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ClinicalTrials.gov public records Last synced Oct 15, 2026, 3:43 AM EDT

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

Showing 361–384 of 407 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 (cholecalciferol) placebo Clear all

Conditions: Frail Elderly, Vitamin d Deficiency
Interventions: vitamin D, placebo; Dietary Supplement
Lead sponsor: VA Office of Research and Development; Federal
Eligibility: 65 Years to 95 Years · Male only
Enrollment: 130 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2014
U.S. locations: 1
States / cities: Miami, Florida

Conditions: Hepatitis C Infection, Vitamin D Deficiency
Interventions: Vitamin D, Placebo; Drug
Lead sponsor: Veterans Medical Research Foundation; Other
Eligibility: 18 Years and older
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2014
U.S. locations: 1
States / cities: La Jolla, California

Conditions: Vitamin D Deficiency
Interventions: Transdermal D Patch, Oral vitamin D3, Placebo patch, Oral placebo; Dietary Supplement
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 18 Years to 85 Years
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2017
U.S. locations: 1
States / cities: Madison, Wisconsin

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: 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: Vitamin D Deficiency
Interventions: Vitamin D 10000 UNT, Vitamin D 5000 UNT; Drug
Lead sponsor: Virginia Polytechnic Institute and State University; Other
Eligibility: 18 Years to 30 Years
Enrollment: 68 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2017 – 2018
U.S. locations: 1
States / cities: Blacksburg, Virginia

Conditions: Osteoarthritis, Knee
Interventions: Vitamin D (cholecalciferol), Placebo; Dietary Supplement
Lead sponsor: Tufts Medical Center; Other
Eligibility: 45 Years to 90 Years
Enrollment: 146 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2009
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Cluster Headache
Interventions: Vitamin D, multivitamin, Placebo; Dietary Supplement
Lead sponsor: The University of Texas Health Science Center, Houston; Other
Eligibility: 18 Years to 70 Years
Enrollment: 27 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2021 – 2024
U.S. locations: 1
States / cities: Houston, Texas

Conditions: HIV
Interventions: Vitamin D3, Placebo, Vitamin Supplements; Drug · Other
Lead sponsor: Columbia University; Other
Eligibility: 40 Years to 70 Years · Female only
Enrollment: 85 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2016
U.S. locations: 1
States / cities: New York, New York

Conditions: Melanoma, Skin
Interventions: Vitamin D3, placebo and vitamin D; Drug
Lead sponsor: Stanford University; Other
Eligibility: 18 Years to 75 Years · Female only
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2014
U.S. locations: 1
States / cities: Palo Alto, California

Conditions: Hyperlipidemia
Interventions: Vitamin D3, Placebo; Dietary Supplement · Other
Lead sponsor: Avera McKennan Hospital & University Health Center; Other
Eligibility: 18 Years to 88 Years
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Sioux Falls, South Dakota

Conditions: Vitamin D Deficiency
Interventions: Vitamin D2, Placebo; Drug · Other
Lead sponsor: Allegheny Singer Research Institute (also known as Allegheny Health Network Research Institute); Other
Eligibility: 18 Years to 89 Years
Enrollment: 25 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2020 – 2024
U.S. locations: 1
States / cities: Pittsburgh, Pennsylvania

Conditions: Vitamin D Deficiency, Sarcopenia
Interventions: vitamin D3, Placebo; Dietary Supplement · Other
Lead sponsor: Tufts University; Other
Eligibility: 60 Years to 85 Years
Enrollment: 100 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2018
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: ADHD
Interventions: Calcitriol, Placebo; Drug · Other
Lead sponsor: Yale University; Other
Eligibility: 18 Years to 50 Years
Enrollment: 3 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020
U.S. locations: 1
States / cities: New Haven, Connecticut

Conditions: Vitamin D Deficiency, Rotator Cuff Tears
Interventions: Vitamin D3 supplementation, Placebo; Dietary Supplement · Other
Lead sponsor: Community Memorial Health System; Other
Eligibility: 18 Years to 65 Years
Enrollment: 240 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2021 – 2024
U.S. locations: 2
States / cities: Ventura, California

Conditions: Nutrient Deficiency, Happiness, Digestive Health, Vulnerability to Disease, Mood Swings, Energy
Interventions: Alii Supplement; Dietary Supplement
Lead sponsor: Texas Christian University; Other
Eligibility: 18 Years to 25 Years · Female only
Enrollment: 16 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2026
U.S. locations: 1
States / cities: Fort Worth, Texas

Conditions: Fracture
Interventions: Vitamin D3, Placebo; Drug · Other
Lead sponsor: University of Maryland, Baltimore; Other
Eligibility: 18 Years to 50 Years
Enrollment: 102 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2021
U.S. locations: 1
States / cities: Baltimore, Maryland

Conditions: Asthma
Interventions: Vitamin D 3 cholecalciferol, Vitamin D3; Dietary Supplement
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 18 Years to 39 Years · Female only
Enrollment: 876 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2023
U.S. locations: 3
States / cities: San Diego, California • Boston, Massachusetts • St Louis, Missouri

Conditions: Vitamin D Deficiency, Osteoporosis
Interventions: Vitamin D, placebo; Drug
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 55 Years and older
Enrollment: 96 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2001 – 2004
U.S. locations: 1
States / cities: Madison, Wisconsin

Conditions: Respiratory Infection
Interventions: Vitamin D3 (cholecalciferol), Placebo Sugar Pill; Dietary Supplement
Lead sponsor: University of Iowa; Other
Eligibility: 18 Years to 60 Years
Enrollment: 98 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2007 – 2010
U.S. locations: 1
States / cities: Iowa City, Iowa

Conditions: Osteogenesis Imperfecta
Interventions: Setrusumab, Placebo; Biological · Other
Lead sponsor: Ultragenyx Pharmaceutical Inc; Industry
Eligibility: 5 Years to 25 Years
Enrollment: 183 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2022 – 2027
U.S. locations: 22
States / cities: Little Rock, Arkansas • Los Angeles, California • Sacramento, California + 19 more

Conditions: Rhinitis
Interventions: Vitamin D versus placebo; Dietary Supplement
Lead sponsor: Rohr and Columbo Asthma, Allergy and Immunology Specialists, P.C.; Other
Eligibility: 65 Years and older
Enrollment: 15 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2014
U.S. locations: 2
States / cities: Bryn Mawr, Pennsylvania

Conditions: Type 2 Diabetes
Interventions: vitamin D3, cholecalciferol, Inactive comparator; Dietary Supplement
Lead sponsor: Augusta University; Other
Eligibility: 19 Years to 60 Years
Enrollment: 48 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010
U.S. locations: 1
States / cities: Augusta, Georgia

Conditions: Osteoporosis
Interventions: SMC021 Oral calcitonin, SMC021 Placebo; Drug
Lead sponsor: Nordic Bioscience A/S; Industry
Eligibility: 55 Years to 85 Years · Female only
Enrollment: 4,665 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2011
U.S. locations: 3
States / cities: Gainesville, Georgia • Detroit, Michigan • Portland, Oregon

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Vitamin D in Vulnerable Adults (VIVA-VA)

Effects of Vitamin D on Inflammation in Liver Disease

Evaluation of a Transdermal Vitamin D3 Delivery System, D3forME

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

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

Effects of Vitamin D Supplementation on Strength, Bone Density, and Injury Risk in Collegiate Athletes

Vitamin D to Slow Progression of Knee Osteoarthritis

High Dose Vitamin D Plus Multivitamin in the Prevention of Cluster Headache

Vitamin D HIV Study on Postmenopausal Women

Pilot Trial to Evaluate the Effect of Vitamin D on Melanocyte Biomarkers

A Pilot Study on the Effect of Vitamin D Treatment in Patients With Statin-Associated Myalgia

Does Supplementing Vitamin D Deficiency Affect Fusion Healing Rates in Elective Foot and Ankle Surgery?

Impact of Vitamin D on 25-hydroxyvitamin D Levels and Physical Function

Vitamin D as a Therapeutic Adjunct in the Stimulant Treatment of ADHD: a Proof-of-concept Tele-health Study of Stimulant-induced Improvement in Neurocognitive Functioning.

Vitamin D3 Supplementation for Vitamin D Deficiency in Rotator Cuff Repair Surgery

Alii Supplement Study

Optimal Vitamin D3 Supplementation Strategies for Acute Fracture Healing

Randomized Trial: Maternal Vitamin D Supplementation to Prevent Childhood Asthma (VDAART)

Vitamin D Administration in the Nursing Home

Human Lung Responses to Respiratory Pathogens

Setrusumab vs Placebo for Osteogenesis Imperfecta

Rhinitis in the Elderly: The Role of Vitamin D

The Effect of Vitamin D Supplementation on Glucose Metabolism in Non-Diabetic African American Adults

A Study to Evaluate Oral Salmon Calcitonin in the Treatment of Osteoporosis in Postmenopausal Women Taking Calcium and Vitamin D