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ClinicalTrials.gov public records Last synced Oct 14, 2026, 5:49 AM EDT

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Showing 121–144 of 437 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D placebo Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

Ergogenic Effects of Sportlegs

NCT06371521
View directory record Official record
Conditions
Performance Enhancing Product Use
Interventions
Sportlegs, Placebo
Dietary Supplement
Lead sponsor
Christopher Bell
Other
Eligibility
18 Years to 30 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 12, 2024 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Same-day Cervical Preparation Before Dilation and Evacuation

NCT03002441
View directory record Official record
Conditions
Cervical Dilation Prior to Dilation and Evacuation
Interventions
Same-Day Dilapan-S, Overnight Dilapan-S
Device
Lead sponsor
Planned Parenthood of Greater New York
Other
Eligibility
18 Years and older · Female only
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 22, 2021 · Synced Oct 14, 2026, 5:49 AM EDT
Withdrawn Not applicable Interventional

Vitamin D Status in Lower Extremity Joint Replacement Surgery Patients

NCT01858051
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 100 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 30, 2017 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Controlled Trial of Prenatal Vitamin D3 Supplementation to Prevent Vitamin D Deficiency in Mothers and Their Infants

NCT00610688
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Prenatal Vitamin, Cholecalciferol (Vitamin D3)
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
192 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 19, 2021 · Synced Oct 14, 2026, 5:49 AM EDT
Not listed Not applicable Interventional

Prospective Study of Adjunctive Carotenoids Plus Anti-oxidants in Anti-VEGF Treated Diabetic Macular Edema

NCT03866005
View directory record Official record
Conditions
Center-involved Diabetic Macular Edema (CI-DME)
Interventions
Diabetes Visual Function Study (DiVFuSS) softgels, canola oil placebo softgels, 2 per day
Dietary Supplement · Other
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
18 Years to 80 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
2
States / cities
Olympia, Washington • Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Jul 2, 2020 · Synced Oct 14, 2026, 5:49 AM EDT
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 14, 2026, 5:49 AM EDT
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 14, 2026, 5:49 AM EDT
Recruiting Phase 3 Interventional

Vitamin D for Prostate Endocrine Therapy

NCT05838716
View directory record Official record
Conditions
Stage I Prostate Cancer AJCC v8, Stage II Prostate Cancer AJCC v8, Stage III Prostate Cancer AJCC v8, Stage IVA Prostate Cancer AJCC v8
Interventions
Biospecimen Collection, D Vitamin, Dual X-ray Absorptiometry, Placebo Administration, Quality-of-Life Assessment, Questionnaire Administration
Procedure · Dietary Supplement · Drug + 1 more
Lead sponsor
University of Rochester
Other
Eligibility
50 Years and older · Male only
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
51
States / cities
Newark, Delaware • Danville, Illinois • Decatur, Illinois + 39 more
Source: ClinicalTrials.gov public record
Updated Jan 15, 2026 · Synced Oct 14, 2026, 5:49 AM EDT
Terminated Phase 1 Interventional

Randomized Study Of Exercise And Vitamin D In Frail Elderly Subjects

NCT00249704
View directory record Official record
Conditions
Elderly, Frail
Interventions
Vitamin D + Sham Exercise, Vitamin D Placebo + Exercise, Vitamin D Placebo + Sham Exercise, Vitamin D + Exercise
Drug · Procedure
Lead sponsor
Pfizer
Industry
Eligibility
75 Years and older
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
4
States / cities
Farmington, Connecticut • Hyattsville, Maryland • Roslindale, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 8, 2009 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Influenza Virus Vaccine Plus Vitamin A and D Supplements for Prevention of Respiratory Virus Infections in Children

NCT02649192
View directory record Official record
Conditions
Healthy Participants
Interventions
Influenza virus vaccine, Vitamins A and D, Placebo
Biological · Dietary Supplement · Other
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
2 Years to 8 Years
Enrollment
87 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 29, 2019 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D3 in Systemic Lupus Erythematosus

NCT00710021
View directory record Official record
Conditions
Systemic Lupus Erythematosus, SLE, Lupus
Interventions
Vitamin D3, Vitamin D3 placebo
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
8
States / cities
Birmingham, Alabama • San Francisco, California • Boston, Massachusetts + 5 more
Source: ClinicalTrials.gov public record
Updated Apr 26, 2017 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Magnesium Treatment on Vitamin D Metabolism in Participants Completed Personalized Prevention of Colorectal Cancer Trial

NCT03265483
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Magnesium glycinate, Placebo
Dietary Supplement
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
40 Years to 85 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 23, 2024 · Synced Oct 14, 2026, 5:49 AM EDT
Terminated Phase 2 Interventional Results available

Safety, Efficacy, PK and PD of CTAP101 (Calcifediol) ER Capsules for SHPT in HD Patients VDI

NCT03602261
View directory record Official record
Conditions
Secondary Hyperparathyroidism Due to Renal Causes, Chronic Kidney Diseases, Vitamin D Deficiency, Stage 5 Chronic Kidney Disease
Interventions
Calcifediol Oral Capsule, Placebo oral capsule
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
18
States / cities
Peoria, Arizona • Phoenix, Arizona • Cypress, California + 13 more
Source: ClinicalTrials.gov public record
Updated Apr 3, 2026 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Impact of Smoking Cessation and γ-Tocopherol to Restore Vascular Endothelial Function

NCT01314443
View directory record Official record
Conditions
Endothelial Dysfunction
Interventions
Nicotine Replacement Therapy (NRT), Gamma-Tocopherol, Placebo, Smoking cessation
Other · Dietary Supplement · Behavioral
Lead sponsor
University of Connecticut
Other
Eligibility
18 Years to 60 Years
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 21, 2015 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Phase 2 Interventional Results available

Efficacy and Safety Study of CD 2027 Spray in Subjects With Plaque-type Psoriasis

NCT00763555
View directory record Official record
Conditions
Psoriasis
Interventions
CD 2027, Calcitriol Vehicle
Drug
Lead sponsor
Galderma R&D
Industry
Eligibility
18 Years and older
Enrollment
88 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
2
States / cities
Fridley, Minnesota • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 23, 2022 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Not applicable Interventional

Role of Vitamin D in Secondary Prevention of Cardiovascular Events

NCT01018849
View directory record Official record
Conditions
Cardiovascular Disease
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
19 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
2
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Jan 15, 2016 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Changes in Breast Cancer Biomarkers Using Synergistic Prostaglandin Inhibitors

NCT01425476
View directory record Official record
Conditions
Breast Cancer
Interventions
Celecoxib, Placebo, Cholecalciferol
Drug
Lead sponsor
Hartford Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2016
U.S. locations
1
States / cities
Grand Forks, North Dakota
Source: ClinicalTrials.gov public record
Updated Aug 9, 2017 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Not applicable Interventional

Effect of Vitamin D in Diets of Preterm Infants

NCT01698840
View directory record Official record
Conditions
Premature Infants
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
Not listed
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 29, 2026 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Efficacy and Safety of Clear Skin Formula on Mitigating Mild to Moderate Non-cystic Acne

NCT05879406
View directory record Official record
Conditions
Non-Cystic Acne
Interventions
VitaMedica® Clear Skin Formula capsules, Placebo Capsules
Dietary Supplement · Other
Lead sponsor
Ablon Skin Institute Research Center
Other
Eligibility
18 Years to 40 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Manhattan Beach, California
Source: ClinicalTrials.gov public record
Updated Apr 6, 2025 · Synced Oct 14, 2026, 5:49 AM EDT
Withdrawn Phase 2 Interventional

Immunotherapy Before Transplantation for Skin Cancer Prevention in Organ Transplant Recipients

NCT04329221
View directory record Official record
Conditions
Cutaneous Squamous Cell Carcinoma, Actinic Keratoses, Skin Cancer, Organ Transplant Recipients, Immunotherapy
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
Healthy volunteers not accepted
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 14, 2026, 5:49 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 14, 2026, 5:49 AM 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 14, 2026, 5:49 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D, Diet and Activity Study

NCT01240213
View directory record Official record
Conditions
Breast Cancer, Obesity, Hypovitaminosis D
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
50 Years to 75 Years · Female only
Enrollment
218 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 7, 2013 · Synced Oct 14, 2026, 5:49 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Vitamins C and Vitamin E and Cardiovascular Risk

NCT00362518
View directory record Official record
Conditions
Diabetes
Interventions
Study Arm A, Study Arm B, Study Arm C, Study Arm D
Dietary Supplement
Lead sponsor
University of New Mexico
Other
Eligibility
18 Years to 75 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2008
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Mar 12, 2024 · Synced Oct 14, 2026, 5:49 AM EDT