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ClinicalTrials.gov public records Last synced Oct 1, 2026, 11:36 AM EDT

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Showing 25–48 of 181 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Vitamin D Supplementation Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Omega-3 Supplementation and Mental Health in College Students

NCT07391254
View directory record Official record
Conditions
Mental Health, Vitamin D
Interventions
Placebo, Low dose Omega 3, High dose Omega 3
Dietary Supplement
Lead sponsor
University of Colorado, Colorado Springs
Other
Eligibility
18 Years to 27 Years
Enrollment
103 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Colorado Springs, Colorado
Source: ClinicalTrials.gov public record
Updated Mar 10, 2026 · Synced Oct 1, 2026, 11:36 AM EDT
Terminated Not applicable Interventional

Vitamin D Supplementation in IBS

NCT03148288
View directory record Official record
Conditions
Irritable Bowel Syndrome, Vitamin D Deficiency, Abdominal Pain
Interventions
Vitamin D, placebo
Dietary Supplement
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 6, 2020 · Synced Oct 1, 2026, 11:36 AM EDT
Active, not recruiting Phase 3 Interventional Results available

Vitamin D3 With Chemotherapy and Bevacizumab in Treating Patients With Advanced or Metastatic Colorectal Cancer

NCT04094688
View directory record Official record
Conditions
Colorectal Adenocarcinoma
Interventions
Bevacizumab, Oxaliplatin, Leucovorin Calcium, Fluorouracil, Irinotecan Hydrochloride, Irinotecan, Cholecalciferol, Quality-of-Life Assessment, Questionnaire Administration
Drug · Dietary Supplement · Other
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
18 Years and older
Enrollment
455 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1027
States / cities
Birmingham, Alabama • Anchorage, Alaska • Fairbanks, Alaska + 676 more
Source: ClinicalTrials.gov public record
Updated Mar 3, 2026 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D Supplementation on Cardiac Structure and Function

NCT01630213
View directory record Official record
Conditions
Cardiovascular Disease
Interventions
Vitamin D3 + fish oil/fish oil placebo, Vitamin D3 placebo + fish oil/fish oil placebo
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
50 Years and older
Enrollment
1,025 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 6, 2022 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Phase 2 Interventional Results available

Study of Vitamin D and Effect on Heart Disease and Insulin Resistance

NCT01093417
View directory record Official record
Conditions
Human Immunodeficiency Virus (HIV), Vitamin D Deficiency, HIV Infections
Interventions
Vitamin D, Placebo
Drug · Other
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 14, 2016 · Synced Oct 1, 2026, 11:36 AM 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 1, 2026, 11:36 AM 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 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy of Nutritional Supplementation on Physical-activity Mediated Changes in Physical Functioning Older Adults at Risk for Mobility Disability (The VIVE2 Study)

NCT01542892
View directory record Official record
Conditions
Sarcopenia
Interventions
Exercise Intervention, Supplement Intervention
Other · Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
70 Years and older
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 18, 2014 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Phase 4 Interventional Results available

Impact on Reducing the Incidence of Low Serum Calcium by Providing Educational Materials on the Need to Take Daily Supplemental Calcium and Vitamin D to Patients With Paget's Disease Treated With Reclast®

NCT00668200
View directory record Official record
Conditions
Paget's Disease of the Bone, Hypocalcemia
Interventions
Reclast (ZOL446, zoledronic acid), Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
Not listed
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
9
States / cities
Phoenix, Arizona • Tucson, Arizona • Gainesville, Georgia + 6 more
Source: ClinicalTrials.gov public record
Updated Mar 6, 2015 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin D Supplementation in HIV Youth

NCT01523496
View directory record Official record
Conditions
HIV Infections
Interventions
Vitamin D control dose, Vitamin D supplementation-
Drug
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
8 Years to 25 Years
Enrollment
190 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
2
States / cities
Atlanta, Georgia • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 8, 2018 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional

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

NCT01141192
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Jun 10, 2010 · Synced Oct 1, 2026, 11:36 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

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

NCT01785004
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Apr 13, 2021 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Pilot Pharmacokinetic Study of Daily Versus Monthly High-Dose Cholecalciferol Supplementation

NCT01079923
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Single High Dose Cholecalciferol, Daily Dose Cholecalciferol
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Nov 20, 2012 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional

Effect of Vitamin D Supplementation on Hemoglobin A1c in Patients With Uncontrolled Type 2 Diabetes Mellitus

NCT00985361
View directory record Official record
Conditions
Type 2 Diabetes Mellitus
Interventions
Vitamin D3 2000 international units daily, Vitamin C 500mg daily
Dietary Supplement
Lead sponsor
ProMedica Health System
Other
Eligibility
21 Years to 75 Years
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
3
States / cities
Sylvania, Ohio • Toledo, Ohio
Source: ClinicalTrials.gov public record
Updated May 6, 2010 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety of Vitamin D Supplementation in Older Persons

NCT00681590
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol (vitamin D)
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
65 Years to 95 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jan 26, 2017 · Synced Oct 1, 2026, 11:36 AM EDT
Not listed Not applicable Interventional

Vitamin D in Pediatric Asthma: a Randomized Controlled Open-label Pilot Trial

NCT02054975
View directory record Official record
Conditions
Asthma, Vitamin D Deficiency
Interventions
Vitamin D2 + vitamin D3, Vitamin D3
Drug
Lead sponsor
Nationwide Children's Hospital
Other
Eligibility
8 Years to 17 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 8, 2015 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional Results available

Vitamin D in Minorities With Prediabetes

NCT00876928
View directory record Official record
Conditions
Pre-diabetes
Interventions
vitamin D, placebo
Drug
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
18 Years to 90 Years
Enrollment
117 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 14, 2013 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Vitamin D Supplementation and Muscle Function in Older Adults

NCT02015611
View directory record Official record
Conditions
Neuromuscular Function
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
65 Years to 89 Years
Enrollment
136 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 15, 2022 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D Supplementation on Bone Turnover Markers During PrEP in MSM

NCT02367599
View directory record Official record
Conditions
Patient Adherence
Interventions
Vitamin D Supplement
Drug
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older · Male only
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
3
States / cities
Los Angeles, California • San Diego, California • Torrance, California
Source: ClinicalTrials.gov public record
Updated Jul 2, 2020 · Synced Oct 1, 2026, 11:36 AM EDT
Not yet recruiting Phase 2 Interventional

HMB Plus Vitamin D to Preserve Muscle in Older Adults Starting Semaglutide

NCT07760948
View directory record Official record
Conditions
Type 2 Diabetes Mellitus (T2DM), Sarcopenia, Obesity, Muscle Loss, Older Adults
Interventions
Calcium-HMB Plus Vitamin D3, Matching placebo
Dietary Supplement · Other
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
65 Years to 85 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 1, 2026, 11:36 AM EDT
Not listed Not applicable Interventional

Vitamin D Supplementation and TB

NCT01992263
View directory record Official record
Conditions
Tuberculosis, Vitamin D, Immunity
Interventions
Vitamin D (600 IU), Vitamin D (2000 IU), Vitamin D (4000 IU), Placebo
Dietary Supplement · Other
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 60 Years
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Sep 9, 2020 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Impact of Vitamin D Supplementation on Lactation Associated Bone Loss

NCT00903344
View directory record Official record
Conditions
Osteoporosis
Interventions
Vitamin D3, Multivitamin
Drug · Dietary Supplement
Lead sponsor
Leigh Eck, MD
Other
Eligibility
18 Years and older · Female only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Aug 18, 2014 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D Supplementation During Pregnancy on Clinical Outcomes and Immune Function

NCT01417351
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
400 IU vitamin D3, 2,000 IU Vitamin D3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 45 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
2
States / cities
Davis, California • Sacramento, California
Source: ClinicalTrials.gov public record
Updated Jul 23, 2013 · Synced Oct 1, 2026, 11:36 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Improving the Understanding of the Response to Vitamin D Supplementation

NCT01465178
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
50 Years to 100 Years · Female only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 25, 2016 · Synced Oct 1, 2026, 11:36 AM EDT