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ClinicalTrials.gov public records Last synced Sep 30, 2026, 11:12 AM EDT

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Showing 1–24 of 958 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: cholecalciferol (Vitamin D3) Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating Mental Health Improvements After Using Home Phototherapy Device With UVB LEDs

NCT05235334
View directory record Official record
Conditions
Usability, Quality of Life
Interventions
MySOLIUS
Device
Lead sponsor
BeneSol, Inc. dba SOLIUS
Industry
Eligibility
18 Years and older
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Irvine, California
Source: ClinicalTrials.gov public record
Updated Apr 25, 2023 · Synced Sep 30, 2026, 11:12 AM 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 Sep 30, 2026, 11:12 AM EDT
Active, not recruiting Phase 2 Interventional Results available

Vitamin D and Physical Activity on Bone Health

NCT01419730
View directory record Official record
Conditions
Bone Metabolism Biomarkers, Bone Mineral Density, Physical Fitness
Interventions
Vitamin D3, Physical Activity
Drug · Behavioral
Lead sponsor
University of Rochester
Other
Eligibility
18 Years to 99 Years · Female only
Enrollment
191 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2026
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Aug 5, 2026 · Synced Sep 30, 2026, 11:12 AM EDT
Terminated Not applicable Interventional Results available

Vitamin D Supplementation Requirement in Obese Subjects

NCT00996866
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D3, placebo
Drug
Lead sponsor
Winthrop University Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Jul 3, 2023 · Synced Sep 30, 2026, 11:12 AM 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 Sep 30, 2026, 11:12 AM EDT
Completed Early Phase 1 Interventional

A Pilot Study to Examine the Effects of Vitamin D Supplementation on Mitochondrial Bioenergetics in Older Adults

NCT02445066
View directory record Official record
Conditions
Low 25-hydroxyvitamin D Concentrations
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
65 Years to 89 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 15, 2018 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Phase I/II Study of High-Dose Calcitriol Plus Temodar for Patients With Metastatic Melanoma

NCT00301067
View directory record Official record
Conditions
Metastatic Melanoma
Interventions
Calcitriol, Temozolomide
Dietary Supplement · Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 4, 2019 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Study to Observe the Capability to Absorb Calcium as an Measure of Adequate Levels of Vitamin D

NCT01119378
View directory record Official record
Conditions
Postmenopausal, Vitamin D Deficiency
Interventions
Dual isotope technique
Other
Lead sponsor
Winthrop University Hospital
Other
Eligibility
50 Years to 70 Years · Female only
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Dec 31, 2014 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Not applicable Interventional Results available

Cholecalciferol in Newly Diagnosed Non-Hodgkin Lymphoma or Chronic Lymphocytic Leukemia With Vitamin D Deficiency

NCT02553447
View directory record Official record
Conditions
Chronic Lymphocytic Leukemia, Non-Hodgkin Lymphoma, Untreated Chronic Lymphocytic Leukemia, Vitamin D Deficiency
Interventions
Cholecalciferol, Laboratory Biomarker Analysis
Dietary Supplement · Other
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
197 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2025
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Apr 21, 2026 · Synced Sep 30, 2026, 11:12 AM EDT
Terminated Phase 2 Interventional Results available

High-Dose Cholecalciferol in Treating Patients Receiving Combination Chemotherapy and Bevacizumab as First-Line Therapy For Metastatic Colorectal Cancer

NCT01198548
View directory record Official record
Conditions
Stage IV Colon Cancer, Stage IV Rectal Cancer
Interventions
leucovorin calcium, bevacizumab, cholecalciferol, fluorouracil, oxaliplatin, pharmacological study
Drug · Biological · Dietary Supplement + 1 more
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years to 79 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jul 21, 2014 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Vitamin D Deficiency and Vitamin D Supplementation on Glucose Metabolism

NCT00749918
View directory record Official record
Conditions
Prediabetes, Vitamin D Deficiency
Interventions
Cholecalciferol (vitamin D3)
Dietary Supplement
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 65 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 20, 2008 · Synced Sep 30, 2026, 11:12 AM EDT
Completed No phase listed Observational Results available

Assess Vitamin D Levels in Those With & Without Thyroid Cancer

NCT00719615
View directory record Official record
Conditions
Thyroid Cancer
Interventions
Not listed
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
111 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 16, 2023 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Effects of Vitamin D Supplementation on Strength, Bone Density, and Injury Risk in Collegiate Athletes

NCT03151174
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D 10000 UNT, Vitamin D 5000 UNT
Drug
Lead sponsor
Virginia Polytechnic Institute and State University
Other
Eligibility
18 Years to 30 Years
Enrollment
68 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Blacksburg, Virginia
Source: ClinicalTrials.gov public record
Updated Oct 15, 2024 · Synced Sep 30, 2026, 11:12 AM 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 Sep 30, 2026, 11:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D and Sexual Health

NCT01450462
View directory record Official record
Conditions
Bacterial Vaginosis
Interventions
Vitamin D3 (cholecalciferol), Placebo
Dietary Supplement
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 4, 2013 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Phase 2 Interventional

Phase II Randomized Study of the Effects of Growth Hormone on Children and Adolescents on Maintenance Dialysis

NCT00004340
View directory record Official record
Conditions
Renal Osteodystrophy, End Stage Renal Disease
Interventions
calcitriol, growth hormone
Drug
Lead sponsor
National Center for Research Resources (NCRR)
NIH
Eligibility
1 Year to 18 Years
Enrollment
109 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 1995
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 24, 2005 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Phase 1 Interventional

Calcitriol, Ketoconazole, and Dexamethasone in Treating Patients With Metastatic or Unresectable Solid Tumors

NCT00238225
View directory record Official record
Conditions
Unspecified Adult Solid Tumor, Protocol Specific
Interventions
calcitriol, dexamethasone, ketoconazole
Dietary Supplement · Drug
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2004
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jan 31, 2013 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Gene Expression, Metabolomic, Microbiome, and Calcium Metabolism in Response to Varied Vitamin D Dosages

NCT02856776
View directory record Official record
Conditions
Vitamin D Insufficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Boston University
Other
Eligibility
18 Years to 50 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 18, 2019 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Bone Health in Pregnancy

NCT01145573
View directory record Official record
Conditions
Pregnancy
Interventions
Calcium or Placebo
Dietary Supplement
Lead sponsor
UCSF Benioff Children's Hospital Oakland
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
65 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Sep 14, 2020 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Personalized Vitamin D Supplementation in European and African Americans

NCT02362269
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
Female only
Enrollment
169 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
2
States / cities
Madison, Wisconsin • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 1, 2020 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Not applicable Interventional

A Study of High-Dose Vit D Versus Standard of Care Vit D Supplementation

NCT05016310
View directory record Official record
Conditions
Breast, Breast Cancer, Osteoporosis
Interventions
High Dose Vitamin D, Standard of Care Vitamin D
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 23, 2025 · Synced Sep 30, 2026, 11:12 AM EDT
Withdrawn Phase 2Phase 3 Interventional

The Effect of Vitamin D on Urinary Calcium Excretion in Kidney Stone Formers With High Urinary Calcium

NCT00948740
View directory record Official record
Conditions
Vitamin D Deficiency, Nephrolithiasis
Interventions
vitamin D (ergocalciferol)
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 9, 2017 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Pilot Study: The Effect of Ergocalciferol on Plasma Mucin-1 Levels

NCT03747523
View directory record Official record
Conditions
Ergocalciferol
Interventions
Ergocalciferol
Drug
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 65 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 29, 2020 · Synced Sep 30, 2026, 11:12 AM EDT
Completed Phase 2 Interventional Results available

Exemestane and Celecoxib in Postmenopausal Women at High Risk for Breast Cancer

NCT00073073
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Exemestane, Calcium carbonate, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Georgetown University
Other
Eligibility
Female only
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2011
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated May 17, 2016 · Synced Sep 30, 2026, 11:12 AM EDT