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ClinicalTrials.gov public records Last synced Nov 15, 2026, 7:04 AM EST

All trial information on this site comes from the official ClinicalTrials.gov public API (clinicaltrials.gov/api/v2), run by the U.S. National Library of Medicine. We only display that public information; we do not add opinions, endorsements, or any other intent. Always review the official ClinicalTrials.gov record for the latest information.

Showing 145–168 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Chronic Kidney Disease stage3, Chronic Kidney Disease stage4, Vitamin d Deficiency, Secondary Hyperparathyroidism
Interventions: CTAP101, Placebo; Drug
Lead sponsor: OPKO Health, Inc.; Industry
Eligibility: 8 Years to 17 Years
Enrollment: 2 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2023 – 2024
U.S. locations: 2
States / cities: Columbus, Ohio • Greenville, South Carolina

Conditions: Vitamin D Deficiency (10 ng/mL to 30 ng/mL)
Interventions: Vitamin D; Dietary Supplement
Lead sponsor: University of Florida; Other
Eligibility: 70 Years and older
Enrollment: 25 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2016
U.S. locations: 1
States / cities: Gainesville, Florida

Conditions: Hyperparathyroidism, Secondary, Kidney Failure, Chronic
Interventions: doxercalciferol; Drug
Lead sponsor: Duke University; Other
Eligibility: 18 Years to 80 Years
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2012
U.S. locations: 1
States / cities: Durham, North Carolina

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

Conditions: Prostate Cancer
Interventions: cholecalciferol, placebo; Drug · Other
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 19 Years to 90 Years · Male only
Enrollment: 50 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 2
States / cities: Charleston, South Carolina

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

Conditions: Vitamin D Deficiency
Interventions: cholecalciferol; Dietary Supplement
Lead sponsor: Tufts University; Other
Eligibility: 50 Years and older
Enrollment: 61 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Boston, Massachusetts

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

Conditions: Acute Myelogenous Leukemia
Interventions: Inecalcitol, Placebo Oral Tablet; Drug
Lead sponsor: Hybrigenics Corporation; Industry
Eligibility: 65 Years and older
Enrollment: 110 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2019
U.S. locations: 7
States / cities: San Diego, California • Augusta, Georgia • Las Vegas, Nevada + 4 more

Conditions: Gingivitis
Interventions: vitamin D3, Placebo; Drug · Other
Lead sponsor: Boston University; Other
Eligibility: 18 Years to 64 Years
Enrollment: 35 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2011
U.S. locations: 1
States / cities: Boston, Massachusetts

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

Conditions: Type 2 Diabetes
Interventions: Vitamin D, Placebo; Drug
Lead sponsor: University of Florida; Other
Eligibility: 30 Years to 65 Years
Enrollment: 76 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2015
U.S. locations: 1
States / cities: Gainesville, Florida

Conditions: Breast Neoplasms, Bone and Bones
Interventions: Calcitriol, Exercise, Multivitamin; Drug · Behavioral · Dietary Supplement
Lead sponsor: University of Rochester; Other
Eligibility: 18 Years and older · Female only
Enrollment: 41 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2018
U.S. locations: 1
States / cities: Rochester, New York

Conditions: Hypophosphatemia, Renal Transplant
Interventions: Cinacalcet, Placebo; Drug
Lead sponsor: Montefiore Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 40 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2015
U.S. locations: 1
States / cities: The Bronx, New York

Conditions: Glomerular Disease
Interventions: Cholecalciferol, 2000 or 4000 IUs by mouth daily for 12 weeks; Dietary Supplement
Lead sponsor: Children's Hospital of Philadelphia; Other
Eligibility: 5 Years to 30 Years
Enrollment: 32 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2017
U.S. locations: 5
States / cities: Wilmington, Delaware • Baltimore, Maryland • New Hyde Park, New York + 1 more

Conditions: Bipolar Disorder, Bipolar Depression
Interventions: Vitamin D3, Cholecalciferol, Placebo; Drug
Lead sponsor: University of Massachusetts, Worcester; Other
Eligibility: 18 Years to 75 Years
Enrollment: 33 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2015
U.S. locations: 2
States / cities: Worcester, Massachusetts

Conditions: Vitamin D Deficiency
Interventions: Not listed
Lead sponsor: Creighton University; Other
Eligibility: 18 Years to 60 Years
Enrollment: 40 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Polycystic Ovary Syndrome, Vitamin D Deficiency
Interventions: Vitamin D3; Drug
Lead sponsor: Maimonides Medical Center; Other
Eligibility: 16 Years to 48 Years · Female only
Enrollment: 79 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Brooklyn, New York

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

Conditions: Hypovitaminosis D
Interventions: Standing Phototherapy Kiosk, D3 Oral supplement; Device · Dietary Supplement
Lead sponsor: Madigan Army Medical Center; Federal
Eligibility: 18 Years to 69 Years
Enrollment: 106 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2018 – 2019
U.S. locations: 1
States / cities: Tacoma, Washington

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

Conditions: Colorectal Adenomatous Polyps
Interventions: Calcium and vitamin D3 combined, Placebo, Calcium, Vitamin D3; Dietary Supplement · Drug
Lead sponsor: Emory University; Other
Eligibility: 30 Years to 74 Years
Enrollment: 92 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2005 – 2013
U.S. locations: 1
States / cities: Atlanta, Georgia

Conditions: CKD Stage 3/4
Interventions: Vitamin D 2mg daily for 2 weeks oral paricalcitol, Placebo; Drug
Lead sponsor: University of Illinois Chicago; Other
Eligibility: 18 Years and older
Enrollment: 8 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: Advanced Hepatocellular Carcinoma, Advanced Melanoma, Locally Advanced Melanoma, Metastatic Melanoma, Stage III Hepatocellular Carcinoma AJCC v8, Stage IV Hepatocellular Carcinoma AJCC v8
Interventions: Biospecimen Collection, Cholecalciferol, Computed Tomography, Desloratadine, Immunotherapy, Infusion Procedure, Magnesium Sulfate, Magnetic Resonance Imaging, Propranolol; Procedure · Dietary Supplement · Drug + 1 more
Lead sponsor: University of Southern California; Other
Eligibility: 18 Years and older
Enrollment: 46 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2026 – 2028
U.S. locations: 1
States / cities: Los Angeles, California

Search by objective public record fields.

Phase 3 Safety and Efficacy Study of CTAP101 Extended-release Capsules in Children With Secondary Hyperparathyroidism

Vitamin D as a Supplement Against Falls in Elderly Study

How Vitamin D Analogues Affect Endothelial Cells in Patients on Dialysis

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

Vitamin D and Prostate Cancer: A Clinical Study Enrolling Subjects Undergoing Prostatectomy

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

A Pilot Study of the Effect of Dietary Fat Type and Amount on Vitamin D3 Absorption

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

Efficacy Study of Inecalcitol With Decitabine in Acute Myeloid Leukemia Patients Unfit for Standard Chemotherapy

Dose-dependent Anti-inflammatory Effects of Vitamin D in a Human Gingivitis Model

Immunotherapy After Transplantation for Skin Cancer Prevention in Organ Transplant Recipients

Effects of Treating Vitamin D Deficiency in Poorly Controlled Type 2 Diabetes

Calcitriol, Physical Activity, and Bone Health in Cancer Survivors

Using Cinacalcet to Treat the Hypophosphatemia of Early Kidney Transplant

Vitamin D Supplementation in Glomerular Disease

Vitamin D Supplementation for Bipolar Depression

Environmental & Genetic Influences on Vitamin D Status

Vitamin D Increases Serum Levels of the Soluble Receptor for Advanced Glycation End Products in Women With PCOS

Pilot Study of Vitamin K2 (MK-7) and Vitamin D3 Supplementation and the Effects on PASC Symptomatology and Inflammatory Biomarkers

Comparing a Novel Phototherapy Kiosk to Oral Vitamin D Supplementation

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

Calcium and Vitamin D vs Markers of Adenomatous Polyps

Identification of Markers for Determining the Efficacy of Vitamin D Receptor Activator Therapy in Stage 3/4 CKD Patients

Multiple Adjunct Therapies to Improve Immunotherapy Treatment in Patients With Locally Advanced or Metastatic Melanoma or Advanced Hepatocellular Cancer