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, 1:36 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 25–48 of 91 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: 2000 IU vitamin D3 Clear all

Conditions: Vitamin D Deficiency, Hypovitaminosis A, Vitamin E Deficiency
Interventions: Vitamin D, Vitamin D, Vitamin E, and Vitamin A, Control, 700 mg Calcium; Dietary Supplement
Lead sponsor: Boston University; Other
Eligibility: 6 Years to 10 Years
Enrollment: 180 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2005 – 2008
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Cardiovascular Disease
Interventions: Vitamin D3, Omega-3 fatty acids (fish oil), Fish oil placebo, Vitamin D3 placebo; Dietary Supplement · Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 50 Years and older
Enrollment: 25,119 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2027
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Diabetes
Interventions: Vitamin D, Omega-3 fatty acids (fish oil), Vitamin D placebo, Fish oil placebo; Dietary Supplement · Drug
Lead sponsor: University of Washington; Other
Eligibility: 50 Years and older
Enrollment: 1,312 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2019
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Physical Function, Vitamin D Insufficiency
Interventions: calcium, Vitamin D plus calcium; Dietary Supplement
Lead sponsor: Wake Forest University Health Sciences; Other
Eligibility: 70 Years to 89 Years
Enrollment: 16 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Winston-Salem, North Carolina

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: 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: Peyronie's Disease
Interventions: Vitamin D2, Vitamin E, Testosterone Pellets; Drug
Lead sponsor: Men's Health Boston; Other
Eligibility: 18 Years to 70 Years · Male only
Enrollment: 75 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2017
U.S. locations: 1
States / cities: Chestnut Hill, Massachusetts

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: Hip Fracture
Interventions: Nutrition, PUSH, PULSE; Dietary Supplement · Behavioral
Lead sponsor: University of Maryland, Baltimore; Other
Eligibility: 60 Years and older
Enrollment: 210 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2017
U.S. locations: 4
States / cities: Farmington, Connecticut • Baltimore, Maryland • Lebanon, New Hampshire + 1 more

Conditions: Obesity, Vitamin D Deficiency
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of Pittsburgh; Other
Eligibility: 10 Years to 18 Years
Enrollment: 225 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2018
U.S. locations: 1
States / cities: Pittsburgh, Pennsylvania

Conditions: Obesity
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Mayo Clinic; Other
Eligibility: 12 Years to 18 Years
Enrollment: 51 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Rochester, Minnesota

Conditions: Chronic Pain Following Thermal Burn Injury
Interventions: Omega-3 fatty acids (fish oil), Vitamin D3 (cholecalciferol), Vitamin D3 (cholecalciferol) placebo, Omega-3 fatty acid placebo; Drug
Lead sponsor: University of North Carolina, Chapel Hill; Other
Eligibility: 18 Years to 65 Years
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018 – 2020
U.S. locations: 1
States / cities: Chapel Hill, North Carolina

Conditions: Vitamin D Deficiency, Falls
Interventions: 200 IU/d cholecalciferol, 1000 IU/d cholecalciferol, 2000 IU/d cholecalciferol, 4000 IU/d cholecalciferol; Dietary Supplement
Lead sponsor: Johns Hopkins University; Other
Eligibility: 70 Years and older
Enrollment: 688 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2019
U.S. locations: 2
States / cities: Baltimore, Maryland • Hagerstown, Maryland

Conditions: Thalassemia Major
Interventions: Vitamin D3, Placebo; Drug
Lead sponsor: Weill Medical College of Cornell University; Other
Eligibility: 6 Years to 60 Years
Enrollment: 40 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2014
U.S. locations: 1
States / cities: New York, New York

Conditions: Adiposity
Interventions: Vitamin D3 (cholecalciferol), 2000 IU per day, omega-3 fatty acids (fish oil); Dietary Supplement · Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 50 Years and older
Enrollment: 600 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2022
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Cancer
Interventions: Vitamin D3, Calcium carbonate; Dietary Supplement
Lead sponsor: Creighton University; Other
Eligibility: 55 Years and older · Female only
Enrollment: 2,303 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2015
U.S. locations: 1
States / cities: Fremont, Nebraska

Conditions: HIV-associated Co-morbidities
Interventions: conventional vitamin D treatment, tiered/titrated vitamin D dosing; Dietary Supplement · Drug
Lead sponsor: Andrea Branch; Other
Eligibility: 18 Years to 70 Years
Enrollment: 62 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: New York, New York

Conditions: Nutrition Status, Bone Health
Interventions: Calcium/Vitamin D, Placebo; Dietary Supplement
Lead sponsor: United States Army Research Institute of Environmental Medicine; Federal
Eligibility: 17 Years and older
Enrollment: 380 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2016
U.S. locations: 1
States / cities: Parris Island, South Carolina

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: Muscle Strength, Sarcopenia
Interventions: Placebo, Vitamin D, Beta-hydroxy-Beta-methylbutyrate, Beta-hydroxy-Beta-methylbutyrate and Vitamin D; Dietary Supplement · Drug
Lead sponsor: Metabolic Technologies Inc.; Industry
Eligibility: 60 Years and older
Enrollment: 76 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2013
U.S. locations: 2
States / cities: Ames, Iowa • Brookings, South Dakota

Conditions: Hypertension, Kidney Diseases
Interventions: Vitamin D3, Omega-3 Fatty acids, Vitamin D3 placebo, Fish oil placebo; Dietary Supplement · Drug
Lead sponsor: Albert Einstein College of Medicine; Other
Eligibility: 50 Years to 99 Years
Enrollment: 2,232 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2022
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Vitamin D Deficiency
Interventions: 400 IU vitamin D3, 2000 IU vitamin D3; Dietary Supplement
Lead sponsor: Boston University; Other
Eligibility: 18 Years to 70 Years
Enrollment: 11 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Spinal Cord Injury
Interventions: Vitamin D and Calcium; Dietary Supplement
Lead sponsor: US Department of Veterans Affairs; Federal
Eligibility: 18 Years to 75 Years
Enrollment: 10 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2012
U.S. locations: 1
States / cities: The Bronx, 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

Search by objective public record fields.

A Randomized Controlled Trial Testing The Effect Of A Multi-Nutrient Fortified Juice

VITAL Rhythm Study

Vitamin D and Omega-3 Trial to Prevent and Treat Diabetic Kidney Disease

Vitamin D Supplementation and Physical Function in Older Adults

Vitamin D HIV Study on Postmenopausal Women

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

Testosterone Pellets Plus Vitamin D and E Versus Vitamin D and E Alone for the Treatment of Peyronie's Disease

Evaluation of Vitamin D Requirements During Pregnancy

Improving Community Ambulation After Hip Fracture

Vitamin D and Vascular Health in Children

Effect of Vitamin D3 Supplementation on Insulin Resistance and Cardiovascular Risk Factors in Obese Adolescents

Vitamin D and n-3 Polyunsaturated Fatty Acids (PUFAs) to Prevent Chronic Pain Following Major Thermal Burn Injury

Study To Understand Fall Reduction and Vitamin D in You

The Effect of Vitamin D Supplementation on Calcium Excretion in Thalassemia: a Dose Response Study

Vitamin D and Omega-3 Adiposity Trial (VITAL Adiposity)

Clinical Trial of Vitamin D3 to Reduce Cancer Risk in Postmenopausal Women

Vitamin D Supplements for HIV-positive Patients on cART

Evaluation of Calcium and Vitamin D Supplementation During Marine Corps Training

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

Nutritional Intervention for Age-related Muscular Function and Strength Losses

Effects of Vitamin D and Fish Oil on the Kidney in Hypertensives

The Effect Of Vitamin D On Measures Of Bone Health And Gene Expression

Vitamin D and Calcium Study

Efficacy of Vitamin D Supplementation in Obese Children