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ClinicalTrials.gov public records Last synced Sep 30, 2026, 1:22 AM EDT

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Showing 25–48 of 436 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D Placebo Clear all
Completed Phase 2 Interventional

Effects of MEDI-522 On Disease Activity and Progression of Joint Damage in Patients With Active Rheumatoid Arthritis Suboptimally Responding to Methotrexate

NCT00069017
View directory record Official record
Conditions
Rheumatoid Arthritis
Interventions
MEDI-522, Placebo
Biological · Other
Lead sponsor
MedImmune LLC
Industry
Eligibility
18 Years and older
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2006
U.S. locations
29
States / cities
Birmingham, Alabama • Glendale, Arizona • Phoenix, Arizona + 24 more
Source: ClinicalTrials.gov public record
Updated Nov 27, 2007 · Synced Sep 30, 2026, 1:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of a Nitric Oxide Supplementation Product on Endothelial Dysfunction and Prehypertensive Adults

NCT03895749
View directory record Official record
Conditions
Hypertension
Interventions
NEO40 Daily
Dietary Supplement
Lead sponsor
Hypertension Institute, Nashville
Other
Eligibility
18 Years to 75 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 30, 2019 · Synced Sep 30, 2026, 1:22 AM EDT
Completed Phase 4 Interventional Results available

VERtebral Fracture Treatment Comparisons in Osteoporotic Women

NCT01709110
View directory record Official record
Conditions
Postmenopausal Osteoporosis
Interventions
Teriparatide, Risedronate, Placebo, Calcium, Vitamin D
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
45 Years and older · Female only
Enrollment
1,366 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
30
States / cities
Birmingham, Alabama • Concord, California • Fresno, California + 27 more
Source: ClinicalTrials.gov public record
Updated Sep 23, 2019 · Synced Sep 30, 2026, 1:22 AM 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 Sep 30, 2026, 1:22 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

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

NCT01653678
View directory record Official record
Conditions
Hypertension
Interventions
Vitamin D-3 (cholecalciferol), 2000 IU, Omega-3 fatty acids (fish oil), Vitamin D placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years to 99 Years
Enrollment
25,875 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 18, 2025 · Synced Sep 30, 2026, 1:22 AM EDT
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 24, 2017 · Synced Sep 30, 2026, 1:22 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 Sep 30, 2026, 1:22 AM 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 Sep 30, 2026, 1:22 AM EDT
Withdrawn Phase 1Phase 2 Interventional

Tele-health Enabled Clinical Trial for COVID-19

NCT04489628
View directory record Official record
Conditions
SARS-CoV Infection
Interventions
Vitamin D3 or Placebo, Doctella telehealth monitoring
Drug · Device
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 7, 2022 · Synced Sep 30, 2026, 1:22 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin D3 Supplementation for Vitamin D Deficiency in Rotator Cuff Repair Surgery

NCT05009498
View directory record Official record
Conditions
Vitamin D Deficiency, Rotator Cuff Tears
Interventions
Vitamin D3 supplementation, Placebo
Dietary Supplement · Other
Lead sponsor
Community Memorial Health System
Other
Eligibility
18 Years to 65 Years
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
2
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Aug 17, 2021 · Synced Sep 30, 2026, 1:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Calcium Supplement Particle Size and Vitamin D Supplement on Calcium Retention in Adolescent Girls

NCT01005381
View directory record Official record
Conditions
Osteoporosis
Interventions
Small Particle Size Calcium Carbonate Supplement, Large Particle Size Calcium Carbonate Supplement, Vitamin D, Calcium Placebo
Dietary Supplement
Lead sponsor
Purdue University
Other
Eligibility
12 Years to 14 Years · Female only
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 9, 2018 · Synced Sep 30, 2026, 1:22 AM EDT
Completed Phase 2 Interventional Results available

Statin/Vitamin D & Migraine Study

NCT01225263
View directory record Official record
Conditions
Migraine
Interventions
Simvastatin, Vitamin D, Placebo
Drug · Dietary Supplement · Other
Lead sponsor
Rami Burstein
Other
Eligibility
18 Years and older
Enrollment
89 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 26, 2016 · Synced Sep 30, 2026, 1:22 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 Sep 30, 2026, 1:22 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 Sep 30, 2026, 1:22 AM 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 17, 2014 · Synced Sep 30, 2026, 1:22 AM 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 17, 2020 · Synced Sep 30, 2026, 1:22 AM EDT
Completed Not applicable Interventional Results available

Pilot Trial to Evaluate the Effect of Vitamin D on Melanocyte Biomarkers

NCT01477463
View directory record Official record
Conditions
Melanoma, Skin
Interventions
Vitamin D3, placebo and vitamin D
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 75 Years · Female only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Dec 23, 2016 · Synced Sep 30, 2026, 1:22 AM 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 Sep 30, 2026, 1:22 AM 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 19, 2023 · Synced Sep 30, 2026, 1:22 AM EDT
Terminated Phase 4 Interventional

Sustainability of Vitamin D Levels After Repletion With Ergocalciferol In Chronic Kidney Disease Stage 5D

NCT01312441
View directory record Official record
Conditions
Vitamin D Deficiency, Renal Failure Chronic Requiring Hemodialysis
Interventions
Ergocalciferol, Placebo
Drug
Lead sponsor
Albany College of Pharmacy and Health Sciences
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
4
States / cities
Albany, New York • Clifton Park, New York • Saratoga Springs, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 14, 2016 · Synced Sep 30, 2026, 1:22 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 Sep 30, 2026, 1:22 AM 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 6, 2019 · Synced Sep 30, 2026, 1:22 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D3 for Aromatase Inhibitor Induced Arthralgias

NCT00867217
View directory record Official record
Conditions
Breast Cancer
Interventions
High Dose Vitamin D, Placebo, Standard Dose Vitamin D3, Letrozole 2.5mg
Dietary Supplement · Drug
Lead sponsor
Qamar Khan
Other
Eligibility
18 Years and older · Female only
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
2
States / cities
Westwood, Kansas • Wichita, Kansas
Source: ClinicalTrials.gov public record
Updated Feb 9, 2018 · Synced Sep 30, 2026, 1:22 AM EDT
Terminated Phase 2 Interventional Results available

Vitamin D to Prevent Severe Asthma Exacerbations (Vit-D-Kids Asthma)

NCT02687815
View directory record Official record
Conditions
Asthma
Interventions
vitamin D3 4000 IU, Placebo
Drug
Lead sponsor
Juan Celedon, MD
Other
Eligibility
6 Years to 16 Years
Enrollment
192 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
7
States / cities
San Francisco, California • Denver, Colorado • Boston, Massachusetts + 4 more
Source: ClinicalTrials.gov public record
Updated Aug 12, 2021 · Synced Sep 30, 2026, 1:22 AM EDT