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ClinicalTrials.gov public records Last synced Oct 9, 2026, 3:04 PM EDT

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Showing 73–96 of 101 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Oral Vitamin D Supplementation Clear all
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety of Vitamin D Supplementation in Older Persons

NCT00681590
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol (vitamin D)
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
65 Years to 95 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jan 26, 2017 · Synced Oct 9, 2026, 3:04 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 9, 2026, 3:04 PM 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 Oct 9, 2026, 3:04 PM EDT
Completed Phase 3 Interventional Results available

Second Study of the Effect of Teriparatide on Hip Fracture Healing

NCT01473602
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
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
19
States / cities
San Diego, California • Golden, Colorado • Washington D.C., District of Columbia + 16 more
Source: ClinicalTrials.gov public record
Updated Apr 16, 2015 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Phase 2 Interventional Results available

Study of Vitamin D in Untreated Metastatic Colorectal Cancer

NCT01516216
View directory record Official record
Conditions
Metastatic Colorectal Cancer
Interventions
FOLFOX + bevacizumab, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
139 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2019
U.S. locations
18
States / cities
Boise, Idaho • Fruitland, Idaho • Meridian, Idaho + 13 more
Source: ClinicalTrials.gov public record
Updated Apr 26, 2022 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Trial to Assess Response to Oral Vitamin D3 Supplementation in Obese Individuals

NCT00960037
View directory record Official record
Conditions
Obesity
Interventions
Oral vitamin D3, Placebo equivalent
Dietary Supplement
Lead sponsor
Winthrop University Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
57 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Jun 18, 2012 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Phase 1 Interventional Results available

Vitamin D and Severe Asthma Exacerbations

NCT01921894
View directory record Official record
Conditions
Asthma
Interventions
Cholecalciferol
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
6 Years to 14 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 23, 2017 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Effects of Electrical Stimulation and Vitamin D Supplementation on Bone Health Following Spinal Cord Injury.

NCT05008484
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
NMES, Vitamin D, Passive movement
Device · Drug · Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years to 65 Years
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 23, 2026 · Synced Oct 9, 2026, 3:04 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Trifecta Research Study

NCT07717866
View directory record Official record
Conditions
PTSD - Post Traumatic Stress Disorder, Cognitive Dysfunction, Brain Injury, Depression - Major Depressive Disorder, Suicidal Ideation
Interventions
Magnetic e-Resonance Therapy (MeRT), Ibogaine Hydrochloride with Magnesium Sulfate, 5-methoxy-N,N-dimethyltryptamine, Physiological Supplementation
Device · Drug
Lead sponsor
Axial Therapeutic Research
Industry
Eligibility
18 Years and older
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Northridge, California
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Oct 9, 2026, 3:04 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 9, 2026, 3:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D3 Supplementation Pilot Study

NCT01546103
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Cholecalciferol
Dietary Supplement
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
12 Years to 17 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 23, 2013 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Collegiate Athlete Study

NCT07631312
View directory record Official record
Conditions
Iron Deficiency, Iron Deficiency Anemia (IDA), Vitamin D Deficiency, Vitamin D Insufficiency, Low Energy Availability, Bone Density
Interventions
Iron and Vitamin D Deficiencies Correction
Dietary Supplement
Lead sponsor
Morehouse School of Medicine
Other
Eligibility
18 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 8, 2026 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Vitamin D Supplementation in Breastfeeding Women

NCT01240265
View directory record Official record
Conditions
Vitamin D Deficiency, Rickets, Infant Nutrition Disorders
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
1 Month to 50 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 30, 2013 · Synced Oct 9, 2026, 3:04 PM EDT
Terminated Not applicable Interventional Results available

Vitamin D Replacement: The Effect on Statin-Related Myalgias

NCT01022398
View directory record Official record
Conditions
HMG-CoA Reductase Inhibitors-related Myalgias
Interventions
cholecalciferol/placebo
Drug
Lead sponsor
Creighton University
Other
Eligibility
19 Years to 89 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated May 20, 2013 · Synced Oct 9, 2026, 3:04 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Efficacy of Vitamin D Supplementation to Sustain Performance Outcomes

NCT07654777
View directory record Official record
Conditions
Acute Stress Reaction
Interventions
Vitamin D3 (Cholecalciferol), Oral Placebo Tablet
Dietary Supplement
Lead sponsor
Walter Reed Army Institute of Research (WRAIR)
Federal
Eligibility
18 Years to 40 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Silver Spring, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Not applicable Interventional

Vitamin D Supplementation in Older Adults With Urinary Incontinence

NCT01971801
View directory record Official record
Conditions
Urinary Incontinence, Vitamin D Deficiency
Interventions
Vitamin D3 50,000 IU, Placebo
Dietary Supplement · Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
50 Years and older · Female only
Enrollment
243 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Mar 9, 2018 · Synced Oct 9, 2026, 3:04 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Evaluating Response to Vitamin D3 and K2 Supplementation in Healthcare Personnel

NCT07199829
View directory record Official record
Conditions
Hypovitaminosis D, Hypovitaminosis
Interventions
Vitamin Arm 1, Vitamin Arm 2, Vitamin Arm 3, Placebo
Dietary Supplement · Other
Lead sponsor
Madigan Army Medical Center
Federal
Eligibility
18 Years to 69 Years
Enrollment
96 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Sep 30, 2025 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Phase 4 Interventional Results available

Evaluating Vitamin D3 Supplement on Post-Op Outcomes

NCT04177758
View directory record Official record
Conditions
Knee Osteoarthritis
Interventions
Vitamin D, Control
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
137 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 12, 2023 · Synced Oct 9, 2026, 3:04 PM EDT
Recruiting Phase 1Phase 2 Interventional

Durvalumab in Different Combinations With Pralatrexate, Romidepsin and Oral 5-Azacitidine for Lymphoma

NCT03161223
View directory record Official record
Conditions
Lymphoma, T-Cell
Interventions
Durvalumab, Pralatrexate, Romidepsin, 5-Azacitidine
Drug
Lead sponsor
University of Virginia
Other
Eligibility
18 Years and older
Enrollment
148 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 31, 2022 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Study of Vitamin D and Omega-3 Supplementation for Preventing Diabetes

NCT01633177
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Vitamin D3, Omega-3 fatty acid (fish oil), Vitamin D3 placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
22,220 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 3, 2026 · Synced Oct 9, 2026, 3:04 PM EDT
Terminated Phase 3 Interventional Results available

Effect of Vitamin D Supplement on Inflammation Markers in High-Risk Cardiovascular Patients With Chronic Kidney Disease

NCT01012414
View directory record Official record
Conditions
Coronary Artery Disease, Chronic Kidney Disease, Hypovitaminosis D, Secondary Hyperparathyroidism
Interventions
paricalcitol, placebo
Drug
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 20, 2014 · Synced Oct 9, 2026, 3:04 PM EDT
Recruiting Phase 2 Interventional

Impact of Vitamin D Supplementation on the Rate of Pathologic Complete Response in Vitamin D Deficient Patients

NCT04677816
View directory record Official record
Conditions
Triple Negative Breast Cancer, Vitamin D Deficiency, Invasive Breast Cancer
Interventions
Standard of Care Neoadjuvant Chemotherapy (NAC), Vitamin D3, Drug Diary
Drug · Dietary Supplement · Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Phase 2 Interventional

Effect of Vitamin D Supplementation on Hemoglobin A1c

NCT01354262
View directory record Official record
Conditions
Diabetes Mellitus, Vitamin D Deficiency
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Ascension Health
Industry
Eligibility
34 Years to 69 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Flint, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 23, 2015 · Synced Oct 9, 2026, 3:04 PM EDT
Completed Phase 1 Interventional Results available

Study of Niraparib, TSR-022, Bevacizumab, and Platinum-Based Doublet Chemotherapy in Combination With TSR-042

NCT03307785
View directory record Official record
Conditions
Neoplasms, Metastatic Cancer, Advanced Cancer, Solid Tumor, Non Small Cell Lung Cancer Metastatic, Non Small Cell Lung Cancer Stage IIIB, Non Small Cell Lung Cancer
Interventions
Niraparib, TSR-042, Carboplatin-Paclitaxel, Bevacizumab, TSR-022, Carboplatin-Pemetrexed, Carboplatin-Nab-Paclitaxel
Drug
Lead sponsor
Tesaro, Inc.
Industry
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
8
States / cities
Scottsdale, Arizona • Encinitas, California • San Marcos, California + 5 more
Source: ClinicalTrials.gov public record
Updated Nov 25, 2025 · Synced Oct 9, 2026, 3:04 PM EDT