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ClinicalTrials.gov public records Last synced Oct 15, 2026, 1:37 PM EDT

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Showing 577–600 of 960 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D (cholecalciferol) Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Chronic Study on Body Composition, Training, Performance, and Recovery

NCT04230824
View directory record Official record
Conditions
Damage Muscle, Body Weight Changes, Performance Enhancing Product Use
Interventions
Pre-workout plus and Protein recovery plus, Placebo, 6-week resistance training program
Dietary Supplement · Other
Lead sponsor
Pharmanex
Industry
Eligibility
25 Years to 50 Years
Enrollment
69 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 13, 2022 · Synced Oct 15, 2026, 1:37 PM EDT
Terminated Not applicable Interventional

Vitamin D and T-Regulatory Cells in Coronary Artery Disease

NCT01183962
View directory record Official record
Conditions
Coronary Artery Disease, Cardiovascular Disease
Interventions
Vitamin D, No medication
Dietary Supplement · Other
Lead sponsor
Creighton University
Other
Eligibility
30 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2010
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Aug 4, 2011 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Vitamin D and Osteoporosis Prevention in Elderly African American Women

NCT01153568
View directory record Official record
Conditions
Determine Effect of Vitamin D on Bone Health in Elderly African American Women
Interventions
Vitamin D 3, placebo
Dietary Supplement · Other
Lead sponsor
Winthrop University Hospital
Other
Eligibility
60 Years and older · Female only
Enrollment
260 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2016
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Oct 3, 2018 · Synced Oct 15, 2026, 1:37 PM EDT
Terminated Phase 3 Interventional

The ENERGY 3 Study: Evaluation of Efficacy and Safety of INZ-701 in Children With ENPP1 Deficiency

NCT06046820
View directory record Official record
Conditions
Ectonucleotide Pyrophosphatase/Phosphodiesterase1 Deficiency, Autosomal Recessive Hypophosphatemic Rickets, Generalized Arterial Calcification of Infancy
Interventions
INZ-701, Control Arm (Conventional Therapy)
Drug
Lead sponsor
Inozyme Pharma
Industry
Eligibility
1 Year to 12 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
3
States / cities
Chicago, Illinois • Philadelphia, Pennsylvania • Fort Worth, Texas
Source: ClinicalTrials.gov public record
Updated Oct 1, 2026 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Magnesium Treatment on Vitamin D Metabolism in Participants Completed Personalized Prevention of Colorectal Cancer Trial

NCT03265483
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Magnesium glycinate, Placebo
Dietary Supplement
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
40 Years to 85 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 23, 2024 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Study of Vitamin D and Uric Acid Lowering on Kidney and Blood Vessel Function

NCT01320722
View directory record Official record
Conditions
Renal Function, Endothelial Function, Blood Pressure, Overweight, Obesity
Interventions
Vitamin D ergocalciferol, Probenecid, Allopurinol, Placebo
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 75 Years
Enrollment
242 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 29, 2017 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of Vitamin D Supplementation and Immune Function

NCT01399151
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D - Treatment 1, Vitamin D - Treatment 2, Vitamin D - Treatment 3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 49 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 22, 2014 · Synced Oct 15, 2026, 1:37 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 15, 2026, 1:37 PM EDT
Completed Not applicable Interventional

Acute Effect of Systemic Stress on Measured Blood Concentrations of 25 (OH) Vitamin D

NCT02460211
View directory record Official record
Conditions
Cardiovascular Disease, Vitamin D Deficiency
Interventions
Vitamin D3, Placebo
Dietary Supplement
Lead sponsor
Intermountain Health Care, Inc.
Other
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2020
U.S. locations
1
States / cities
Murray, Utah
Source: ClinicalTrials.gov public record
Updated Apr 5, 2021 · Synced Oct 15, 2026, 1:37 PM EDT
Active, not recruiting Phase 2 Interventional

High-dose Vitamin D Supplements in Older Adults

NCT03613116
View directory record Official record
Conditions
Vitamin D Deficiency, Cognitive Decline
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
65 Years to 90 Years
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Walnut Creek, California
Source: ClinicalTrials.gov public record
Updated Apr 3, 2026 · Synced Oct 15, 2026, 1:37 PM EDT
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 15, 2026, 1:37 PM EDT
Recruiting Phase 4 Interventional

Vitamin D Homeostasis in Sarcoidosis

NCT03621553
View directory record Official record
Conditions
Sarcoidosis, Vitamin D Insufficiency
Interventions
Ergocalciferol, Placebo, Calcium Citrate with Vitamin D2
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
21 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2026
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Sep 3, 2026 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Not applicable Interventional

Photo-Protection Trial (NB-UVB vs. Placebo) in High-risk Hospitalized COVID-19 Patients

NCT04818970
View directory record Official record
Conditions
Covid19, Corona Virus Infection, Autoimmune Diseases, Coagulation Disorder, Blood
Interventions
Narrow Band ultraviolet B-Band Light, non Narrow Band ultraviolet B-Band Light
Device
Lead sponsor
Cytokind, Inc.
Industry
Eligibility
50 Years to 110 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Jun 15, 2022 · Synced Oct 15, 2026, 1:37 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 15, 2026, 1:37 PM EDT
Active, not recruiting Phase 3 Interventional Accepts healthy volunteers

VITAL Rhythm Study

NCT02178410
View directory record Official record
Conditions
Cardiovascular Disease
Interventions
Vitamin D3, Omega-3 fatty acids (fish oil), Fish oil placebo, Vitamin D3 placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
25,119 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 7, 2025 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Phase 1 Interventional

Safety and Immunologic Effect of Low Dose Versus High Dose Vitamin D3 in Multiple Sclerosis

NCT01024777
View directory record Official record
Conditions
Multiple Sclerosis, Vitamin D Deficiency
Interventions
Cholecalciferol
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 55 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 6, 2013 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Phase 1Phase 2 Interventional

Vitamin D Deficiency and Replacement on Pulmonary and Endocrine Function in SCI

NCT02099955
View directory record Official record
Conditions
Spinal Cord Injury, Vitamin D Deficiency
Interventions
Vitamin D3
Drug
Lead sponsor
James J. Peters Veterans Affairs Medical Center
Federal
Eligibility
18 Years to 75 Years
Enrollment
88 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Mar 7, 2017 · Synced Oct 15, 2026, 1:37 PM EDT
Withdrawn No phase listed Observational

Effects of Swallowed Steroids on Bone Density and Growth in Pediatric Eosinophilic Esophagitis

NCT03615950
View directory record Official record
Conditions
Eosinophilic Esophagitis
Interventions
Bone Mineral Density (DEXA) scan, Vitamin D Measurement, Height measurement, Assessment of medication compliance
Diagnostic Test · Other
Lead sponsor
Arkansas Children's Hospital Research Institute
Other
Eligibility
5 Years to 12 Years
Timeline
2018 – 2020
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Oct 2, 2025 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Phase 2 Interventional

Phase II Pre-operative Vitamin D Supplementation to Prevent Post-thyroidectomy Hypocalcemia

NCT01868750
View directory record Official record
Conditions
Thyroid Nodules, Hypocalcemia
Interventions
Calcitriol, Control Pill
Dietary Supplement
Lead sponsor
David Shonka, MD
Other
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2021
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Oct 12, 2021 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Acute Study on Muscle Soreness, Damage, and Performance

NCT04230226
View directory record Official record
Conditions
Soreness, Muscle, Performance Enhancing Product Use, Damage Muscle
Interventions
Pre-workout plus and protein recovery plus, Placebo
Dietary Supplement · Other
Lead sponsor
Pharmanex
Industry
Eligibility
25 Years to 50 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 17, 2020 · Synced Oct 15, 2026, 1:37 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 15, 2026, 1:37 PM EDT
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 15, 2026, 1:37 PM EDT
Completed Phase 2 Interventional Results available

Safety, Feasibility and Efficacy of Vitamin D Supplementation in Women With Metastatic Breast Cancer (SAFE-D)

NCT02186015
View directory record Official record
Conditions
Adult Women, Metastatic Breast Cancer, Estrogen Receptor Positive
Interventions
Cholecalciferol
Drug
Lead sponsor
Loyola University
Other
Eligibility
18 Years and older · Female only
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated May 14, 2021 · Synced Oct 15, 2026, 1:37 PM EDT
Completed Phase 2 Interventional

Cholecalciferol in Treating Patients With Myelodysplastic Syndrome

NCT00068276
View directory record Official record
Conditions
Leukemia, Myelodysplastic Syndromes, Myelodysplastic/Myeloproliferative Neoplasms
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
Up to 120 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2006
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 10, 2018 · Synced Oct 15, 2026, 1:37 PM EDT