Search | Clinical Trials Finder

These results were retrieved from the live ClinicalTrials.gov registry. Filters and sort order apply to this result list.

ClinicalTrials.gov public records Last synced Nov 15, 2026, 1:01 PM EST

All trial information on this site comes from the official ClinicalTrials.gov public API (clinicaltrials.gov/api/v2), run by the U.S. National Library of Medicine. We only display that public information; we do not add opinions, endorsements, or any other intent. Always review the official ClinicalTrials.gov record for the latest information.

Showing 457–480 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Anemia, Vitamin D Deficiency
Interventions: Not listed
Lead sponsor: Avera McKennan Hospital & University Health Center; Other
Eligibility: 30 Years to 50 Years
Enrollment: 50 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Sioux Falls, South Dakota

Conditions: Follicular Lymphoma, Small Lymphocytic Lymphoma, Marginal Zone Lymphoma, Mucosal-Associated Lymphoid Tissue Lymphoma
Interventions: Vitamin D, Rituximab, Placebo; Dietary Supplement · Biological · Other
Lead sponsor: Jonathan Friedberg; Other
Eligibility: 18 Years and older
Enrollment: 211 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2024
U.S. locations: 7
States / cities: Miami, Florida • Atlanta, Georgia • Iowa City, Iowa + 4 more

Conditions: Vitamin D Deficiency
Interventions: 250,000 IU cholecalciferol as single, oral dose, Placebo; Dietary Supplement
Lead sponsor: Emory University; Other
Eligibility: 18 Years to 65 Years
Enrollment: 28 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2017
U.S. locations: 1
States / cities: Atlanta, Georgia

Conditions: Vitamin D Deficiency, Anemia
Interventions: Not listed
Lead sponsor: Kaiser Permanente; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2009
U.S. locations: 1
States / cities: Los Angeles, California

Conditions: Tuberculosis
Interventions: Vitamin D3, Placebo; Drug
Lead sponsor: Atlanta VA Medical Center; Federal
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2010
U.S. locations: 1
States / cities: Atlanta, Georgia

Conditions: Vitamin D Inadequacy, Vitamin D Deficiency
Interventions: Cholecalciferol (vitamin D3), Ergocalciferol (vitamin D2), Placebo; Dietary Supplement
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 65 Years and older
Enrollment: 64 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2007 – 2008
U.S. locations: 1
States / cities: Madison, Wisconsin

Conditions: Neurotoxicity
Interventions: Vitamin D3; Drug
Lead sponsor: Gerald Higa, PharmD.; Other
Eligibility: 18 Years to 90 Years
Enrollment: 9 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012
U.S. locations: 1
States / cities: Morgantown, West Virginia

Conditions: Health and Wellbeing
Interventions: Multivitamin Supplement; Dietary Supplement
Lead sponsor: Love Wellness; Industry
Eligibility: 18 Years and older · Female only
Enrollment: 40 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2024
U.S. locations: 1
States / cities: Santa Monica, California

Conditions: Graft Vs Host Disease
Interventions: Calcipotriene; Dietary Supplement
Lead sponsor: Children's Hospital Medical Center, Cincinnati; Other
Eligibility: 3 Months to 35 Years
Enrollment: 10 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2019
U.S. locations: 1
States / cities: Cincinnati, Ohio

Conditions: Health, Subjective, Gastrointestinal Dysfunction, Cardiovascular Risk Factor, Autoimmune Diseases, Dental Diseases, Hormone Disturbance, Neurocognitive Dysfunction
Interventions: Supplements and/or medical foods, Behavioral change support program, Food plan; Dietary Supplement · Behavioral · Other
Lead sponsor: Metagenics, Inc.; Industry
Eligibility: 18 Years to 80 Years
Enrollment: 400 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2018 – 2022
U.S. locations: 1
States / cities: Gig Harbor, Washington

Conditions: Mineral Absorption
Interventions: Vitamin D; Dietary Supplement
Lead sponsor: Baylor College of Medicine; Other
Eligibility: 4 Years to 8 Years
Enrollment: 60 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Prostate Cancer
Interventions: cholecalciferol; Dietary Supplement
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years to 90 Years · Male only
Enrollment: 52 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2011
U.S. locations: 1
States / cities: Charleston, South Carolina

Conditions: Stage I Prostate Cancer AJCC v8, Stage II Prostate Cancer AJCC v8, Stage III Prostate Cancer AJCC v8, Stage IVA Prostate Cancer AJCC v8
Interventions: Biospecimen Collection, D Vitamin, Dual X-ray Absorptiometry, Placebo Administration, Quality-of-Life Assessment, Questionnaire Administration; Procedure · Dietary Supplement · Drug + 1 more
Lead sponsor: University of Rochester; Other
Eligibility: 50 Years and older · Male only
Enrollment: 240 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2023 – 2029
U.S. locations: 51
States / cities: Newark, Delaware • Danville, Illinois • Decatur, Illinois + 39 more

Conditions: Vitamin D Deficiency Disease
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Madigan Army Medical Center; Federal
Eligibility: 18 Years and older
Enrollment: 131 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2016 – 2018
U.S. locations: 1
States / cities: Tacoma, Washington

Conditions: Vitamin D Deficiency
Interventions: cholecalciferol, Placebo; Dietary Supplement
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 50 Years to 100 Years · Female only
Enrollment: 62 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2014
U.S. locations: 1
States / cities: Madison, Wisconsin

Conditions: Age-Related Osteoporosis
Interventions: Teriparatide, Alendronate; Drug
Lead sponsor: Madhumathi Rao; Other
Eligibility: 40 Years and older
Enrollment: 60 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2022 – 2027
U.S. locations: 1
States / cities: Lexington, Kentucky

Conditions: Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions: CTA018 Injection; Drug
Lead sponsor: OPKO IP Holdings II, Inc.; Industry
Eligibility: 18 Years to 80 Years
Enrollment: 41 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2010
U.S. locations: 5
States / cities: Pembroke Pines, Florida • Meridian, Idaho • Springfield, Massachusetts + 2 more

Conditions: Stargardt Disease, Stargardt Macular Degeneration, Stargardt Macular Dystrophy, Autosomal Recessive Stargardt Disease 1 (ABCA4-related)
Interventions: ALK-001; Drug
Lead sponsor: Alkeus Pharmaceuticals, Inc.; Industry
Eligibility: 8 Years to 70 Years
Enrollment: 200 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2029
U.S. locations: 8
States / cities: Phoenix, Arizona • Los Angeles, California • Aurora, Colorado + 5 more

Conditions: Secondary Hyperparathyroidism
Interventions: DP001; Drug
Lead sponsor: Deltanoid Pharmaceuticals; Industry
Eligibility: 18 Years and older
Enrollment: 42 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2014
U.S. locations: 6
States / cities: Tucson, Arizona • Tustin, California • Denver, Colorado + 3 more

Conditions: Diabetes Mellitus, Type 2
Interventions: pioglitazone, rosiglitazone, placebo, Vitamin D, Placebo; Drug · Dietary Supplement
Lead sponsor: GlaxoSmithKline; Industry
Eligibility: 50 Years and older
Enrollment: 1,332 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2010
U.S. locations: 23
States / cities: Long Beach, California • Los Angeles, California • Northridge, California + 19 more

Conditions: Bone Density, Bone Health, Fractures
Interventions: Vitamin D3 placebo, Fish oil placebo, Omega-3 fatty acids (fish oil), Vitamin D3; Dietary Supplement · Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 50 Years and older
Enrollment: 25,871 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2026
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Dry Eye Syndrome
Interventions: Omega 3, Vitamins A, D3 and E; Dietary Supplement
Lead sponsor: Eye and Vision Technologies and Research Institute; Network
Eligibility: 18 Years to 79 Years
Enrollment: 80 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012
U.S. locations: 4
States / cities: Conifer, Colorado • Oak Lawn, Illinois • Lexington, Kentucky + 1 more

Conditions: Rheumatoid Arthritis, Vitamin D Deficiency
Interventions: Placebo sugar pill, Ergocalciferol; Drug
Lead sponsor: Johns Hopkins University; Other
Eligibility: 18 Years to 75 Years
Enrollment: 139 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Baltimore, Maryland

Conditions: Perimenopausal Bone Loss
Interventions: Prunes, Calcium supplement, Vitamin D Supplement; Dietary Supplement
Lead sponsor: Penn State University; Other
Eligibility: 44 Years to 55 Years · Female only
Enrollment: 124 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2025 – 2029
U.S. locations: 1
States / cities: University Park, Pennsylvania

Search by objective public record fields.

Evaluate the Change in Iron, Vitamin D, and C-Reactive Protein Level (CRP) in a 12 to 24 Week Period

A Study to Evaluate the Effect of Vitamin D on PFS in Indolent Non-Hodgkin's Lymphoma

A Single Wintertime Dose of Vitamin D3 to Prevent Winter Decline in Vitamin D Status in Healthy Adults

Effect of Vitamin D Supplementation on Erythropoietin Dosage in Hemodialysis Patients Who Have Vitamin D Deficiency

Vitamin D in Active Tuberculosis (TB) Study

Clinical Approaches to Correcting Vitamin D Inadequacy and Maintaining Adequacy

Study to Assess Prevention of Oxaliplatin-induced Neurotoxicity Through Vitamin D Pathway

A Single Group Study to Evaluate the Effects of a Multivitamin on a Range of Health and Wellbeing Outcomes.

Topical Vitamin D in Acute Graft Versus Host Disease of the Skin

Personalized Lifestyle Intervention for Improving Functional Health Outcomes Using N-of-1 Tent-Umbrella-Bucket Design

Evaluation of Calcium, Vitamin D, Magnesium, and Zinc Absorption in Children

Vitamin D3 Supplementation in Participants Diagnosed With Early-Stage Prostate Cancer Who Decide to Undergo Active Surveillance Treatment Regimen.

Vitamin D for Prostate Endocrine Therapy

Vitamin D Supplementation in Warfighters

Improving the Understanding of the Response to Vitamin D Supplementation

Novel Precision Medicine Approach to Treatment of Osteoporosis Based on Bone Turnover

Safety Study of CTA018 Injection to Treat Stage 5 Chronic Kidney Disease

Open-Label Extension: Tolerability and Effects of ALK-001 on Stargardt Disease (TEASE)

A Phase 2A Dose-ranging and Pharmacokinetic Study of an Oral Vitamin D Compound (DP001) in Secondary Hyperparathyroidism

Thiazolidinedione Intervention With Vitamin D Evaluation

VITamin D and OmegA-3 TriaL: Interrelationship of Vitamin D and Vitamin K on Bone (VITAL)

Oral Nutrition Impact on Tear Film

Treatment of Vitamin D Deficiency in Patients With Rheumatoid Arthritis

Prunes Preventing Bone Loss in Perimenopause