Lead sponsor: University of Colorado, Denver; Other
Eligibility: 18 Years to 80 Years
Enrollment: 128 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Aurora, Colorado

Conditions: Contiguous Stage II Small Lymphocytic Lymphoma, Noncontiguous Stage II Small Lymphocytic Lymphoma, Stage 0 Chronic Lymphocytic Leukemia, Stage I Chronic Lymphocytic Leukemia, Stage I Small Lymphocytic Lymphoma, Stage II Chronic Lymphocytic Leukemia
Interventions: curcumin, cholecalciferol, laboratory biomarker analysis, pharmacological study; Drug · Dietary Supplement · Other
Lead sponsor: Paolo Caimi, MD; Other
Eligibility: 18 Years and older
Enrollment: 35 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2018
U.S. locations: 1
States / cities: Cleveland, Ohio

Conditions: COVID-19, Coronavirus Infection, Sars-CoV2, Corona Virus Infection, COVID, Coronavirus, Coronavirus-19, Coronavirus 19
Interventions: Hydroxychloroquine, Vitamin C, Vitamin D, Zinc; Drug · Dietary Supplement
Lead sponsor: ProgenaBiome; Other
Eligibility: 18 Years and older
Enrollment: 254 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2024
U.S. locations: 1
States / cities: Ventura, California

Conditions: End Stage Renal Disease
Interventions: ergocalciferol supplementation, placebo; Dietary Supplement · Other
Lead sponsor: Dialysis Clinic, Inc.; Industry
Eligibility: 18 Years and older
Enrollment: 470 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 12
States / cities: Redding, California • Albany, Georgia • Shreveport, Louisiana + 9 more

Conditions: Diabetes, Executive Dysfunction
Interventions: Cholecalciferol; Drug
Lead sponsor: Loyola University; Other
Eligibility: 18 Years to 75 Years
Enrollment: 56 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2015 – 2018
U.S. locations: 1
States / cities: Maywood, Illinois

Conditions: Systemic Lupus Erythematosus, SLE, Lupus
Interventions: Vitamin D3, Vitamin D3 placebo; Drug
Lead sponsor: National Institute of Allergy and Infectious Diseases (NIAID); NIH
Eligibility: 18 Years and older
Enrollment: 57 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2011
U.S. locations: 8
States / cities: Birmingham, Alabama • San Francisco, California • Boston, Massachusetts + 5 more

Conditions: Hypovitaminosis D
Interventions: Vitamin D3, Calcium, and Vitamin C; Dietary Supplement
Lead sponsor: Atlantic Health System; Other
Eligibility: 6 Years to 21 Years
Enrollment: 200 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2027 – 2032
U.S. locations: 1
States / cities: Morristown, New Jersey

Conditions: Chronic Kidney Disease, Vitamin D Deficiency
Interventions: Ergocalciferol, Calcitriol; Drug
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years to 80 Years
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2014
U.S. locations: 1
States / cities: Cambridge, Massachusetts

Conditions: Osteoporosis
Interventions: Vitamin D3, Multivitamin; Drug · Dietary Supplement
Lead sponsor: Leigh Eck, MD; Other
Eligibility: 18 Years and older · Female only
Enrollment: 22 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Kansas City, Missouri

Conditions: Vitamin D Deficiency, Type 2 Diabetes Mellitus, Cardiovascular Disease
Interventions: Vitamin D3, Calcium carbonate; Dietary Supplement
Lead sponsor: Washington University School of Medicine; Other
Eligibility: 50 Years to 70 Years
Enrollment: 86 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2018
U.S. locations: 1
States / cities: St Louis, Missouri

Conditions: Vitamin D Deficiency
Interventions: Not listed
Lead sponsor: Fujirebio Diagnostics, Inc.; Industry
Eligibility: Not listed
Enrollment: 482 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2014 – 2015
U.S. locations: 1
States / cities: Mountain View, California

Conditions: Osteoporosis, Aging
Interventions: Vitamin D3, Calcium Citrate (Citracal); Dietary Supplement
Lead sponsor: Creighton University; Other
Eligibility: 57 Years and older · Female only
Enrollment: 273 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2011
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Male Infertility
Interventions: Antioxidant Supplement, Placebo; Drug · Other
Lead sponsor: Yale University; Other
Eligibility: 18 Years and older · Male only
Enrollment: 171 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2015 – 2018
U.S. locations: 10
States / cities: Los Angeles, California • San Francisco, California • Sunnyvale, California + 7 more

Conditions: Burn, Growth, Malnutrition
Interventions: Calcium,Vitamin D, Calcium, VitaminD, Sugar Pill; Dietary Supplement · Other
Lead sponsor: Kathy Prelack, PhD, RD; Other
Eligibility: 4 Years to 18 Years
Enrollment: 60 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2005 – 2007
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Healthy, no Evidence of Disease, Skin Cancer
Interventions: cholecalciferol; Drug
Lead sponsor: National Cancer Institute (NCI); NIH
Eligibility: 40 Years and older
Enrollment: 25 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Tucson, Arizona

Conditions: Bone Alteration, Dietary Modification
Interventions: Calcium/Vitamin D, Placebo; Dietary Supplement
Lead sponsor: United States Army Research Institute of Environmental Medicine; Federal
Eligibility: 17 Years to 42 Years
Enrollment: 175 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015
U.S. locations: 1
States / cities: Columbia, South Carolina

Conditions: Asthma, Vitamin D Deficiency
Interventions: Vitamin D2 + vitamin D3, Vitamin D3; Drug
Lead sponsor: Nationwide Children's Hospital; Other
Eligibility: 8 Years to 17 Years
Enrollment: 18 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2016
U.S. locations: 1
States / cities: Columbus, Ohio

Conditions: Pre-Diabetic
Interventions: Calcitriol capsules, Oral Placebo; Drug
Lead sponsor: Mayo Clinic; Other
Eligibility: 20 Years to 45 Years
Enrollment: 17 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2021
U.S. locations: 1
States / cities: Rochester, Minnesota

Conditions: Vitamin D Deficiency
Interventions: Placebo, 800 IU/day vitamin D supplementation with feedings in the first 28 days after birth, Usual Care; Dietary Supplement · Other
Lead sponsor: The University of Texas Health Science Center, Houston; Other
Eligibility: 24 Hours to 96 Hours
Enrollment: 180 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2022 – 2027
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Alopecia Areata
Interventions: Not listed
Lead sponsor: Avera McKennan Hospital & University Health Center; Other
Eligibility: 18 Years and older
Enrollment: 10 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Sioux Falls, South Dakota

Conditions: Femoral Fracture, Fragility Fracture, Muscle Atrophy
Interventions: Essential Amino Acid Supplementation; Combination Product
Lead sponsor: Michael C Willey; Other
Eligibility: 65 Years and older
Enrollment: 60 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2024 – 2026
U.S. locations: 2
States / cities: Iowa City, Iowa • Eugene, Oregon

Conditions: Vitamin D Deficiency
Interventions: Dose 1, Dose 2; Drug
Lead sponsor: University of Minnesota; Other
Eligibility: 18 Years to 85 Years
Enrollment: 10 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2016 – 2017
U.S. locations: 1
States / cities: Saint Paul, Minnesota

Conditions: Health, Subjective
Interventions: Experimental supplement, Placebo; Dietary Supplement
Lead sponsor: Auburn University; Other
Eligibility: 21 Years to 40 Years · Female only
Enrollment: 94 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2018 – 2019
U.S. locations: 1
States / cities: Auburn, Alabama

Conditions: ADHD
Interventions: Magnetic Resonance Imaging (MRI), PHNO, calcitriol, Placebo oral capsule, high-resolution research tomography, Dextro Amphetamine; Procedure · Drug · Dietary Supplement
Lead sponsor: Yale University; Other
Eligibility: 18 Years to 50 Years
Enrollment: 24 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2017 – 2023
U.S. locations: 1
States / cities: New Haven, Connecticut

Search by objective public record fields.

Vitamin D and Arterial Function in Patients With Chronic Kidney Disease

Curcumin and Cholecalciferol in Treating Patients With Previously Untreated Stage 0-II Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma

A Study of Hydroxychloroquine, Vitamin C, Vitamin D, and Zinc for the Prevention of COVID-19 Infection

Safety and Effects of Supplementation With Ergocalciferol on Erythropoietin Dosing in Hemodialysis Patients

Can Vitamin D3 Improve Cognitive Function in Individuals With Type 2 Diabetes? (THINK-D)

Vitamin D3 in Systemic Lupus Erythematosus

The Effectiveness of a Weight-dependent Algorithm for Dosing Vitamin D.

hCAP18 Levels and Vitamin D Deficiency in Chronic Kidney Disease

Impact of Vitamin D Supplementation on Lactation Associated Bone Loss

Vitamin D, Cardiovascular Disease, and African Americans

Study Vitamin D in Healthy Individuals

Vitamin D Supplementation in Older Women

Males, Antioxidants, and Infertility Trial

Bone Mineral Density, Body Composition and Growth Following Severe Burn Injury

Vitamin D Levels in the Skin of Healthy Subjects After Oral Supplementation

Efficacy of a Once Daily Calcium and Vitamin D Fortified Food Product to Improve Bone Microarchitecture

Vitamin D in Pediatric Asthma: a Randomized Controlled Open-label Pilot Trial

Effect of 1,25-dihydroxyvitamin D3, Treatment on Insulin Secretion and Muscle Strength in Pre-diabetic Persons

ViDES Trial (Vitamin D Extra Supplementation)

A Study of Vitamin D in Subjects With Alopecia Areata

Essential Amino Acid Supplementation for Femoral Fragility Fractures

Vitamin D Levels Following Topical Application of Vitamin D Ointment

The Effects of a Multi-vitamin Supplement in Adult Females

Vitamin D as a Therapeutic Adjunct in the Stimulant Treatment of ADHD