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ClinicalTrials.gov public records Last synced Oct 15, 2026, 7:52 AM EDT

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Showing 433–456 of 553 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D3, Cholecalciferol Clear all
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Effect of Oral Vitamin D Versus Narrow-Band UV-B Exposure on the Lipid Profile

NCT01688102
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Oral Vitamin D3, Ultraviolet Light
Dietary Supplement · Radiation
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years to 70 Years
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 6, 2017 · Synced Oct 15, 2026, 7:52 AM EDT
Not listed Phase 2 Interventional Accepts healthy volunteers

Cyclic Versus Daily Teriparatide on Bone Mass

NCT00668941
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Alendronate, Calcium, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
Helen Hayes Hospital
Other
Eligibility
45 Years to 85 Years · Female only
Enrollment
140 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2017
U.S. locations
1
States / cities
West Haverstraw, New York
Source: ClinicalTrials.gov public record
Updated Aug 10, 2017 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate the Effect of Vitamin D on PFS in Indolent Non-Hodgkin's Lymphoma

NCT03078855
View directory record Official record
Conditions
Follicular Lymphoma, Small Lymphocytic Lymphoma, Marginal Zone Lymphoma, Mucosal-Associated Lymphoid Tissue Lymphoma
Interventions
Vitamin D, Rituximab, Placebo
Dietary Supplement · Biological · Other
Lead sponsor
Jonathan Friedberg
Other
Eligibility
18 Years and older
Enrollment
211 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
7
States / cities
Miami, Florida • Atlanta, Georgia • Iowa City, Iowa + 4 more
Source: ClinicalTrials.gov public record
Updated Sep 4, 2024 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Evaluation of Vitamin D Requirements During Pregnancy

NCT00292591
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol (vitamin D3), cholecalciferol
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
16 Years to 45 Years · Female only
Enrollment
501 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2010
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Sep 19, 2016 · Synced Oct 15, 2026, 7:52 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Bioavailability of Vitamin D(25(OH)D) and Omega-3 Fatty Acid (DHA) Enhanced Chicken

NCT05248737
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
DHA/EPA fortified chicken plus Placebo, non-25(OH)D fortified chicken/eggs plus vitamin D3 supplement, non-DHA bio-enhanced chicken plus supplement DHA Omega-3, 25(OH)D bioenhanced chicken and eggs plus placebo, Dietary Supplement: DHA/EPA fortified eggs plus Placebo, non-DHA bio-enhanced eggs plus supplement DHA Omega-3, non-25(OH)D fortified chicken/eggs plus placebo
Dietary Supplement · Other
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 35 Years
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Apr 1, 2026 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Nutraceutical Effects on Long-Term Memory

NCT01963767
View directory record Official record
Conditions
Aging
Interventions
NT-020, Placebo
Drug · Dietary Supplement
Lead sponsor
University of South Florida
Other
Eligibility
65 Years to 85 Years
Enrollment
139 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Jul 4, 2014 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Not applicable Interventional

Randomized Study of Alendronate in Adult Patients With Cystic Fibrosis Related Osteoporosis

NCT00004489
View directory record Official record
Conditions
Osteoporosis, Cystic Fibrosis
Interventions
alendronate sodium, calcium carbonate, cholecalciferol
Drug
Lead sponsor
University of North Carolina
Other
Eligibility
18 Years to 45 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2002
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 25, 2015 · Synced Oct 15, 2026, 7:52 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

VITamin D and OmegA-3 TriaL: Effects on Mammographic Density and Breast Tissue

NCT02239874
View directory record Official record
Conditions
Benign Breast Disease
Interventions
Vitamin D and fish oil placebo, Fish oil and vitamin D placebo, Vitamin D placebo and fish oil placebo, Vitamin D and fish oil
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
55 Years to 67 Years · Female only
Enrollment
3,894 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 7, 2022 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Phase 2 Interventional Results available

High Dose Vitamin D for Sickle Cell Disease

NCT01331148
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Vitamin D, Placebo
Drug · Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
7 Years to 21 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 9, 2022 · Synced Oct 15, 2026, 7:52 AM 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 15, 2026, 7:52 AM EDT
Completed Not applicable Interventional Results available

Optimizing Vitamin D in the Elderly

NCT01554241
View directory record Official record
Conditions
Deficiency of Vitamin D3
Interventions
D3 2000 IU/day, D3 4000 IU/day, D3 50,000 IU weekly, vitamin D3 800 IU/day
Dietary Supplement
Lead sponsor
University of California, San Francisco
Other
Eligibility
65 Years and older
Enrollment
86 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Feb 18, 2015 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Preventing Health Disparities During Pregnancy Through Vitamin D Supplementation

NCT01932788
View directory record Official record
Conditions
Vitamin D3 Deficiency
Interventions
Vitamin D3 4000 IU in gummy form, Placebo gummy vitamin
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
342 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Nov 21, 2018 · Synced Oct 15, 2026, 7:52 AM EDT
Terminated Phase 3 Interventional Results available

Zolendronate for the Prevention of Bone Loss in Men w/ Prostate CA on Long-Term Androgen Deprivation

NCT00058188
View directory record Official record
Conditions
Osteoporosis, Prostate Cancer
Interventions
cholecalciferol, calcium gluconate, zoledronic acid
Dietary Supplement · Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older · Male only
Enrollment
53 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
3
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 8, 2020 · Synced Oct 15, 2026, 7:52 AM 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, 7:52 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Trial Of Paricalcitol and Cholecalciferol(Vitamin D3) in the Treatment Of Secondary Hyperparathyroidism in Patients After ROUX-EN-Y Gastric Bypass Surgery

NCT01138475
View directory record Official record
Conditions
Gastric Bypass, Parathyroid Hormone
Interventions
Paricalcitol, Cholecalciferol, Placebo
Drug
Lead sponsor
Kerstyn C. Zalesin, M.D.
Other
Eligibility
18 Years to 100 Years
Enrollment
49 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Royal Oak, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 22, 2017 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

DAYLIGHT: Vitamin D Therapy in Individuals at High Risk of Hypertension

NCT01240512
View directory record Official record
Conditions
Hypertension, Vitamin D Deficiency, Pre-Hypertension
Interventions
Cholecalciferol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 50 Years
Enrollment
534 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
3
States / cities
Hartford, Connecticut • Boston, Massachusetts • Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 9, 2017 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Not applicable Interventional Results available

Vitamin D and Type 2 Diabetes Study

NCT01942694
View directory record Official record
Conditions
Prediabetes, Type 2 Diabetes
Interventions
Vitamin D (Cholecalciferol), Placebo
Dietary Supplement · Other
Lead sponsor
Tufts Medical Center
Other
Eligibility
30 Years and older
Enrollment
2,423 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
25
States / cities
Phoenix, Arizona • Los Angeles, California • Palo Alto, California + 20 more
Source: ClinicalTrials.gov public record
Updated Aug 16, 2022 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Role of Vitamin D in Menopause: Relationship to Menopausal Symptoms in Body Composition

NCT01141972
View directory record Official record
Conditions
Hot Flushes, Menopause, Premature, Obesity, Vitamin D Deficiency
Interventions
Vitamin D, Placebo
Dietary Supplement · Other
Lead sponsor
Kaiser Permanente
Other
Eligibility
40 Years to 60 Years · Female only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated May 30, 2013 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating Vitamin D Content in Mushrooms

NCT01815437
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Mushroom Vitamin D2, Cholecalciferol, Vitamin D2 - Ergocalciferol, Mushroom Extract
Dietary Supplement
Lead sponsor
Boston University
Other
Eligibility
18 Years to 64 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 27, 2017 · Synced Oct 15, 2026, 7:52 AM EDT
Recruiting Early Phase 1 Interventional

Vitamin D in Patients With Stage I-III Colon Cancer or Resectable Colon Cancer Liver Metastases

NCT02172651
View directory record Official record
Conditions
Stage, Colon Cancer, Stage I-III Colon Cancer, Stage IV Colon Cancer With Resectable Liver Metastases
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Oct 15, 2026, 7:52 AM 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 15, 2026, 7:52 AM EDT
Completed Early Phase 1 Interventional

Effects of Vitamin D3 Versus 25OHD3 on Mineral Metabolism and Immune Function

NCT02091219
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D, 25(OH)D3
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 28, 2021 · Synced Oct 15, 2026, 7:52 AM EDT
Completed Not applicable Interventional Results available

Vitamin D in Minorities With Prediabetes

NCT00876928
View directory record Official record
Conditions
Pre-diabetes
Interventions
vitamin D, placebo
Drug
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
18 Years to 90 Years
Enrollment
117 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 14, 2013 · Synced Oct 15, 2026, 7:52 AM EDT
Terminated Phase 1 Interventional

Calcitriol, Cisplatin, and Gemcitabine Hydrochloride in Treating Patients With Advanced Solid Tumors That Cannot Be Removed by Surgery

NCT01093092
View directory record Official record
Conditions
Adult Solid Neoplasm
Interventions
Calcitriol, Cisplatin, Gemcitabine Hydrochloride, Pharmacological Study
Dietary Supplement · Drug · Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
2
States / cities
Buffalo, New York • Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 12, 2016 · Synced Oct 15, 2026, 7:52 AM EDT