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ClinicalTrials.gov public records Last synced Nov 14, 2026, 9:42 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 49–72 of 121 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 - high dose Clear all

Conditions: Prostatic Neoplasms, Bone Mineral Density Quantitative Trait Locus 3
Interventions: vitamin D, Placebo; Dietary Supplement
Lead sponsor: University of Rochester; Other
Eligibility: 60 Years to 99 Years · Male only
Enrollment: 108 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2016
U.S. locations: 1
States / cities: Rochester, New York

Conditions: Obesity, Pediatric, Obesity, Childhood, Obesity, Morbid, Vitamin D Deficiency
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Columbia University; Other
Eligibility: 5 Years to 11 Years
Enrollment: 6 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2019
U.S. locations: 1
States / cities: New York, New York

Conditions: Respiratory Failure
Interventions: Enteral Vitamin D3 50,000 IU, Enteral Vitamin D3 100,000IU, Inactive substance; Drug · Other
Lead sponsor: Emory University; Other
Eligibility: 18 Years and older
Enrollment: 31 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2014
U.S. locations: 2
States / cities: Atlanta, Georgia

Conditions: Vitamin D Deficiency
Interventions: Prenatal Vitamin, Cholecalciferol (Vitamin D3); Drug
Lead sponsor: Children's Hospital Medical Center, Cincinnati; Other
Eligibility: 18 Years to 45 Years · Female only
Enrollment: 192 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2012
U.S. locations: 1
States / cities: Cincinnati, Ohio

Conditions: Covid19, Corona Virus Infection, Autoimmune Diseases, Coagulation Disorder, Blood
Interventions: Narrow Band ultraviolet B-Band Light, non Narrow Band ultraviolet B-Band Light; Device
Lead sponsor: Cytokind, Inc.; Industry
Eligibility: 50 Years to 110 Years
Enrollment: 30 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2021
U.S. locations: 1
States / cities: New Orleans, Louisiana

Conditions: Vitamin D Deficiency, Cognitive Decline
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of California, Davis; Other
Eligibility: 65 Years to 90 Years
Enrollment: 180 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2026
U.S. locations: 1
States / cities: Walnut Creek, California

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: 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: Leukemia, Lymphoma
Interventions: Actonel (Risedronate), Calcium, Vitamin D; Drug · Dietary Supplement
Lead sponsor: M.D. Anderson Cancer Center; Other
Eligibility: 18 Years and older
Enrollment: 72 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2004 – 2014
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Parkinson Disease, Accidental Falls
Interventions: Vitamin D3, calcium, Placebo; Drug · Dietary Supplement · Other
Lead sponsor: VA Office of Research and Development; Federal
Eligibility: 50 Years to 99 Years
Enrollment: 101 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Portland, Oregon

Conditions: Myelodysplastic Syndrome
Interventions: DN-101 (calcitriol); Drug
Lead sponsor: Novacea; Industry
Eligibility: 18 Years and older
Enrollment: 46 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2002 – 2004
U.S. locations: 10
States / cities: Hoover, Alabama • San Francisco, California • Tampa, Florida + 7 more

Conditions: End Stage Renal Disease
Interventions: Ergocalciferol, Placebo; Drug · Other
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years and older
Enrollment: 105 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2014
U.S. locations: 3
States / cities: Boston, Massachusetts

Conditions: Vitamin D Deficiency, Nephrolithiasis
Interventions: vitamin D (ergocalciferol); Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2010
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Diabetes Mellitus, Vitamin D Deficiency
Interventions: Vitamin D; Dietary Supplement
Lead sponsor: Ascension Health; Industry
Eligibility: 34 Years to 69 Years
Enrollment: 150 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2012
U.S. locations: 1
States / cities: Flint, Michigan

Conditions: Urticaria
Interventions: Vitamin D (4,000 IU/day), Vitamin D (400 IU/day), Omalizumab; Dietary Supplement · Drug
Lead sponsor: Selina Gierer, D.O.; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2019
U.S. locations: 1
States / cities: Kansas City, Kansas

Conditions: Cognitive Decline
Interventions: 540,000 IU vitamin D3, Placebo; Drug
Lead sponsor: Vanderbilt University Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 95 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018 – 2020
U.S. locations: 7
States / cities: Aurora, Colorado • Boston, Massachusetts • New York, New York + 3 more

Conditions: HIV/AIDS, Vitamin D Deficiency, Smoker Lung
Interventions: Vitamin D3 450,000 IU orally; Drug
Lead sponsor: Emory University; Other
Eligibility: 18 Years and older
Enrollment: 7 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018
U.S. locations: 2
States / cities: Atlanta, Georgia

Conditions: Metabolic Syndrome
Interventions: vitamin D3 (cholecalciferol); Dietary Supplement
Lead sponsor: Allina Health System; Other
Eligibility: 18 Years and older
Enrollment: 84 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2014
U.S. locations: 1
States / cities: Minneapolis, Minnesota

Conditions: HIV Infections
Interventions: Vitamin D control dose, Vitamin D supplementation-; Drug
Lead sponsor: University Hospitals Cleveland Medical Center; Other
Eligibility: 8 Years to 25 Years
Enrollment: 190 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2016
U.S. locations: 2
States / cities: Atlanta, Georgia • Cleveland, Ohio

Conditions: Nutrition, Healthy
Interventions: Experimental Oil with Phospholipids, Control Polyunsaturated Oil Blend; Other
Lead sponsor: Abbott Nutrition; Industry
Eligibility: 18 Years to 55 Years
Enrollment: 26 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2024
U.S. locations: 1
States / cities: North Canton, Ohio

Conditions: Colon Cancer, Rectal Cancer
Interventions: cholecalciferol; Dietary Supplement
Lead sponsor: Legacy Health System; Other
Eligibility: 18 Years to 99 Years
Enrollment: 70 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2020
U.S. locations: 3
States / cities: Gresham, Oregon • Portland, Oregon • Tualatin, Oregon

Conditions: Vitamin D Supplementation
Interventions: Supplemental Vitamin D; Drug
Lead sponsor: Boston Children's Hospital; Other
Eligibility: 11 Years to 18 Years
Enrollment: 56 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2011
U.S. locations: 1
States / cities: Boston, Massachusetts

Search by objective public record fields.

High-dose Vitamin D Supplementation for ADT-induced Side Effects

Efficacy of Vitamin D Supplementation in Obese Children

Vitamin D in Ventilated ICU Patients

Controlled Trial of Prenatal Vitamin D3 Supplementation to Prevent Vitamin D Deficiency in Mothers and Their Infants

Photo-Protection Trial (NB-UVB vs. Placebo) in High-risk Hospitalized COVID-19 Patients

High-dose Vitamin D Supplements in Older Adults

Vitamin D for Prostate Endocrine Therapy

Vitamin D Supplementation in Warfighters

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

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

A Study of Actonel for the Prevention of Bone Loss

Effects of Vitamin D in Parkinson's Disease (PD)

Study of High-Dose Pulse Administration DN-101 (Calcitriol) in Patients With Myelodysplastic Syndrome (MDS)

DIVINE: Dialysis Infection and Vitamin D In New England

The Effect of Vitamin D on Urinary Calcium Excretion in Kidney Stone Formers With High Urinary Calcium

Effect of Vitamin D Supplementation on Hemoglobin A1c

Sustained Effect of Urticaria Remission With Relatively High Dose Vitamin D Supplementation After Omalizumab Discontinuation

Vitamin D to Improve Outcomes by Leveraging Early Treatment: Long-term Brain Outcomes in Vitamin D Deficient Patients

Effect of High-Dose Vitamin D3 in Smokers and Non-Smokers With and Without HIV

Metabolic Syndrome and Insulin Resistance at Allina

Vitamin D Supplementation in HIV Youth

Evaluation of a Nutritional Technology for Vitamin D Absorption

Effectiveness of High Dose Vitamin D Supplementation in Stage III Colorectal Cancer

Vitamin D Supplementation in Healthy Adolescents