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ClinicalTrials.gov public records Last synced Oct 14, 2026, 9:42 PM EDT

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Showing 265–288 of 407 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D3 (cholecalciferol) placebo Clear all
Completed Phase 2 Interventional Accepts healthy volunteers

Efficacy of Vitamin D in Colorectal Cancer Chemoprevention

NCT01574027
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Vitamin D3 (cholecalciferol), Placebo
Drug
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
50 Years and older
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 10, 2012 · Synced Oct 14, 2026, 9:42 PM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Averting Complications of Proton Pump Inhibitor Therapy by Effervescent Calcium Magnesium Citrate

NCT03812380
View directory record Official record
Conditions
Osteoporosis, Hypomagnesemia
Interventions
EffCaMgCit, Placebo
Drug · Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
21 Years to 99 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Aug 17, 2022 · Synced Oct 14, 2026, 9:42 PM EDT
Terminated Phase 4 Interventional

Clinical Effects of Vitamin D Repletion in Patients With Parkinson's Disease

NCT00571285
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Vitamin D3, Vitamin D3 - high dose, Placebo
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 89 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 24, 2017 · Synced Oct 14, 2026, 9:42 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D Supplements on Mental Health and Milk Composition in Mothers Living in Idaho

NCT06919718
View directory record Official record
Conditions
Maternal Stress
Interventions
Vitamin D (Cholecalciferol ), Placebo
Dietary Supplement · Other
Lead sponsor
University of Idaho
Other
Eligibility
18 Years to 64 Years · Female only
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
2
States / cities
Coeur d'Alene, Idaho • Moscow, Idaho
Source: ClinicalTrials.gov public record
Updated Sep 15, 2026 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Early Phase 1 Interventional

High Dose Vit D Musculoskeletal Symptoms & Bone Density in Anastrozole-Treated Breast Cancer With Marginal Vit D Status

NCT00263185
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Vitamin D, Calcium carbonate, Vitamin D, Placebo
Dietary Supplement · Drug · Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older · Female only
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Sep 22, 2014 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Large Randomized Trial of Vitamin D, Omega-3 Fatty Acids and Cognitive Decline

NCT01669915
View directory record Official record
Conditions
Cognitive Decline
Interventions
vitamin D3, omega-3 fatty acids (fish oil), Vitamin D3 placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
60 Years to 92 Years
Enrollment
3,424 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 21, 2023 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 2 Interventional Results available

Study of Vitamin D and Effect on Heart Disease and Insulin Resistance

NCT01093417
View directory record Official record
Conditions
Human Immunodeficiency Virus (HIV), Vitamin D Deficiency, HIV Infections
Interventions
Vitamin D, Placebo
Drug · Other
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 14, 2016 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Not applicable Interventional Results available

Effect of Vitamin D Supplementation on Inflammation and Cardiometabolic Risk Factors in Obese Adolescents

NCT01217840
View directory record Official record
Conditions
Obesity
Interventions
Drisdol (Ergocalciferol) Vitamin D2, Placebo
Drug
Lead sponsor
Stanford University
Other
Eligibility
11 Years to 17 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Nov 29, 2017 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

A Prospective Trial on the Effects of Vitamin D Supplementation in Collegiate Swimmers and Divers

NCT01488227
View directory record Official record
Conditions
Healthy
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
University of Kentucky
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Feb 25, 2013 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Blackcurrants Modify Gut Microbiota and Reduce Osteoporosis and CVD Risk

NCT04431960
View directory record Official record
Conditions
Postmenopausal Osteoporosis, Gut Microbiota, Cardiovascular Diseases
Interventions
blackcurrant (BC) extract
Drug
Lead sponsor
University of Connecticut
Other
Eligibility
45 Years to 60 Years · Female only
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 12, 2025 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 4 Interventional

Study of Safety and Efficacy of Doxercalciferol in Patients With Chronic Kidney Disease, Stage 3 or 4, and Secondary Hyperparathyroidism

NCT00123461
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Renal Failure, Chronic Renal Insufficiency
Interventions
Hectorol (doxercalciferol capsules), 0.5mcg
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
17
States / cities
Phoenix, Arizona • Alhambra, California • Riverside, California + 14 more
Source: ClinicalTrials.gov public record
Updated May 5, 2015 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Needs of Early Adolescent Children

NCT00931580
View directory record Official record
Conditions
Healthy
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
University of Georgia
Other
Eligibility
9 Years to 13 Years
Enrollment
323 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
3
States / cities
Athens, Georgia • Indianapolis, Indiana • West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Sep 25, 2015 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 3 Interventional Results available

A Severity-Adapted Clinical Trial of Diminished Bone Mineral Density in Acute Lymphoblastic Leukemia Survivors

NCT00186901
View directory record Official record
Conditions
Leukemia, Lymphoblastic, Acute, Osteoporosis
Interventions
Calcium carbonate (Tums), vitamin D, Placebo
Drug · Other
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
Not listed
Enrollment
429 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2011
U.S. locations
3
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated May 10, 2017 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Hypovitaminosis D in Neurocritical Patients

NCT02881957
View directory record Official record
Conditions
Craniocerebral Trauma, Intracranial Aneurysm, Brain Neoplasms, Spinal Cord Injuries, Seizures, Meningitis, Stroke, Intracranial Hemorrhages, Critical Illness, Vitamin d Deficiency
Interventions
Cholecalciferol, Placebo
Drug · Other
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
274 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jun 15, 2022 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Healthy Combine Study

NCT03136705
View directory record Official record
Conditions
Healthy
Interventions
Nicotinamide, Lanthanum Carbonate, Lanthanum Carbonate Placebo, Nicotinamide Placebo
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 60 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 23, 2024 · Synced Oct 14, 2026, 9:42 PM EDT
Terminated Not applicable Interventional

The Pittsburgh Vitamin D Study: Vitamin D Supplementation in Vitamin D-deficient Subjects at Risk of Lung Cancer

NCT02532062
View directory record Official record
Conditions
Deficiency of Vitamin D3, COPD
Interventions
Cholecalciferol, multivitamin, Placebo
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
50 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 26, 2018 · Synced Oct 14, 2026, 9:42 PM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Immunotherapy After Transplantation for Skin Cancer Prevention in Organ Transplant Recipients

NCT04642287
View directory record Official record
Conditions
Immunotherapy, Cutaneous Squamous Cell Carcinoma, Actinic Keratoses, Organ Transplant Recipients, Skin Cancer
Interventions
Calcipotriol Only Product in Cutaneous Dose Form, Vaseline, Topical 5FU
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
50 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2030
U.S. locations
2
States / cities
Boston, Massachusetts • St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated May 7, 2025 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 2 Interventional Results available

Males, Antioxidants, and Infertility Trial

NCT02421887
View directory record Official record
Conditions
Male Infertility
Interventions
Antioxidant Supplement, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
18 Years and older · Male only
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
10
States / cities
Los Angeles, California • San Francisco, California • Sunnyvale, California + 7 more
Source: ClinicalTrials.gov public record
Updated Sep 4, 2019 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Alendronate (Fosamax) in Children With Osteoporosis

NCT00259857
View directory record Official record
Conditions
Osteoporosis
Interventions
Alendronate
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
5 Years to 15 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2009
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jan 19, 2011 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Vitamin D for the Treatment of Women With Polycystic Ovary Syndrome (PCOS)

NCT00907153
View directory record Official record
Conditions
Polycystic Ovary Syndrome
Interventions
Vitamin D, Placebo
Dietary Supplement · Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 19, 2017 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Phase 2 Interventional Results available

Effects of Vitamin D in Parkinson's Disease (PD)

NCT01119131
View directory record Official record
Conditions
Parkinson Disease, Accidental Falls
Interventions
Vitamin D3, calcium, Placebo
Drug · Dietary Supplement · Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
50 Years to 99 Years
Enrollment
101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Mar 7, 2016 · Synced Oct 14, 2026, 9:42 PM EDT
Recruiting Not applicable Interventional

Maternal Stress on Human Milk and Infant Outcomes

NCT04821544
View directory record Official record
Conditions
Postpartum Depression, Preterm Labor
Interventions
Mindfulness-based intervention (with a focus on self-compassion; MBSC), Vitamin D
Behavioral · Dietary Supplement
Lead sponsor
University of Idaho
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Coeur d'Alene, Idaho
Source: ClinicalTrials.gov public record
Updated Sep 11, 2026 · Synced Oct 14, 2026, 9:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy and Safety Safety of Nutritears® in Adults With Dry Eye Syndrome

NCT05481450
View directory record Official record
Conditions
Dry Eye, Dry Eye Syndromes
Interventions
Blink NutriTears, Placebo
Dietary Supplement
Lead sponsor
Applied Science & Performance Institute
Industry
Eligibility
18 Years to 65 Years
Enrollment
131 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 Jun 4, 2026 · Synced Oct 14, 2026, 9:42 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 14, 2026, 9:42 PM EDT