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ClinicalTrials.gov public records Last synced Oct 8, 2026, 1:38 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 49–63 of 63 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: vitamin D3 4000 IU Clear all

Conditions: Hypertension, Vitamin D Deficiency, Pre-Hypertension
Interventions: Cholecalciferol; Drug
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years to 50 Years
Enrollment: 534 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2013
U.S. locations: 3
States / cities: Hartford, Connecticut • Boston, Massachusetts • Minneapolis, Minnesota

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: Vitamin D Deficiency
Interventions: Cholecalciferol; Dietary Supplement
Lead sponsor: Augusta University; Other
Eligibility: 13 Years to 45 Years
Enrollment: 74 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Augusta, Georgia

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: Crohn's Disease (CD), Ulcerative Colitis (UC)
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of California, San Francisco; Other
Eligibility: 18 Years and older
Enrollment: 30 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Fresno, California

Conditions: Prediabetes, Type 2 Diabetes
Interventions: Vitamin D (Cholecalciferol), Placebo; Dietary Supplement · Other
Lead sponsor: Tufts Medical Center; Other
Eligibility: 30 Years and older
Enrollment: 2,423 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2018
U.S. locations: 25
States / cities: Phoenix, Arizona • Los Angeles, California • Palo Alto, California + 20 more

Conditions: Diabetic Kidney Disease
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years and older
Enrollment: 54 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2013
U.S. locations: 1
States / cities: Charleston, South Carolina

Conditions: Vitamin D Deficiency
Interventions: cholecalciferol (vitamin D3), cholecalciferol; Drug
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 16 Years to 45 Years · Female only
Enrollment: 501 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2004 – 2010
U.S. locations: 1
States / cities: Charleston, South Carolina

Conditions: Vitamin D Deficiency, Pregnancy
Interventions: cholecalciferol (vitamin D3), cholecalciferol; Drug
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 16 Years to 45 Years · Female only
Enrollment: 564 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2007 – 2009
U.S. locations: 1
States / cities: Columbia, South Carolina

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: Solid Cancers
Interventions: Grape Seed Extract, Vitamin D; Drug
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years and older
Enrollment: 22 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2016
U.S. locations: 1
States / cities: Charleston, South Carolina

Conditions: Protein
Interventions: Conjugated linoleic acid, Vitamin D, Conjugated linoleic acid and Vitamin D, Corn oil (placebo); Dietary Supplement · Other
Lead sponsor: Washington University School of Medicine; Other
Eligibility: 65 Years to 85 Years
Enrollment: 40 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2017 – 2019
U.S. locations: 1
States / cities: St Louis, Missouri

Conditions: Metastatic Colorectal Cancer
Interventions: FOLFOX + bevacizumab, Vitamin D; Drug · Dietary Supplement
Lead sponsor: Dana-Farber Cancer Institute; Other
Eligibility: 18 Years and older
Enrollment: 139 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2019
U.S. locations: 18
States / cities: Boise, Idaho • Fruitland, Idaho • Meridian, Idaho + 13 more

Conditions: Renal Insufficiency, Chronic, Kidney Failure, Chronic
Interventions: NanoD4CKD, MicroD4CKD; Dietary Supplement
Lead sponsor: University of Florida; Other
Eligibility: 18 Years and older
Enrollment: 21 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2023
U.S. locations: 1
States / cities: Gainesville, Florida

Conditions: Asthma
Interventions: vitamin D3 4000 IU, Placebo; Drug
Lead sponsor: Juan Celedon, MD; Other
Eligibility: 6 Years to 16 Years
Enrollment: 192 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2019
U.S. locations: 7
States / cities: San Francisco, California • Denver, Colorado • Boston, Massachusetts + 4 more

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DAYLIGHT: Vitamin D Therapy in Individuals at High Risk of Hypertension

High-dose Vitamin D Supplements in Older Adults

Vitamin D Supplementation in Overweight/Obese African American Adults and Youth (D-SUNNY)

Vitamin D and Arterial Function in Patients With Chronic Kidney Disease

Supplementation of Vitamin D3 in Patients With Inflammatory Bowel Diseases and Hypovitaminosis D

Vitamin D and Type 2 Diabetes Study

Impact of Vitamin D on Diabetic Kidney Disease in African Americans

Evaluation of Vitamin D Requirements During Pregnancy

Vitamin D Status of Pregnant Women and Their Children in Eau Claire, South Carolina

Vitamin D3 in Systemic Lupus Erythematosus

Phase I Assay-guided Trial of Anti-inflammatory Phytochemicals in Patients With Advanced Cancer

CLA and Vitamin D on Protein Turnover

Study of Vitamin D in Untreated Metastatic Colorectal Cancer

Almond Milk With Vitamin D: Impact on Vitamin D Status

Vitamin D to Prevent Severe Asthma Exacerbations (Vit-D-Kids Asthma)