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ClinicalTrials.gov public records Last synced Oct 4, 2026, 9:59 PM EDT

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Showing 49–72 of 326 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Oral vitamin D3 Clear all
Completed Phase 3 Interventional Results available

Prevention of Osteoporosis in Bone Marrow Transplantation (BMT) Patients

NCT00824993
View directory record Official record
Conditions
Hematological Malignancies
Interventions
Ibandronate, Vitamin Supplements
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2017
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 13, 2018 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Vitamin D Repletion in Chronic Kidney Disease

NCT00772772
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Vitamin D3
Drug
Lead sponsor
Rockefeller University
Other
Eligibility
50 Years to 80 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 15, 2015 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans

NCT04939792
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D, Placebo, Vitamin D + L-cysteine, L-cysteine
Drug
Lead sponsor
Louisiana State University Health Sciences Center Shreveport
Other
Eligibility
18 Years to 65 Years
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Shreveport, Louisiana
Source: ClinicalTrials.gov public record
Updated Jun 8, 2023 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 1 Interventional

Calcitriol Plus Paclitaxel in Treating Patients With Advanced Solid Tumors

NCT00009802
View directory record Official record
Conditions
Unspecified Adult Solid Tumor, Protocol Specific
Interventions
calcitriol, paclitaxel
Dietary Supplement · Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2005
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 19, 2013 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy Trial With Zoledronic Acid for the Treatment of Paget's Disease of Bone, Including an Extended Observation Period

NCT00103740
View directory record Official record
Conditions
Paget's Disease of Bone
Interventions
zoledronic acid, placebo to zoledronic acid, Risedronate, Placebo to risedronate, Calcium and vitamin D supplements
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
30 Years and older
Enrollment
185 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2011
U.S. locations
10
States / cities
Tucson, Arizona • Colorado Springs, Colorado • Indianapolis, Indiana + 7 more
Source: ClinicalTrials.gov public record
Updated Jun 4, 2012 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 2 Interventional

A Phase 2 Study of an Oral Vitamin D Compound (DP001) in Secondary Hyperparathyroidism in Patients on Hemodialysis

NCT01922843
View directory record Official record
Conditions
Hyperparathyroidism, Secondary, Kidney Failure, Chronic
Interventions
DP001 softgel capsules, Placebo
Drug
Lead sponsor
Deltanoid Pharmaceuticals
Industry
Eligibility
18 Years and older
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
14
States / cities
Phoenix, Arizona • Tucson, Arizona • Washington D.C., District of Columbia + 11 more
Source: ClinicalTrials.gov public record
Updated Aug 18, 2017 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy Trial With Zoledronic Acid for the Treatment of Paget's Disease of Bone, Including an Extended Observation Period

NCT00051636
View directory record Official record
Conditions
Paget's Disease of Bone
Interventions
Zoledronic Acid, Risedronate, Placebo to Risedronate, Placebo to Zoledronic Acid, Calcium and Vitamin D
Drug · Dietary Supplement
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
30 Years and older
Enrollment
172 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2011
U.S. locations
12
States / cities
Santa Monica, California • Lakewood, Colorado • Boca Raton, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated May 15, 2012 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Not applicable Interventional Results available

Modulation of Breast Cancer Risk Biomarkers by High Dose Vitamin D

NCT01166763
View directory record Official record
Conditions
Breast Cancer
Interventions
vitamin D3
Drug
Lead sponsor
Carol Fabian, MD
Other
Eligibility
Up to 55 Years · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jul 18, 2016 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 2 Interventional Results available

Vitamin D Dose Finding Study

NCT01092338
View directory record Official record
Conditions
HIV Infections, AIDS
Interventions
Cholecalciferol (Vit D3)
Drug
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
5 Years to 24 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 18, 2013 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Magnesium and Vitamin D Supplementation and Cardiometabolic Outcomes

NCT03134417
View directory record Official record
Conditions
Overweight and Obesity, Vitamin D Deficiency, Magnesium Deficiency, Cardiovascular Risk Factor
Interventions
Vitamin D and magnesium, Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Drexel University
Other
Eligibility
30 Years to 70 Years
Enrollment
109 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 27, 2021 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Vitamin D and Calcium on Genes in the Colon

NCT00298545
View directory record Official record
Conditions
Colorectal Polyps, Colorectal Adenoma, Adenocarcinoma
Interventions
placebo and Calcitriol, Calcium and Calcitriol
Drug
Lead sponsor
Rockefeller University
Other
Eligibility
48 Years to 72 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2009
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 18, 2011 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 2 Interventional Results available

A Study in Adult Patients With Type I, III or IV Osteogenesis Imperfecta Treated With BPS804

NCT03118570
View directory record Official record
Conditions
Osteogenesis Imperfecta, Type I, Osteogenesis Imperfecta Type III, Osteogenesis Imperfecta Type IV
Interventions
setrusumab, Calcium, Vitamin D, zoledronic acid (optional)
Drug · Dietary Supplement
Lead sponsor
Ultragenyx Pharmaceutical Inc
Industry
Eligibility
18 Years to 75 Years
Enrollment
112 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
12
States / cities
Birmingham, Alabama • Jacksonville, Florida • Baltimore, Maryland + 9 more
Source: ClinicalTrials.gov public record
Updated Jul 5, 2023 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Not applicable Interventional Results available

Open-label Vitamin D Trial for Patients With Cystic Fibrosis and Allergic Bronchopulmonary Aspergillosis

NCT01222273
View directory record Official record
Conditions
Cystic Fibrosis, Allergic Bronchopulmonary Aspergillosis
Interventions
cholecalciferol (Vitamin D3)
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
12 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
2
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 29, 2018 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Not applicable Interventional Results available

Vitamin D Supplementation on Cardiovascular Risk Factors

NCT01412710
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Cholecalciferol
Drug
Lead sponsor
Florida International University
Other
Eligibility
30 Years to 70 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Dec 12, 2017 · Synced Oct 4, 2026, 9:59 PM EDT
Not listed Not applicable Interventional

Effect of Vitamin D Status and Repletion on Postoperative Total Joint Arthroplasty Complications

NCT04229368
View directory record Official record
Conditions
Hip Arthropathy, Knee Arthropathy, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
900 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 16, 2023 · Synced Oct 4, 2026, 9:59 PM EDT
Terminated Phase 3 Interventional

A Phase III Study to Investigate if the Study Drug Diamyd Can Preserve Insulin Production and Improve Glycemic Control in Patients Newly Diagnosed With Type 1 Diabetes

NCT05018585
View directory record Official record
Conditions
Type 1 Diabetes Mellitus
Interventions
Recombinant human glutamic acid decarboxylase (rhGAD65) formulated in Alhydrogel®, Colecalciferol 2000 IU, Placebo
Biological · Dietary Supplement
Lead sponsor
Diamyd Medical AB
Industry
Eligibility
12 Years to 28 Years
Enrollment
321 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
13
States / cities
Newport Beach, California • Palo Alto, California • San Diego, California + 10 more
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

A Single Wintertime Dose of Vitamin D3 to Prevent Winter Decline in Vitamin D Status in Healthy Adults

NCT01924910
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
250,000 IU cholecalciferol as single, oral dose, Placebo
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 65 Years
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jul 13, 2017 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Low vs. Moderate to High Dose Vitamin D for Prevention of COVID-19

NCT04868903
View directory record Official record
Conditions
SARS-CoV-2 Infection
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
1,475 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
2
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 22, 2026 · Synced Oct 4, 2026, 9:59 PM EDT
Withdrawn Phase 3 Interventional

Therapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures.

NCT02138591
View directory record Official record
Conditions
Vitamin d Deficiency
Interventions
Blood draw pre-operatively, Blood draw post-operative Day 1, Blood draw post-operative Day 2
Procedure
Lead sponsor
University of Missouri, Kansas City
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 16, 2017 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Not applicable Interventional

DAILY: Vitamin D, Aspirin, ExercIse, Low Saturated Fat Foods StudY in Colorectal Cancer Patients With Minimal Residual Disease

NCT05036109
View directory record Official record
Conditions
Colorectal Cancer, Colon Cancer
Interventions
Aspirin, Vitamin D, Diet, Physical Activity, Behavioral Support Counseling Sessions
Drug · Dietary Supplement · Other + 1 more
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 10, 2026 · Synced Oct 4, 2026, 9:59 PM EDT
Completed Phase 2Phase 3 Interventional

Vitamin D Supplementation for Extremely Preterm Infants

NCT01600430
View directory record Official record
Conditions
Vitamin D Deficiency, Preterm Infants, Bronchopulmonary Dysplasia
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
1 Minute to 7 Days
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Feb 10, 2017 · Synced Oct 4, 2026, 9:59 PM EDT
Terminated Phase 1 Interventional

Effect of High-Dose Vitamin D3 in Smokers and Non-Smokers With and Without HIV

NCT03270709
View directory record Official record
Conditions
HIV/AIDS, Vitamin D Deficiency, Smoker Lung
Interventions
Vitamin D3 450,000 IU orally
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 21, 2021 · Synced Oct 4, 2026, 9:59 PM 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 4, 2026, 9:59 PM EDT
Completed Not applicable Interventional

Pilot Study of Vitamin K2 (MK-7) and Vitamin D3 Supplementation and the Effects on PASC Symptomatology and Inflammatory Biomarkers

NCT05356936
View directory record Official record
Conditions
Post-acute COVID-19 Syndrome
Interventions
Vitamin K2 (MK-7), Vitamin D3
Dietary Supplement
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
151 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 27, 2024 · Synced Oct 4, 2026, 9:59 PM EDT