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ClinicalTrials.gov public records Last synced Oct 10, 2026, 4:04 AM EDT

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Showing 49–72 of 959 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D3 (cholecalciferol) Clear all
Recruiting Early Phase 1 Interventional

Immunological Effects of Vitamin D Replacement Among Black/African American Prostate Cancer Patients

NCT05045066
View directory record Official record
Conditions
Localized Prostate Carcinoma, Stage IV Prostate Cancer AJCC v8, Locally Recurrent Prostate Carcinoma, Metastatic Prostate Carcinoma
Interventions
Cholecalciferol, Quality-of-Life Assessment, Biospecimen Collection
Dietary Supplement · Other · Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older · Male only
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2029
U.S. locations
2
States / cities
Scottsdale, Arizona • Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 8, 2026 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Calcium Supplementation for a Healthy Weight (CaSHeW)

NCT01363115
View directory record Official record
Conditions
Obesity, Overweight
Interventions
Orange Juice fortified with Calcium and Vitamin D, Orange juice without Ca or VitD, Nutritional Counseling
Dietary Supplement · Behavioral
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
130 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 1, 2011 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Comparative Effectiveness of Vitamin D and Repletion Strategies

NCT01524874
View directory record Official record
Conditions
Hypovitaminosis D, Insulin Resistance, Diabetes
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Bastyr University
Other
Eligibility
18 Years to 65 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
2
States / cities
Kailua-Kona, Hawaii • Kenmore, Washington
Source: ClinicalTrials.gov public record
Updated Feb 2, 2012 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Phase 3 Interventional Results available

Effectiveness of Paricalcitol in Reducing Parathyroid Hormone (PTH) Levels in X-linked Hypophosphatemic Rickets

NCT00417612
View directory record Official record
Conditions
Hypophosphatemia, Familial, Hyperparathyroidism
Interventions
Paricalcitol, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
9 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 17, 2020 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Not applicable Interventional Results available

Vitamin D and Omega-3 Trial to Prevent and Treat Diabetic Kidney Disease

NCT01684722
View directory record Official record
Conditions
Diabetes
Interventions
Vitamin D, Omega-3 fatty acids (fish oil), Vitamin D placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
University of Washington
Other
Eligibility
50 Years and older
Enrollment
1,312 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 21, 2022 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Phase 1 Interventional

Ergocalciferol Therapy in Calcidiol Deficient, Hemodialysis Patients on Therapeutic Doses of Paricalcitol

NCT02011828
View directory record Official record
Conditions
Inflammation, Insulin Resistance
Interventions
Ergocalciferol, Placebo
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
58 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Aug 11, 2016 · Synced Oct 10, 2026, 4:04 AM EDT
Terminated Phase 4 Interventional

Evaluate the Survival Benefits of Zemplar Versus Calcijex in Subjects w/ Stage V Chronic Kidney Disease on Hemodialysis

NCT00062699
View directory record Official record
Conditions
End-Stage Kidney Disease
Interventions
Zemplar (paricalcitol injection), Calcijex
Drug
Lead sponsor
Abbott
Industry
Eligibility
20 Years and older
Enrollment
2,200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2003
U.S. locations
60
States / cities
Tuscaloosa, Alabama • Inglewood, California • Los Angeles, California + 40 more
Source: ClinicalTrials.gov public record
Updated Aug 2, 2006 · Synced Oct 10, 2026, 4:04 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 Oct 10, 2026, 4:04 AM EDT
Recruiting Phase 3 Interventional

Vitamin D for Prostate Endocrine Therapy

NCT05838716
View directory record Official record
Conditions
Stage I Prostate Cancer AJCC v8, Stage II Prostate Cancer AJCC v8, Stage III Prostate Cancer AJCC v8, Stage IVA Prostate Cancer AJCC v8
Interventions
Biospecimen Collection, D Vitamin, Dual X-ray Absorptiometry, Placebo Administration, Quality-of-Life Assessment, Questionnaire Administration
Procedure · Dietary Supplement · Drug + 1 more
Lead sponsor
University of Rochester
Other
Eligibility
50 Years and older · Male only
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
51
States / cities
Newark, Delaware • Danville, Illinois • Decatur, Illinois + 39 more
Source: ClinicalTrials.gov public record
Updated Jan 15, 2026 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Not applicable Interventional Results available

The Effect of Hypovitaminosis D and Vitamin D Supplementation on Fracture Nonunion Rates

NCT01691833
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 14, 2022 · Synced Oct 10, 2026, 4:04 AM EDT
Terminated Phase 3 Interventional Results available

Efficacy and Safety of Cinacalcet in Pediatric Patients With Secondary Hyperparathyroidism (SHPT) and Chronic Kidney Disease (CKD) on Dialysis

NCT02138838
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism
Interventions
Cinacalcet HCl, Standard of Care
Drug · Dietary Supplement
Lead sponsor
Amgen
Industry
Eligibility
6 Years to 17 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
26
States / cities
Los Angeles, California • Wilmington, Delaware • Atlanta, Georgia + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 29, 2020 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of VisionPure™ on Indices of Vision Health and Cognitive Function

NCT05533658
View directory record Official record
Conditions
Eye Health, Vision, Cognitive Function
Interventions
VisionPure Dietary Supplement, Placebo
Dietary Supplement
Lead sponsor
Applied Science & Performance Institute
Industry
Eligibility
18 Years to 40 Years
Enrollment
15 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 May 26, 2023 · Synced Oct 10, 2026, 4:04 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers

Improving Functionality in Older People

NCT03611049
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
High dose Vitamin D3, Low dose Vitamin D3
Dietary Supplement
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
65 Years to 89 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Jul 23, 2019 · Synced Oct 10, 2026, 4:04 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Vitamin D Receptor Polymorphisms and Non-Melanoma Skin Cancer Risk

NCT03040492
View directory record Official record
Conditions
Skin Cancer, Non-Melanoma
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
50 Years and older
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 8, 2025 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Optimizing Vitamin D Status During Initial Military Training

NCT01617109
View directory record Official record
Conditions
Bone Health, Nutrition Status
Interventions
Ca/Vit D, Placebo
Dietary Supplement · Other
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years to 42 Years
Enrollment
342 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2018
U.S. locations
2
States / cities
Fort Sill, Oklahoma • San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Oct 11, 2018 · Synced Oct 10, 2026, 4:04 AM EDT
Completed No phase listed Observational Results available

Effects of Gastric Bypass Surgery and Calcium Metabolism and the Skeleton

NCT01330914
View directory record Official record
Conditions
Obesity, Morbid, Gastric Bypass
Interventions
Not listed
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
25 Years to 70 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Mar 15, 2019 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Supplementation and Effects on Mood in Emergency Medicine Residents

NCT03739671
View directory record Official record
Conditions
Seasonal Mood Disorder
Interventions
Vitamin D, No Vitamin D
Dietary Supplement
Lead sponsor
Corewell Health South
Other
Eligibility
18 Years and older
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Saint Joseph, Michigan
Source: ClinicalTrials.gov public record
Updated Nov 29, 2024 · Synced Oct 10, 2026, 4:04 AM EDT
Suspended Phase 2 Interventional

Vitamin D Supplementation on Reported Rates of Taxane-Induced Neuropathy

NCT05259527
View directory record Official record
Conditions
Neuropathic Pain
Interventions
Ergocalciferol Capsules, Cholecalciferol Capsules
Drug · Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated May 14, 2026 · Synced Oct 10, 2026, 4:04 AM EDT
Terminated Phase 2 Interventional

Cholecalciferol Supplementation in Strengthening Inspiratory Muscles in Cholecalciferol-Deficient Patients With Chronic Obstructive Pulmonary Disease

NCT02877641
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease, Muscle Weakness
Interventions
Cholecalciferol, Laboratory Biomarker Analysis, Multivitamin, Placebo, Questionnaire Administration
Dietary Supplement · Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
50 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Feb 15, 2017 · Synced Oct 10, 2026, 4:04 AM EDT
Terminated Phase 2 Interventional Results available

Safety, Efficacy, PK and PD of CTAP101 (Calcifediol) ER Capsules for SHPT in HD Patients VDI

NCT03602261
View directory record Official record
Conditions
Secondary Hyperparathyroidism Due to Renal Causes, Chronic Kidney Diseases, Vitamin D Deficiency, Stage 5 Chronic Kidney Disease
Interventions
Calcifediol Oral Capsule, Placebo oral capsule
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
18
States / cities
Peoria, Arizona • Phoenix, Arizona • Cypress, California + 13 more
Source: ClinicalTrials.gov public record
Updated Apr 3, 2026 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Phase 2 Interventional

Herbal Therapy for Treatment of Recurrent Prostate Cancer

NCT00669656
View directory record Official record
Conditions
Prostate Cancer
Interventions
Prostate Health Cocktail
Drug
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older · Male only
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2014
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 20, 2017 · Synced Oct 10, 2026, 4:04 AM EDT
Recruiting Early Phase 1 Interventional

VitD3 Supplementation in Patients With Multiple Myeloma

NCT05846880
View directory record Official record
Conditions
Multiple Myeloma
Interventions
Lenalidomide, Maintenance Vitamin D, No maintenance Vitamin D
Drug
Lead sponsor
Amany Keruakous, MD, MS.
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 8, 2025 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Phase 1 Interventional

Vitamin D Testing and Treatment for COVID 19

NCT04407286
View directory record Official record
Conditions
Covid 19, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Arizona State University
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Dec 30, 2021 · Synced Oct 10, 2026, 4:04 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate a Postbiotic in Supporting Weight Loss and Metabolic Health

NCT06911073
View directory record Official record
Conditions
Obesity and Overweight
Interventions
Postbiotic, Placebo
Dietary Supplement
Lead sponsor
ResBiotic Nutrition, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 14, 2026 · Synced Oct 10, 2026, 4:04 AM EDT