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ClinicalTrials.gov public records Last synced Oct 9, 2026, 2:18 PM EDT

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Showing 25–48 of 959 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: vitamin D3 (cholecalciferol) Clear all
Completed Phase 1Phase 2 Interventional Results available

Pilot Study of OMEGA-3 and Vitamin D in High-Dose in Type I Diabetic Patients

NCT03406897
View directory record Official record
Conditions
Diabetes Mellitus, Type 1, Hypoglycemia, Diabetes Mellitus, Diabetes, Autoimmune
Interventions
Cholecalciferol, Omega 3 fatty acid
Drug
Lead sponsor
Rodolfo Alejandro
Other
Eligibility
6 Years to 65 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Sep 17, 2025 · Synced Oct 9, 2026, 2:18 PM EDT
Completed No phase listed Observational

Role of Fat Tissue in Vitamin D Metabolism

NCT00033826
View directory record Official record
Conditions
Vitamin D, Adipose Tissue
Interventions
Not listed
Lead sponsor
Tufts University
Other
Eligibility
18 Years to 65 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 24, 2013 · Synced Oct 9, 2026, 2:18 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 9, 2026, 2:18 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of a Multi-vitamin Supplement in Adult Females

NCT03828097
View directory record Official record
Conditions
Health, Subjective
Interventions
Experimental supplement, Placebo
Dietary Supplement
Lead sponsor
Auburn University
Other
Eligibility
21 Years to 40 Years · Female only
Enrollment
94 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Auburn, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 28, 2020 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Phase 3 Interventional Results available

Zoledronate in Preventing Osteoporosis and Bone Fractures in Patients With Locally Advanced Nonmetastatic Prostate Cancer Undergoing Radiation Therapy and Hormone Therapy

NCT00329797
View directory record Official record
Conditions
Osteoporosis, Prostate Cancer
Interventions
Calcium, Zoledronic acid, radiation therapy, LHRH, Vitamin D
Dietary Supplement · Radiation · Drug
Lead sponsor
Radiation Therapy Oncology Group
Network
Eligibility
18 Years and older · Male only
Enrollment
109 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2014
U.S. locations
80
States / cities
Chico, California • Los Angeles, California • Pomona, California + 66 more
Source: ClinicalTrials.gov public record
Updated Nov 29, 2017 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Phase 4 Interventional Results available

A Study That Will Compare the Effect of Two Drugs on Participants With Low Bone Mass and a Recent Hip Fracture

NCT00887354
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Risedronate, Placebo, Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
50 Years and older
Enrollment
224 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
6
States / cities
Fort Lauderdale, Florida • New Port Richey, Florida • Orlando, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 25, 2019 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Deficiency: Bone Loss and Vascular Dysfunction

NCT00235586
View directory record Official record
Conditions
Postmenopausal Women
Interventions
10 vit. D deficient subjects take vit. D for 3 months.
Procedure
Lead sponsor
University of Kansas
Other
Eligibility
50 Years to 90 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2007
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Sep 20, 2007 · Synced Oct 9, 2026, 2:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Vitamin D Metabolism and the Williams Syndrome

NCT00013962
View directory record Official record
Conditions
Williams Syndrome
Interventions
Vitamin D
Drug
Lead sponsor
National Center for Research Resources (NCRR)
NIH
Eligibility
18 Years to 50 Years
Healthy volunteers
Accepts healthy volunteers
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 24, 2005 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Phase 2 Interventional

Calcitriol, Mitoxantrone, and Prednisone in Treating Patients With Metastatic Prostate Cancer

NCT00182741
View directory record Official record
Conditions
Prostate Cancer
Interventions
calcitriol, mitoxantrone hydrochloride, prednisone
Dietary Supplement · Drug
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
18 Years to 100 Years · Male only
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2006
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated May 3, 2017 · Synced Oct 9, 2026, 2:18 PM EDT
Completed No phase listed Observational

Vitamin D Deficiency in Obese Adolescent Girls and Influence of Vitamin D on Insulin Secretion and Sensitivity

NCT00850694
View directory record Official record
Conditions
Vitamin D Deficiency, Obesity, Insulin Resistance
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
10 Years to 18 Years · Female only
Enrollment
114 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Apr 10, 2017 · Synced Oct 9, 2026, 2:18 PM 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 Oct 9, 2026, 2:18 PM EDT
Completed No phase listed Observational

Physiologic Regulation of FGF-23

NCT00356512
View directory record Official record
Conditions
Hypoparathyroidism
Interventions
Not listed
Lead sponsor
National Institute of Dental and Craniofacial Research (NIDCR)
NIH
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2006
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 2, 2017 · Synced Oct 9, 2026, 2:18 PM EDT
Terminated No phase listed Observational

Magnesium as a Mediator of Bone and Vitamin D Metabolism in Patients on Antiepileptic Drug Therapy

NCT03471481
View directory record Official record
Conditions
Epilepsy, Magnesium Deficiency, Vitamin D Deficiency
Interventions
No Intervention. Study is Cross Sectional in nature
Other
Lead sponsor
Drexel University
Other
Eligibility
18 Years to 70 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
2
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 1, 2021 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Study of Vitamin D for Premenopausal Women at High Risk for Breast Cancer

NCT00976339
View directory record Official record
Conditions
Breast Cancer
Interventions
Cholecalciferol
Drug
Lead sponsor
Katherine D. Crew
Other
Eligibility
21 Years and older · Female only
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2013
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 29, 2017 · Synced Oct 9, 2026, 2:18 PM EDT
Withdrawn Phase 2Phase 3 Interventional

Vitamin D + Telaprevir + Peginterferon + Ribavirin for of Hepatitis C Genotype 1

NCT01890772
View directory record Official record
Conditions
Hepatitis C
Interventions
Telaprevir, Peginterferon alfa-2a, Ribavirin, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Timothy Morgan, MD
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2013
U.S. locations
4
States / cities
Long Beach, California • Minneapolis, Minnesota • Kansas City, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated May 14, 2014 · Synced Oct 9, 2026, 2:18 PM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Using a Telemedicine Approach in a Genome-wide Association Study of Atopic Dermatitis - Searching for Novel Biomarkers in Clinically Relevant Phenotypes

NCT04965233
View directory record Official record
Conditions
Atopic Dermatitis, Eczema, DNA
Interventions
DNA reports, Information reports
Behavioral
Lead sponsor
Studies&Me
Industry
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Redwood City, California
Source: ClinicalTrials.gov public record
Updated Sep 20, 2021 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Not applicable Interventional Results available

Vitamin D in HIV-Infected Patients on HAART

NCT01250899
View directory record Official record
Conditions
Vitamin D Deficiency, HIV
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 90 Years
Enrollment
122 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 25, 2014 · Synced Oct 9, 2026, 2:18 PM EDT
Recruiting No phase listed Observational

Vitamin D Dynamics in Women

NCT02705287
View directory record Official record
Conditions
Pregnancy
Interventions
Vitamin D dynamics-pregnant, Vitamin D dynamics-nonpregnant
Other
Lead sponsor
Cornell University
Other
Eligibility
20 Years to 39 Years · Female only
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Apr 1, 2026 · Synced Oct 9, 2026, 2:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Age Related Changes in Calciotropic Hormones and Their Impact on Male Osteoporosis

NCT00588874
View directory record Official record
Conditions
Low Bone Density
Interventions
Not listed
Lead sponsor
Yale University
Other
Eligibility
50 Years and older · Male only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2000 – 2008
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 30, 2023 · Synced Oct 9, 2026, 2:18 PM EDT
Withdrawn Not applicable Interventional

Vitamin D Treatment in Ulcerative Colitis

NCT01640496
View directory record Official record
Conditions
Ulcerative Colitis, Inflammatory Bowel Disease
Interventions
Vitamin D3, Placebo
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Evanston, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 2, 2014 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Phase 2 Interventional Results available

Vitamin D and Soy Supplements in Treating Patients With Recurrent Prostate Cancer

NCT00499408
View directory record Official record
Conditions
Prostate Cancer
Interventions
Vitamin D, soy
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 120 Years · Male only
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 21, 2018 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Clinical Study on the Bioequivalence of Vitamin D in Healthy Adults

NCT03552666
View directory record Official record
Conditions
Bioequivalence of Vitamin D in Healthy Adults
Interventions
vitamin D3
Dietary Supplement
Lead sponsor
Church & Dwight Company, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
9 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Princeton, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 12, 2018 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Interaction Between Calcium and Vitamin D Intake

NCT00762775
View directory record Official record
Conditions
Osteoporosis
Interventions
Calcium and vitamin D supplementation
Dietary Supplement
Lead sponsor
Winthrop University Hospital
Other
Eligibility
45 Years to 85 Years · Female only
Enrollment
78 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Dec 11, 2014 · Synced Oct 9, 2026, 2:18 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy of Nutritional Supplementation on Physical-activity Mediated Changes in Physical Functioning Older Adults at Risk for Mobility Disability (The VIVE2 Study)

NCT01542892
View directory record Official record
Conditions
Sarcopenia
Interventions
Exercise Intervention, Supplement Intervention
Other · Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
70 Years and older
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 18, 2014 · Synced Oct 9, 2026, 2:18 PM EDT