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ClinicalTrials.gov public records Last synced Oct 4, 2026, 1:24 PM EDT

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Showing 25–48 of 326 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Oral vitamin D3 Clear all
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of VisionPure™ on Indices of Vision Health and Cognitive Function

NCT05533658
View directory record Official record
Conditions
Eye Health, Vision, Cognitive Function
Interventions
VisionPure Dietary Supplement, Placebo
Dietary Supplement
Lead sponsor
Applied Science & Performance Institute
Industry
Eligibility
18 Years to 40 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
3
States / cities
Lutz, Florida • Tampa, Florida
Source: ClinicalTrials.gov public record
Updated May 26, 2023 · Synced Oct 4, 2026, 1:24 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 4, 2026, 1:24 PM EDT
Terminated Phase 1Phase 2 Interventional Results available

Ph I/II of Vitamin D on Bone Mineral Density & Markers of Bone Resorption

NCT00904423
View directory record Official record
Conditions
Breast Cancer, Bone Diseases
Interventions
Vitamin D
Drug
Lead sponsor
Mark Pegram
Other
Eligibility
18 Years to 85 Years · Female only
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Feb 14, 2017 · Synced Oct 4, 2026, 1:24 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

HMB Cerebral Palsy Pilot Study

NCT05384951
View directory record Official record
Conditions
Cerebral Palsy
Interventions
HMB + Vitamin D3
Dietary Supplement
Lead sponsor
Gillette Children's Specialty Healthcare
Other
Eligibility
13 Years to 17 Years
Enrollment
7 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Saint Paul, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 22, 2024 · Synced Oct 4, 2026, 1:24 PM EDT
Terminated Phase 2 Interventional Results available

Calcitriol and Dexamethasone Before Radical Prostatectomy in Treating Patients With Localized Adenocarcinoma (Cancer) of the Prostate

NCT00084864
View directory record Official record
Conditions
Prostate Cancer
Interventions
calcitriol, dexamethasone, clinical observation
Dietary Supplement · Drug · Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years to 120 Years · Male only
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2010
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jun 12, 2017 · Synced Oct 4, 2026, 1:24 PM EDT
Completed Not applicable Interventional

Effects of Oral Cholecalciferol (Vitamin D3) on Bone Health, Neuromuscular Function, and Quality of Life in Adults With Chronic Kidney Disease

NCT00511225
View directory record Official record
Conditions
End Stage Renal Disease
Interventions
cholecalciferol, placebo
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
19 Years and older
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Jul 3, 2012 · Synced Oct 4, 2026, 1:24 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 4, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Nutrition and Body Composition in Acute Lymphoblastic Leukemia

NCT01317940
View directory record Official record
Conditions
Precursor Cell Lymphoblastic Leukemia-Lymphoma, Vitamin D Deficiency
Interventions
Vitamin D and Calcium Citrate
Dietary Supplement
Lead sponsor
Children's Hospital Los Angeles
Other
Eligibility
10 Years to 29 Years
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jul 8, 2020 · Synced Oct 4, 2026, 1:24 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Can Vitamin D Reduce the Burden of COVID-19?

NCT07128069
View directory record Official record
Conditions
COVID-19
Interventions
Vitamin D 400IU, Vitamin D 4000IU
Dietary Supplement
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
2,093 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 7, 2026 · Synced Oct 4, 2026, 1:24 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 4, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Safety and Effectiveness of Alendronate for Bone Mineral Density in HIV-infected Children and Adolescents

NCT00921557
View directory record Official record
Conditions
HIV Infection
Interventions
Alendronate, Placebo, Calcium carbonate/vitamin D
Drug · Dietary Supplement
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
11 Years to 24 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2017
U.S. locations
7
States / cities
Los Angeles, California • Miami, Florida • Tampa, Florida + 4 more
Source: ClinicalTrials.gov public record
Updated Nov 5, 2021 · Synced Oct 4, 2026, 1:24 PM EDT
Completed Phase 3 Interventional Results available

Effect of Teriparatide on Hip Fracture Healing

NCT01473589
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
122 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
24
States / cities
Phoenix, Arizona • Tucson, Arizona • La Mesa, California + 21 more
Source: ClinicalTrials.gov public record
Updated Apr 16, 2015 · Synced Oct 4, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Personalized Treatment Algorithms for Difficult-to-treat Asthma

NCT04179461
View directory record Official record
Conditions
Asthma in Children
Interventions
Cholecalciferol, antihistamine, Azithromycin, emollient cream, Fluticasone Propionate, Asthma Controller Medication
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
6 Years to 17 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 20, 2021 · Synced Oct 4, 2026, 1:24 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 4, 2026, 1:24 PM EDT
Recruiting Not applicable Interventional

Vitamin D Effects on Immune Microenvironment of Nonmelanoma Skin Cancer After Photodynamic Therapy (PDT)

NCT07241585
View directory record Official record
Conditions
Nonmelanoma Skin Cancer, Basal Cell Carcinoma, Squamous Cell Carcinoma
Interventions
Vitamin D (VitD), Placebo, Photodynamic therapy (PDT), Mohs surgery or electrodessication & curettage (ED&C) (standard of care)
Dietary Supplement · Other · Procedure
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 18, 2026 · Synced Oct 4, 2026, 1:24 PM EDT
Completed Phase 1 Interventional

Vitamin D Regulation of Gut Specific B Cells and Antibodies Targeting Gut Bacteria in Inflammatory Bowel Disease

NCT04828031
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Ulcerative Colitis, Crohn Disease
Interventions
Vitamin D
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Sep 21, 2023 · Synced Oct 4, 2026, 1:24 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Sulfates in Breastmilk

NCT06203041
View directory record Official record
Conditions
Vitamin D Deficiency, Breast Milk Collection
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
1 Month to 60 Years
Enrollment
101 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Oct 4, 2026, 1:24 PM EDT
Terminated Phase 2 Interventional

Statin Monotherapy for Treatment of Endocrine Metabolic Disease Risk

NCT03113994
View directory record Official record
Conditions
Spinal Cord Injuries, Osteoporosis, Metabolic Syndrome
Interventions
Rosuvastatin Calcium, Placebo Oral Tablet, Coenzyme Q10, Calcium Carbonate, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Dr. B. Catharine. Craven
Other
Eligibility
18 Years to 60 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Apr 13, 2026 · Synced Oct 4, 2026, 1:24 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Bioequivalence Study on Vitamin D in Healthy Adults

NCT03552653
View directory record Official record
Conditions
Measure Absorption of Vitamin D in Blood
Interventions
Vitafusion Extra Strength Vitamin D
Dietary Supplement
Lead sponsor
Church & Dwight Company, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Princeton, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 12, 2018 · Synced Oct 4, 2026, 1:24 PM EDT
Terminated Phase 2 Interventional Results available

Oral Calcitriol With Ketoconazole in CRPC

NCT03261336
View directory record Official record
Conditions
Castration-resistant Prostate Cancer
Interventions
Calcitriol, Ketoconazole, Hydrocortisone
Drug
Lead sponsor
Donald Trump, MD
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Fairfax, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 8, 2021 · Synced Oct 4, 2026, 1:24 PM EDT
Recruiting Early Phase 1 Interventional

VitD3 Supplementation in Patients With Multiple Myeloma

NCT05846880
View directory record Official record
Conditions
Multiple Myeloma
Interventions
Lenalidomide, Maintenance Vitamin D, No maintenance Vitamin D
Drug
Lead sponsor
Amany Keruakous, MD, MS.
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 8, 2025 · Synced Oct 4, 2026, 1:24 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 4, 2026, 1:24 PM EDT
Completed Not applicable Interventional

Vitamin D Effect on Calcium Absorption on Persons on Hemodialysis

NCT01325610
View directory record Official record
Conditions
Chronic Kidney Disease, End Stage Renal Disease, Vitamin D Deficiency
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
19 Years and older
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Apr 4, 2012 · Synced Oct 4, 2026, 1:24 PM EDT
Completed Phase 3 Interventional

Risedronate in Preventing Bone Loss in Premenopausal Women Receiving Chemotherapy for Primary Breast Cancer

NCT00054418
View directory record Official record
Conditions
Breast Cancer, Osteoporosis
Interventions
calcium carbonate, vitamin D, risedronate sodium, placebo
Dietary Supplement · Drug · Other
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
18 Years and older · Female only
Enrollment
216 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
198
States / cities
Mobile, Alabama • Scottsdale, Arizona • Aurora, Colorado + 124 more
Source: ClinicalTrials.gov public record
Updated Jul 13, 2016 · Synced Oct 4, 2026, 1:24 PM EDT