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ClinicalTrials.gov public records Last synced Oct 14, 2026, 2:20 PM EDT

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Showing 289–312 of 326 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Oral vitamin D3 Clear all
Completed Phase 3 Interventional Results available

Zoledronate, Vitamin D, and Calcium With or Without Strontium 89 or Samarium 153 in Preventing or Delaying Bone Problems in Patients With Bone Metastases From Prostate Cancer, Lung Cancer, or Breast Cancer

NCT00365105
View directory record Official record
Conditions
Breast Cancer, Lung Cancer, Metastatic Cancer, Pain, Prostate Cancer
Interventions
Calcium, Vitamin D, zoledronic acid, Sm-153, Sr-89
Dietary Supplement · Drug · Radiation
Lead sponsor
Radiation Therapy Oncology Group
Network
Eligibility
18 Years and older
Enrollment
261 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2017
U.S. locations
147
States / cities
Mobile, Alabama • Burbank, California • Carmichael, California + 116 more
Source: ClinicalTrials.gov public record
Updated Sep 20, 2024 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Phase 4 Interventional

Vitamin D Deficiency in Chronic Kidney Disease (CKD) Patients

NCT00958451
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions
Paricalcitol, Ergocalciferol
Drug
Lead sponsor
Salem Veterans Affairs Medical Center
Federal
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Salem, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 24, 2011 · Synced Oct 14, 2026, 2:20 PM EDT
Not listed Phase 2 Interventional

Effects of Vitamin D on Inflammation in Liver Disease

NCT01754961
View directory record Official record
Conditions
Hepatitis C Infection, Vitamin D Deficiency
Interventions
Vitamin D, Placebo
Drug
Lead sponsor
Veterans Medical Research Foundation
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Dec 21, 2012 · Synced Oct 14, 2026, 2:20 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Evaluation of a Transdermal Vitamin D3 Delivery System, D3forME

NCT02174718
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Transdermal D Patch, Oral vitamin D3, Placebo patch, Oral placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 85 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 2, 2018 · Synced Oct 14, 2026, 2:20 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 14, 2026, 2:20 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Interventional Testing of Gene-environment Interactions Via the Verifomics Mobile Application

NCT02758990
View directory record Official record
Conditions
Obesity, Rhinitis, Rhinitis, Allergic, Respiratory Sounds, Dyspnea, Headache, Migraine Disorders, Arthritis, Arthralgia, Anxiety, Sleep Initiation and Maintenance Disorders, Sleep Deprivation
Interventions
Vitamin A, Vitamin B6, Vitamin C, Nicotinamide, Vitamin D3, Vitamin E, Broccoli, Spinach, Caffeine, Coffee, Axon Eyewear, Chocolate
Dietary Supplement · Other · Device
Lead sponsor
Verifomics LLC
Industry
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Oct 2, 2017 · Synced Oct 14, 2026, 2:20 PM EDT
Terminated Phase 1Phase 2 Interventional Results available

Calcitriol in Combination With Ketoconazole and Therapeutic Hydrocortisone in Treating Patients With Prostate Cancer

NCT00536991
View directory record Official record
Conditions
Prostate Adenocarcinoma, Recurrent Prostate Carcinoma, Stage III Prostate Cancer, Stage IV Prostate Cancer
Interventions
Calcitriol, Ketoconazole, Laboratory Biomarker Analysis, Pharmacological Study, Therapeutic Hydrocortisone
Dietary Supplement · Drug · Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years and older · Male only
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2016
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jun 14, 2017 · Synced Oct 14, 2026, 2:20 PM 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 Oct 14, 2026, 2:20 PM EDT
Completed Phase 1 Interventional

Vitamin D Therapy in Patients With Systemic Lupus Erythematosus (SLE)

NCT00418587
View directory record Official record
Conditions
Systemic Lupus Erythematosus
Interventions
Cholecalciferol
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 85 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2014
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 18, 2018 · Synced Oct 14, 2026, 2:20 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 14, 2026, 2:20 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 14, 2026, 2:20 PM EDT
Completed Not applicable Interventional

Vitamin D Administration in the Nursing Home

NCT00204919
View directory record Official record
Conditions
Vitamin D Deficiency, Osteoporosis
Interventions
Vitamin D, placebo
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
55 Years and older
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2004
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 4, 2023 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Phase 3 Interventional

Rhinitis in the Elderly: The Role of Vitamin D

NCT02272101
View directory record Official record
Conditions
Rhinitis
Interventions
Vitamin D versus placebo
Dietary Supplement
Lead sponsor
Rohr and Columbo Asthma, Allergy and Immunology Specialists, P.C.
Other
Eligibility
65 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
2
States / cities
Bryn Mawr, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 22, 2014 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Not applicable Interventional

The Effect of Vitamin D Supplementation on Glucose Metabolism in Non-Diabetic African American Adults

NCT01141192
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
vitamin D3, cholecalciferol, Inactive comparator
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
19 Years to 60 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 10, 2010 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Not applicable Interventional Results available

Cholecalciferol Versus Doxercalciferol in the Treatment of Secondary Hyperparathyroidism in Chronic Kidney Disease

NCT00285467
View directory record Official record
Conditions
Renal Osteodystrophy
Interventions
doxercalciferol, Cholecalciferol
Drug
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 82 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated May 2, 2016 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate Oral Salmon Calcitonin in the Treatment of Osteoporosis in Postmenopausal Women Taking Calcium and Vitamin D

NCT00525798
View directory record Official record
Conditions
Osteoporosis
Interventions
SMC021 Oral calcitonin, SMC021 Placebo
Drug
Lead sponsor
Nordic Bioscience A/S
Industry
Eligibility
55 Years to 85 Years · Female only
Enrollment
4,665 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
3
States / cities
Gainesville, Georgia • Detroit, Michigan • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Oct 29, 2012 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety, Efficacy, and Feasibility of High-dose Cholecalciferol in Pediatric Patients With Cystic Fibrosis

NCT02613884
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Treatment
Drug
Lead sponsor
Johns Hopkins All Children's Hospital
Other
Eligibility
36 Months to 18 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
St. Petersburg, Florida
Source: ClinicalTrials.gov public record
Updated Feb 3, 2021 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Vitamin D Levels in the Skin of Healthy Subjects After Oral Supplementation

NCT01447355
View directory record Official record
Conditions
Healthy, no Evidence of Disease, Skin Cancer
Interventions
cholecalciferol
Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
40 Years and older
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Oct 8, 2014 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Optimizing Vitamin D Nutrition in Healthy Adults

NCT00327847
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Oral Vitamin D Supplementation
Drug
Lead sponsor
Winthrop University Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2006
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Sep 25, 2008 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

25-Hydroxyvitamin D Pharmacokinetic Study

NCT03401541
View directory record Official record
Conditions
Vitamin D Deficiency, Fat Malabsorption
Interventions
Calcifediol, Calciferol
Drug
Lead sponsor
Boston University
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 4, 2020 · Synced Oct 14, 2026, 2:20 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 14, 2026, 2:20 PM EDT
Terminated Phase 2 Interventional

Vitamin D Supplementation for Adults With Neurofibromatosis Type 1 (NF1)

NCT01968590
View directory record Official record
Conditions
Neurofibromatosis Type 1 (NF1)
Interventions
Cholecalciferol
Drug
Lead sponsor
University of Utah
Other
Eligibility
25 Years to 40 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
2
States / cities
Cincinnati, Ohio • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 25, 2022 · Synced Oct 14, 2026, 2:20 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Metformin, Vitamin D, and Depression in Polycystic Ovary Syndrome (PCOS) Trial

NCT03380091
View directory record Official record
Conditions
PCOS, Depression, Vitamin D Deficiency, Insulin Resistance
Interventions
Metformin, Vitamin D
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Feb 9, 2021 · Synced Oct 14, 2026, 2:20 PM EDT
Completed Early Phase 1 Interventional

Effect of Vitamin D After Application With Valchlor

NCT02968446
View directory record Official record
Conditions
Skin Irritation
Interventions
4 placebo, 4 Vitamin D, Valchlor
Dietary Supplement · Drug
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 23, 2021 · Synced Oct 14, 2026, 2:20 PM EDT