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ClinicalTrials.gov public records Last synced Oct 10, 2026, 2:03 PM EDT

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Showing 97–120 of 437 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D Placebo Clear all
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Averting Complications of Proton Pump Inhibitor Therapy by Effervescent Calcium Magnesium Citrate

NCT03812380
View directory record Official record
Conditions
Osteoporosis, Hypomagnesemia
Interventions
EffCaMgCit, Placebo
Drug · Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
21 Years to 99 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Aug 17, 2022 · Synced Oct 10, 2026, 2:03 PM EDT
Terminated Early Phase 1 Interventional

Effects of Vitamin D on Renin Expression in Hypertensive Patients

NCT00585442
View directory record Official record
Conditions
Hypertension, Vitamin D Deficiency
Interventions
calcitriol, Placebo
Drug
Lead sponsor
University of Utah
Other
Eligibility
55 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 27, 2016 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Phase 1 Interventional

Acute Effects of Canagliflozin, a Sodium Glucose Co-Transporter 2 (SGLT2) Inhibitor on Bone Metabolism in Healthy Volunteers

NCT02404870
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Placebo, Canagliflozin
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 4, 2025 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effectiveness of a Nutraceutical in Raising Circulating Serum Vitamin, Mineral and Amino Acid Levels in Patients.

NCT04054505
View directory record Official record
Conditions
Vitamin Deficiency
Interventions
EZPAK, Placebo
Dietary Supplement
Lead sponsor
Optimal Health Research
Other
Eligibility
26 Years to 75 Years
Enrollment
275 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jul 10, 2024 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Phase 4 Interventional

Supplementation in Adolescent Girls With Endometriosis

NCT02387931
View directory record Official record
Conditions
Endometriosis
Interventions
Vitamin D3, Fish Oil, Placebo
Dietary Supplement · Other
Lead sponsor
Boston Children's Hospital
Other
Eligibility
12 Years to 25 Years · Female only
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 1, 2016 · Synced Oct 10, 2026, 2:03 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 26, 2017 · Synced Oct 10, 2026, 2:03 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin K to Slow Progression of Dyslipidemia and Diabetes Risk (Vita-K 'n' Kids Study II)

NCT02959762
View directory record Official record
Conditions
Obesity, Insulin Resistance, Obesity in Diabetes, Nutritional and Metabolic Diseases, Hyperlipidemia, Hyperglycemia, Cardiovascular Diseases
Interventions
Placebo-Control, Low-Dose Vitamin K2 (menaquinone-7; 45-mcg/d), High-Dose Vitamin K2 (menaquinone-7; 90 mcg/d)
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
8 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 20, 2019 · Synced Oct 10, 2026, 2:03 PM EDT
Recruiting Early Phase 1 Interventional

Triamcinolone With Vitamin D Synergistic Efficacy in Psoriasis

NCT04036188
View directory record Official record
Conditions
Plaque Psoriasis, Vitamin D3
Interventions
Triamcinolone, Vitamin D3, Placebo
Drug · Dietary Supplement
Lead sponsor
Wright State University
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Fairborn, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 19, 2026 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

How Does Magnesium Status Influence Calcium Homeostasis?

NCT01593501
View directory record Official record
Conditions
Magnesium Deficiency, Calcium Metabolism Disorders
Interventions
vitamin D3
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
30 Years to 75 Years · Female only
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 1, 2016 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin D in Vulnerable Adults (VIVA-VA)

NCT01170273
View directory record Official record
Conditions
Frail Elderly, Vitamin d Deficiency
Interventions
vitamin D, placebo
Dietary Supplement
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
65 Years to 95 Years · Male only
Enrollment
130 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Dec 21, 2016 · Synced Oct 10, 2026, 2:03 PM 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 10, 2026, 2:03 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

VITAL-DEP: Depression Endpoint Prevention in the VITamin D and OmegA-3 TriaL

NCT01696435
View directory record Official record
Conditions
Depression, Depressive Symptoms, Mood
Interventions
vitamin D3, omega-3 fatty acids (fish oil), Fish oil placebo, Vitamin D placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
18,353 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 10, 2025 · Synced Oct 10, 2026, 2:03 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 10, 2026, 2:03 PM EDT
Terminated Phase 4 Interventional Results available

Vitamin D Deficiency in Patients With Hypertension

NCT00974922
View directory record Official record
Conditions
Vitamin D Deficiency, Hypertension
Interventions
Aliskiren, Cholecalciferol, Placebo
Drug · Dietary Supplement
Lead sponsor
UConn Health
Other
Eligibility
21 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 9, 2018 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Misoprostol Versus Dilapan-S for Cervical Preparation

NCT00835731
View directory record Official record
Conditions
Cervical Ripening
Interventions
misoprostol, Dilapan-S, vitamin B-12
Drug · Device
Lead sponsor
Planned Parenthood League of Massachusetts
Other
Eligibility
18 Years and older · Female only
Enrollment
125 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 23, 2017 · Synced Oct 10, 2026, 2:03 PM EDT
Terminated Phase 3 Interventional Results available

Fixation Using Alternative Implants for the Treatment of Hip Fractures (FAITH-2)

NCT01908751
View directory record Official record
Conditions
Femoral Neck Fractures
Interventions
Sliding Hip Screw, Cancellous Screws, Vitamin D, Vitamin D Placebo
Procedure · Drug
Lead sponsor
McMaster University
Other
Eligibility
18 Years to 60 Years
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
10
States / cities
Phoenix, Arizona • San Francisco, California • Gainesville, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Nov 30, 2020 · Synced Oct 10, 2026, 2:03 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Independent and Combined Effects of Resistance Exercise Training and β-hydroxy β-methylbutyrate Plus Vitamin D

NCT03848741
View directory record Official record
Conditions
Aging, Skeletal Muscle
Interventions
Non-Exercise Control, Resistance Exercise Training, Placebo, HMB+VitD
Behavioral · Dietary Supplement
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
45 Years to 60 Years · Female only
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Urbana, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 17, 2019 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Vitamin D in OUD: Exploration of Alterations on the Dopamine D2/D3 Receptor System

NCT06261905
View directory record Official record
Conditions
Opioid Use Disorder
Interventions
[11C]-PHNO, Calcitriol, Placebo Control, PET Scan
Drug · Dietary Supplement · Other + 1 more
Lead sponsor
Yale University
Other
Eligibility
18 Years to 50 Years
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 14, 2025 · Synced Oct 10, 2026, 2:03 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 10, 2026, 2:03 PM EDT
Completed Phase 4 Interventional Results available

Effect Of Risedronate On Bone Mass In Older Men Receiving Neoadjuvant Therapy For Prostate Cancer

NCT00859027
View directory record Official record
Conditions
Prostate Cancer
Interventions
risedronate, Placebo risedronate oral tablet
Drug
Lead sponsor
UConn Health
Other
Eligibility
55 Years to 85 Years · Male only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2009
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated May 1, 2018 · Synced Oct 10, 2026, 2:03 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 10, 2024 · Synced Oct 10, 2026, 2:03 PM EDT
Terminated Not applicable Interventional

High Dose Vitamin D Plus Multivitamin in the Prevention of Cluster Headache

NCT04570475
View directory record Official record
Conditions
Cluster Headache
Interventions
Vitamin D, multivitamin, Placebo
Dietary Supplement
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 70 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 6, 2025 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Phase 2 Interventional

A Study of Quintuple Therapy to Treat COVID-19 Infection

NCT04334512
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, Coronavirus-19, Sars-CoV2
Interventions
Hydroxychloroquine, Azithromycin, Vitamin C, Vitamin D, Zinc
Drug · Dietary Supplement
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
118 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Feb 29, 2024 · Synced Oct 10, 2026, 2:03 PM EDT
Completed Phase 3 Interventional

Osteoporosis Prevention After Heart Transplant

NCT00000412
View directory record Official record
Conditions
Osteoporosis, Cardiac Transplantation
Interventions
Alendronate, Calcitriol, Placebo Alendronate, Placebo Calcitriol
Drug
Lead sponsor
Columbia University
Other
Eligibility
20 Years to 70 Years
Enrollment
149 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 2002
U.S. locations
2
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 7, 2015 · Synced Oct 10, 2026, 2:03 PM EDT