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ClinicalTrials.gov public records Last synced Oct 25, 2026, 4:37 PM EDT

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Showing 1–24 of 411 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D3 placebo Clear all
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

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

NCT01052051
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Jul 24, 2019 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

CLA and Vitamin D on Protein Turnover

NCT03115775
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Nov 21, 2019 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Not applicable Interventional Results available

Individualized Response to Vitamin D Treatment Study

NCT02925195
View directory record Official record
Conditions
Characteristics That Modify the Response to Cholecalciferol Treatment
Interventions
Vitamin D3, Placebo
Dietary Supplement · Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
666 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
5
States / cities
Los Angeles, California • Evanston, Illinois • Baltimore, Maryland + 2 more
Source: ClinicalTrials.gov public record
Updated Nov 2, 2023 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Comparison of 25-hydroxy Vitamin D Level in Caucasian Women Receiving Vitamin D Supplementation and Not Receiving Supplementation: a Randomized Controlled Trial.

NCT00882505
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
vitamin D, Placebo
Dietary Supplement · Other
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 47 Years · Female only
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 2, 2021 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Not applicable Interventional

Acute Effect of Systemic Stress on Measured Blood Concentrations of 25 (OH) Vitamin D

NCT02460211
View directory record Official record
Conditions
Cardiovascular Disease, Vitamin D Deficiency
Interventions
Vitamin D3, Placebo
Dietary Supplement
Lead sponsor
Intermountain Health Care, Inc.
Other
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2020
U.S. locations
1
States / cities
Murray, Utah
Source: ClinicalTrials.gov public record
Updated Apr 5, 2021 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Vitamin D HIV Study on Postmenopausal Women

NCT01375010
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Mar 7, 2019 · Synced Oct 25, 2026, 4:37 PM EDT
Not listed Phase 2 Interventional

Efficacy Study of Inecalcitol With Decitabine in Acute Myeloid Leukemia Patients Unfit for Standard Chemotherapy

NCT02802267
View directory record Official record
Conditions
Acute Myelogenous Leukemia
Interventions
Inecalcitol, Placebo Oral Tablet
Drug
Lead sponsor
Hybrigenics Corporation
Industry
Eligibility
65 Years and older
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
7
States / cities
San Diego, California • Augusta, Georgia • Las Vegas, Nevada + 4 more
Source: ClinicalTrials.gov public record
Updated Jul 2, 2017 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Treatment of Vitamin D Insufficiency

NCT00933244
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
High Dose Vitamin D3, Low Dose Vitamin D3, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
Up to 75 Years · Female only
Enrollment
230 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 10, 2015 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Evaluation of Vitamin D Requirements During Pregnancy

NCT00292591
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Sep 19, 2016 · Synced Oct 25, 2026, 4:37 PM EDT
Active, not recruiting Phase 2 Interventional

Phase 2 Tolerability and Effects of ALK-001 on Stargardt Disease

NCT02402660
View directory record Official record
Conditions
Stargardt Disease, Stargardt Macular Degeneration, Stargardt Macular Dystrophy, Autosomal Recessive Stargardt Disease 1 (ABCA4-related)
Interventions
ALK-001, Placebo
Drug
Lead sponsor
Alkeus Pharmaceuticals, Inc.
Industry
Eligibility
8 Years to 70 Years
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2028
U.S. locations
14
States / cities
Phoenix, Arizona • Los Angeles, California • Aurora, Colorado + 11 more
Source: ClinicalTrials.gov public record
Updated Sep 21, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Terminated Not applicable Interventional

The Pittsburgh Vitamin D Study: Vitamin D Supplementation in Vitamin D-deficient Subjects at Risk of Lung Cancer

NCT02532062
View directory record Official record
Conditions
Deficiency of Vitamin D3, COPD
Interventions
Cholecalciferol, multivitamin, Placebo
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
50 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 26, 2018 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Nutritional Intervention for Age-related Muscular Function and Strength Losses

NCT00874575
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Sep 17, 2014 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 4 Interventional Results available

Safety and Effects of Supplementation With Ergocalciferol on Erythropoietin Dosing in Hemodialysis Patients

NCT01395823
View directory record Official record
Conditions
End Stage Renal Disease
Interventions
ergocalciferol supplementation, placebo
Dietary Supplement · Other
Lead sponsor
Dialysis Clinic, Inc.
Industry
Eligibility
18 Years and older
Enrollment
470 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
12
States / cities
Redding, California • Albany, Georgia • Shreveport, Louisiana + 9 more
Source: ClinicalTrials.gov public record
Updated Mar 14, 2016 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 4 Interventional

Comparison of Absorption of Vitamin D in Cystic Fibrosis

NCT01880346
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Vitamin D Powder, Vitamin D Oil
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 59 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 20, 2015 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Not applicable Interventional Results available

Effect of Vitamin D Supplementation on Inflammation and Cardiometabolic Risk Factors in Obese Adolescents

NCT01217840
View directory record Official record
Conditions
Obesity
Interventions
Drisdol (Ergocalciferol) Vitamin D2, Placebo
Drug
Lead sponsor
Stanford University
Other
Eligibility
11 Years to 17 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Nov 29, 2017 · Synced Oct 25, 2026, 4:37 PM EDT
Not listed Phase 4 Interventional

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

NCT01323608
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Apr 19, 2011 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 4 Interventional Results available

Evaluating Vitamin D3 Supplement on Post-Op Outcomes

NCT04177758
View directory record Official record
Conditions
Knee Osteoarthritis
Interventions
Vitamin D, Control
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
137 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 12, 2023 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Not applicable Interventional

Vitamin D Administration in the Nursing Home

NCT00204919
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Oct 4, 2023 · Synced Oct 25, 2026, 4:37 PM EDT
Terminated Phase 4 Interventional Results available

Vitamin D Supplementation for Treatment of Heart Failure

NCT01230307
View directory record Official record
Conditions
Heart Failure
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Nov 18, 2016 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 2 Interventional

The Effect of Alendronate, Calcium, and Vitamin D on Bone Mineral Density in HIV Infected Patients

NCT00061256
View directory record Official record
Conditions
HIV Infections
Interventions
Alendronate, Calcium carbonate, Vitamin D
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
25 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 2006
U.S. locations
28
States / cities
Birmingham, Alabama • Los Angeles, California • San Diego, California + 17 more
Source: ClinicalTrials.gov public record
Updated Aug 7, 2009 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

A Prospective Trial on the Effects of Vitamin D Supplementation in Collegiate Swimmers and Divers

NCT01488227
View directory record Official record
Conditions
Healthy
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
University of Kentucky
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Feb 25, 2013 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Chronic Study on Body Composition, Training, Performance, and Recovery

NCT04230824
View directory record Official record
Conditions
Damage Muscle, Body Weight Changes, Performance Enhancing Product Use
Interventions
Pre-workout plus and Protein recovery plus, Placebo, 6-week resistance training program
Dietary Supplement · Other
Lead sponsor
Pharmanex
Industry
Eligibility
25 Years to 50 Years
Enrollment
69 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 13, 2022 · Synced Oct 25, 2026, 4:37 PM EDT
Suspended Phase 1Phase 2 Interventional

Vitamin D and Bone Homeostasis in Ortho Polytrauma Patients

NCT03066817
View directory record Official record
Conditions
Vitamin D Deficiency, Polytrauma, Orthopedic Disorder
Interventions
Ergocalciferol 8000 IU/ML Oral Liquid [DRISDOL], Propylene Glycol
Drug
Lead sponsor
New York City Health and Hospitals Corporation
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Apr 4, 2019 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Not applicable Interventional

A Pilot Study of the Impact of Vitamin D3 on Muscle Performance in Elderly Women

NCT00986596
View directory record Official record
Conditions
Sarcopenia, Falls
Interventions
vitamin D3, Placebo
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
65 Years and older · Female only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 10, 2012 · Synced Oct 25, 2026, 4:37 PM EDT