Independent directory Public ClinicalTrials.gov records United States
Clinical Trials Finder
Objective public record navigation
Search Results

Search by objective public record fields.

Search by query text, NCT ID, condition, intervention, sponsor, city, state, recruitment status, phase, study type, healthy volunteer eligibility, sex, or age. Results are retrieved from ClinicalTrials.gov and synchronized into the directory. Search pages remain noindex by default.

Clear filters
ClinicalTrials.gov public records Last synced Sep 26, 2026, 2:04 PM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 1–24 of 262 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Placebo for vitamin D3 Clear all
Completed Not applicable Interventional

S0812 High Dose Cholecalciferol in Premenopausal Women at High-Risk for Breast Cancer

NCT01097278
View directory record Official record
Conditions
brca1 Mutation Carrier, brca2 Mutation Carrier, Breast Cancer
Interventions
cholecalciferol, placebo
Dietary Supplement · Other
Lead sponsor
SWOG Cancer Research Network
Network
Eligibility
18 Years to 50 Years · Female only
Enrollment
208 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
360
States / cities
Anniston, Alabama • Mobile, Alabama • Anchorage, Alaska + 230 more
Source: ClinicalTrials.gov public record
Updated Nov 23, 2017 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 2 Interventional

Vitamin D to Slow Progression of Knee Osteoarthritis

NCT00306774
View directory record Official record
Conditions
Osteoarthritis, Knee
Interventions
Vitamin D (cholecalciferol), Placebo
Dietary Supplement
Lead sponsor
Tufts Medical Center
Other
Eligibility
45 Years to 90 Years
Enrollment
146 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 22, 2011 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Is Treatment of Vitamin D Deficiency Associated With Resolution of Statin-Induced Muscular Symptoms

NCT01568255
View directory record Official record
Conditions
Myopathic Symptoms
Interventions
Ergocalciferol, Placebo
Drug
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2019
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 9, 2021 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

A Study of Hydroxychloroquine, Vitamin C, Vitamin D, and Zinc for the Prevention of COVID-19 Infection

NCT04335084
View directory record Official record
Conditions
COVID-19, Coronavirus Infection, Sars-CoV2, Corona Virus Infection, COVID, Coronavirus, Coronavirus-19, Coronavirus 19
Interventions
Hydroxychloroquine, Vitamin C, Vitamin D, Zinc
Drug · Dietary Supplement
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
254 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Jun 4, 2025 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Rayaldee for Treating Mild to Moderate COVID-19

NCT04551911
View directory record Official record
Conditions
COVID-19, Coronavirus, SARS-CoV2 Infection
Interventions
Rayaldee, Placebo
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
10
States / cities
San Francisco, California • Miami, Florida • Evanston, Illinois + 6 more
Source: ClinicalTrials.gov public record
Updated May 27, 2024 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 2 Interventional Results available

Intralesional Vitamin D Injection for Treatment of Common Warts

NCT04278573
View directory record Official record
Conditions
Warts
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
Stephen P. Merry
Other
Eligibility
18 Years and older
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 29, 2024 · Synced Sep 26, 2026, 2:04 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 15, 2015 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 2 Interventional Results available

High Dose Vitamin D for Sickle Cell Disease

NCT01331148
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Vitamin D, Placebo
Drug · Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
7 Years to 21 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 8, 2022 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 3 Interventional

Hepatic Dysfunction, Vitamin D Status, and Glycemic Control in Diabetes

NCT02132442
View directory record Official record
Conditions
Type 2 Diabetes, Nonalcoholic Fatty Liver Disease, Vitamin D Deficiency
Interventions
Ergocalciferol, placebo
Dietary Supplement
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
10 Years to 50 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 9, 2017 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Not applicable Interventional

Vitamin D for Muscle Metabolic Function in Cancer Cachexia

NCT03144128
View directory record Official record
Conditions
Cancer Cachexia, Vitamin D Deficiency
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
David Travis Thomas
Other
Eligibility
45 Years to 75 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Oct 13, 2020 · Synced Sep 26, 2026, 2:04 PM 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 14, 2026 · Synced Sep 26, 2026, 2:04 PM EDT
Terminated Not applicable Interventional

Vitamin D to Improve Nutrition Prior to Bariatric Surgery and Investigate the Relationship With Negative Outcomes

NCT02212652
View directory record Official record
Conditions
Vitamin D Deficiency, Vitamin D Insufficiency
Interventions
Vitamin D, Placebo, Standard of Care
Dietary Supplement · Other
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 64 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 5, 2019 · Synced Sep 26, 2026, 2:04 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 16, 2014 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Alendronate (Fosamax) in Children With Osteoporosis

NCT00259857
View directory record Official record
Conditions
Osteoporosis
Interventions
Alendronate
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
5 Years to 15 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2009
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jan 18, 2011 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Vitamin D and Residual Beta-Cell Function in Type 1 Diabetes

NCT03046927
View directory record Official record
Conditions
Type 1 Diabetes
Interventions
Ergocalciferol, Placebo
Drug · Other
Lead sponsor
Benjamin U. Nwosu, MD
Other
Eligibility
10 Years to 21 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 9, 2024 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Effects of Anorexia Nervosa on Peak Bone Mass

NCT01301183
View directory record Official record
Conditions
Anorexia Nervosa
Interventions
RhIGF-1 with transdermal 17-beta estradiol, Placebo and transdermal 17-beta estradiol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
14 Years to 22 Years · Female only
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 12, 2021 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Not applicable Interventional Results available

D Vitamin Intervention in VA

NCT01375660
View directory record Official record
Conditions
Impaired Fasting Glucose, Impaired Glucose Tolerance, Vitamin D Insufficiency
Interventions
Placebo, 50K vitamin D2
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
35 Years to 85 Years · Male only
Enrollment
205 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 5, 2015 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

CYP3A4 Activity and Mineral Homeostasis

NCT02019875
View directory record Official record
Conditions
Vitamin D and Calcium Homeostasis
Interventions
Rifampin, Clarithromycin, Grapefruit Juice, Placebo
Drug · Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 60 Years
Enrollment
92 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2020
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Apr 18, 2023 · Synced Sep 26, 2026, 2:04 PM EDT
Not listed Early Phase 1 Interventional Accepts healthy volunteers

Periodontal and Cardiometabolic Responses to Vitamin D Intervention in African Americans With Periodontal Disease

NCT02337257
View directory record Official record
Conditions
Periodontal Disease, Vitamin D Deficiency
Interventions
Cholecalciferol, Placebo
Drug
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 60 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 12, 2015 · Synced Sep 26, 2026, 2:04 PM EDT
Recruiting Not applicable Interventional

Evaluation of the Clinical and Psychological Impact of Vitamin D Replacement in Adolescent Females at Risk for Polycystic Ovarian Syndrome (PCOS)

NCT04355572
View directory record Official record
Conditions
Polycystic Ovarian Syndrome in Adolescent Females, Vitamin D Deficiency
Interventions
Vitamin D 4000IU daily, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
13 Years to 21 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 19, 2026 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 3 Interventional

Supplementation With Vitamin D, Calcium or Both on Calcium Absorption and Bone Mineral Content in Children With JRA

NCT00570934
View directory record Official record
Conditions
Juvenile Rheumatoid Arthritis
Interventions
Cholecalciferol, Calcium, Calcium and cholecalciferol, Placebo
Dietary Supplement · Drug
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
3 Years to 15 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1995 – 2002
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Oct 9, 2016 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 3 Interventional Results available

Effectiveness of Paricalcitol in Reducing Parathyroid Hormone (PTH) Levels in X-linked Hypophosphatemic Rickets

NCT00417612
View directory record Official record
Conditions
Hypophosphatemia, Familial, Hyperparathyroidism
Interventions
Paricalcitol, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
9 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 16, 2020 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Vitamin D and Fish Oil for Autoimmune Disease, Inflammation and Knee Pain

NCT01351805
View directory record Official record
Conditions
Autoimmune Diseases, Systemic Inflammatory Process, Knee Pain Chronic, Osteoarthritis, Rheumatoid Arthritis
Interventions
Fish Oil, Vitamin D, placebo pill
Drug · Dietary Supplement · Other
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
25,871 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 2, 2025 · Synced Sep 26, 2026, 2:04 PM EDT
Completed Phase 2 Interventional

Vitamin D3 Supplementation for Heart Failure Patients

NCT01636570
View directory record Official record
Conditions
Heart Failure, Vitamin D Deficiency, Cardiomyopathy, Congestive Heart Failure
Interventions
Placebo Comparator: Sugar Pill, Vitamin D3 (cholecalciferol)
Drug
Lead sponsor
Heidi Moretti, MS, RD
Other
Eligibility
Not listed
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
2
States / cities
Missoula, Montana
Source: ClinicalTrials.gov public record
Updated Apr 25, 2017 · Synced Sep 26, 2026, 2:04 PM EDT