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ClinicalTrials.gov public records Last synced Oct 8, 2026, 6:57 PM EDT

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Showing 25–48 of 407 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D3 (cholecalciferol) placebo Clear all
Completed Phase 2 Interventional

Calcium and Vitamin D vs Markers of Adenomatous Polyps

NCT00208793
View directory record Official record
Conditions
Colorectal Adenomatous Polyps
Interventions
Calcium and vitamin D3 combined, Placebo, Calcium, Vitamin D3
Dietary Supplement · Drug
Lead sponsor
Emory University
Other
Eligibility
30 Years to 74 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2013
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 26, 2013 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional Results available

Treatment of Vitamin D Deficiency in Patients With Rheumatoid Arthritis

NCT01426347
View directory record Official record
Conditions
Rheumatoid Arthritis, Vitamin D Deficiency
Interventions
Placebo sugar pill, Ergocalciferol
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 75 Years
Enrollment
139 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 20, 2017 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Phase 2 Interventional

The Investigation of Vitamin D and Menstrual Cycles Trial, the inVitD Trial: A Phase II Clinical Trial

NCT05050916
View directory record Official record
Conditions
Reproductive Issues
Interventions
Vitamin D, Placebo
Dietary Supplement · Other
Lead sponsor
National Institute of Environmental Health Sciences (NIEHS)
NIH
Eligibility
19 Years to 40 Years · Female only
Enrollment
998 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
2
States / cities
Detroit, Michigan • Research Triangle Park, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 11, 2026 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

To Study the Nutri-Genomic Response of Vit-D Supplementation in African-Americans

NCT02802449
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
25 Hydroxy- Vitamin D3 [25 (OH) D3], Placebo
Drug
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
18 Years to 70 Years
Enrollment
330 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Feb 15, 2019 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Phase 4 Interventional Results available

Wheezing in Black Preterm Infants: Impact of Vitamin D Supplementation Strategy

NCT01601847
View directory record Official record
Conditions
Wheezing, Allergy
Interventions
Cholecalciferol, Cholecalciferol
Dietary Supplement · Drug
Lead sponsor
Case Western Reserve University
Other
Eligibility
Up to 1 Year
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
5
States / cities
New York, New York • Cleveland, Ohio • Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 8, 2018 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional

A Randomized Trial of Vitamin D Supplementation With or Without Vitamin A in Stem Cell Transplantation

NCT03202849
View directory record Official record
Conditions
Hematopoietic Stem Cell Transplant
Interventions
Vitamin D and A, Vitamin D and Placebo
Dietary Supplement
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
Not listed
Enrollment
83 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated May 12, 2023 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional Results available

Treatment of Hypovitaminosis D in Rheumatoid Arthritis

NCT00423358
View directory record Official record
Conditions
Rheumatoid Arthritis, Hypovitaminosis D
Interventions
Vitamin D, placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 90 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 24, 2015 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Magnesium and Vitamin D Supplementation and Cardiometabolic Outcomes

NCT03134417
View directory record Official record
Conditions
Overweight and Obesity, Vitamin D Deficiency, Magnesium Deficiency, Cardiovascular Risk Factor
Interventions
Vitamin D and magnesium, Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Drexel University
Other
Eligibility
30 Years to 70 Years
Enrollment
109 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 27, 2021 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans

NCT04939792
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D, Placebo, Vitamin D + L-cysteine, L-cysteine
Drug
Lead sponsor
Louisiana State University Health Sciences Center Shreveport
Other
Eligibility
18 Years to 65 Years
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Shreveport, Louisiana
Source: ClinicalTrials.gov public record
Updated Jun 8, 2023 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Large Randomized Trial of Vitamin D, Omega-3 Fatty Acids and Cognitive Decline

NCT01669915
View directory record Official record
Conditions
Cognitive Decline
Interventions
vitamin D3, omega-3 fatty acids (fish oil), Vitamin D3 placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
60 Years to 92 Years
Enrollment
3,424 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 21, 2023 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Interaction Between Calcium and Vitamin D Intake

NCT00762775
View directory record Official record
Conditions
Osteoporosis
Interventions
Calcium and vitamin D supplementation
Dietary Supplement
Lead sponsor
Winthrop University Hospital
Other
Eligibility
45 Years to 85 Years · Female only
Enrollment
78 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Dec 11, 2014 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Status and Dose Response in Infants

NCT01042561
View directory record Official record
Conditions
Vitamin D, Prematurity
Interventions
Vitamin D3, vitamin D3 placebo
Dietary Supplement
Lead sponsor
University of Nebraska
Other
Eligibility
5 Minutes to 3 Months
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 1, 2023 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Vitamin D and Calcium Homeostasis for Prevention of Type 2 Diabetes

NCT00436475
View directory record Official record
Conditions
Glucose Intolerance, Type 2 Diabetes Mellitus, Metabolic Syndrome
Interventions
Vitamin D3 2,000 IU orally once daily, Calcium Carbonate 400 mg orally twice daily, Vitamin D3-Placebo, Calcium-Placebo
Drug
Lead sponsor
Tufts Medical Center
Other
Eligibility
40 Years and older
Enrollment
92 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 30, 2019 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Phase 3 Interventional Results available

A Severity-Adapted Clinical Trial of Diminished Bone Mineral Density in Acute Lymphoblastic Leukemia Survivors

NCT00186901
View directory record Official record
Conditions
Leukemia, Lymphoblastic, Acute, Osteoporosis
Interventions
Calcium carbonate (Tums), vitamin D, Placebo
Drug · Other
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
Not listed
Enrollment
429 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2011
U.S. locations
3
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated May 10, 2017 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Phase 3 Interventional Results available

Second Study of the Effect of Teriparatide on Hip Fracture Healing

NCT01473602
View directory record Official record
Conditions
Femur Neck Fracture
Interventions
Teriparatide, Placebo, Calcium supplementation, Vitamin D supplementation
Drug · Dietary Supplement
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
50 Years and older
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
19
States / cities
San Diego, California • Golden, Colorado • Washington D.C., District of Columbia + 16 more
Source: ClinicalTrials.gov public record
Updated Apr 16, 2015 · Synced Oct 8, 2026, 6:57 PM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Immunotherapy After Transplantation for Skin Cancer Prevention in Organ Transplant Recipients

NCT04642287
View directory record Official record
Conditions
Immunotherapy, Cutaneous Squamous Cell Carcinoma, Actinic Keratoses, Organ Transplant Recipients, Skin Cancer
Interventions
Calcipotriol Only Product in Cutaneous Dose Form, Vaseline, Topical 5FU
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
50 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2030
U.S. locations
2
States / cities
Boston, Massachusetts • St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated May 7, 2025 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

The Effect of Vitamin D Statues on Endothelial Function

NCT01049048
View directory record Official record
Conditions
Cardiovascular Diseases, Vitamin D Deficiency
Interventions
Vitamin D3, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
55 Years to 65 Years · Female only
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 5, 2015 · Synced Oct 8, 2026, 6:57 PM EDT
Not listed Not applicable Interventional

Immunonutrition in Ulcerative Colitis

NCT03594708
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
Nutrition supplement, Placebo supplement
Dietary Supplement
Lead sponsor
Baptist Memorial Health Care Corporation
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 20, 2018 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional Results available

The VALIDATE-D Study

NCT01635062
View directory record Official record
Conditions
Type 2 Diabetes, Obesity
Interventions
Calcitriol, Placebo
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 11, 2017 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Phase 1 Interventional

Impact of Parathyroid Hormone (PTH) on Osseous Cavity

NCT00277706
View directory record Official record
Conditions
Bone Loss, Periodontitis
Interventions
Periodontal surgery, FORTEO, Placebo, Vitamin D and Calcium
Procedure · Drug · Dietary Supplement
Lead sponsor
University of Michigan
Other
Eligibility
30 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2009
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 7, 2009 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

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

NCT00920621
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated May 12, 2026 · Synced Oct 8, 2026, 6:57 PM EDT
Completed Not applicable Interventional

Diabetes Visual Function Supplement Study

NCT01646047
View directory record Official record
Conditions
Diabetes Mellitus - Type 1, Diabetes Mellitus - Type 2, Non-proliferative Diabetic Retinopathy
Interventions
multi-component nutritional supplement capsules, multi-component dietary supplement
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Jan 22, 2015 · Synced Oct 8, 2026, 6:57 PM EDT
Not listed Phase 2 Interventional

Effects of Vitamin D on Inflammation in Liver Disease

NCT01754961
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Dec 21, 2012 · Synced Oct 8, 2026, 6:57 PM EDT
Terminated Phase 4 Interventional

Clinical Effects of Vitamin D Repletion in Patients With Parkinson's Disease

NCT00571285
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Vitamin D3, Vitamin D3 - high dose, Placebo
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 89 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 24, 2017 · Synced Oct 8, 2026, 6:57 PM EDT