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ClinicalTrials.gov public records Last synced Nov 15, 2026, 7:39 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 241–264 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Prostate Cancer
Interventions: calcitriol, carboplatin; Dietary Supplement · Drug
Lead sponsor: OHSU Knight Cancer Institute; Other
Eligibility: 18 Years to 120 Years · Male only
Enrollment: 19 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2000 – 2006
U.S. locations: 1
States / cities: Portland, Oregon

Conditions: Post-Menopausal Osteoporosis
Interventions: ibandronate [Bonviva/Boniva]; Drug
Lead sponsor: Hoffmann-La Roche; Industry
Eligibility: Female only
Enrollment: 781 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2004 – 2008
U.S. locations: 6
States / cities: Gainesville, Georgia • St Louis, Missouri • Omaha, Nebraska + 3 more

Conditions: Osteoarthritis, Knee
Interventions: Vitamin D (cholecalciferol), Placebo; Dietary Supplement
Lead sponsor: Tufts Medical Center; Other
Eligibility: 45 Years to 90 Years
Enrollment: 146 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2009
U.S. locations: 1
States / cities: Boston, Massachusetts

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

Conditions: PARKINSON DISEASE (Disorder)
Interventions: Prebiotic fiber bar; Drug
Lead sponsor: Stanford University; Other
Eligibility: 18 Years and older
Enrollment: 50 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2026 – 2027
U.S. locations: 1
States / cities: Stanford, California

Conditions: Ovarian Cancer, Fallopian Tube Cancer, Primary Peritoneal Cancer
Interventions: Arm A: Vitamin D3 Group, Placebo; Dietary Supplement
Lead sponsor: Northwestern University; Other
Eligibility: 18 Years and older · Female only
Enrollment: 7 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2015
U.S. locations: 2
States / cities: Chicago, Illinois • Evanston, Illinois

Conditions: Fracture, Fracture Nonunion, Fractures, Bone, Vitamin D
Interventions: Vitamin D Assessment, Fracture; Other
Lead sponsor: Methodist Health System; Other
Eligibility: 18 Years to 25 Years
Enrollment: 100 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2021
U.S. locations: 1
States / cities: Dallas, Texas

Conditions: Geographic Atrophy, Age Related Macular Degeneration, AMD, Atrophy, Geographic
Interventions: ALK-001 oral capsule, Placebo oral capsule; Drug
Lead sponsor: Alkeus Pharmaceuticals, Inc.; Industry
Eligibility: 60 Years and older
Enrollment: 200 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2024
U.S. locations: 24
States / cities: Phoenix, Arizona • Beverly Hills, California • Lakewood, Colorado + 20 more

Conditions: X-linked Adrenoleukodystrophy
Interventions: vitamin D3; Dietary Supplement
Lead sponsor: Stanford University; Other
Eligibility: 18 Months to 25 Years · Male only
Enrollment: 21 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2020
U.S. locations: 1
States / cities: Palo Alto, California

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

Conditions: Heart Failure
Interventions: Paricalcitol; Drug
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Food Allergy
Interventions: Food Supplement; Dietary Supplement
Lead sponsor: Northwestern University; Other
Eligibility: 5 Months to 11 Months
Enrollment: 705 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2017
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions: Cinacalcet, active vitamin D analogue; Other
Lead sponsor: University of Colorado, Denver; Other
Eligibility: 18 Years and older
Enrollment: 92 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Lynchburg, Virginia

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

Conditions: Healthy Subjects, Vitamin D Deficiency
Interventions: ergocalciferol; Drug
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years to 80 Years
Enrollment: 99 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2007 – 2012
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Breast Cancer Prevention, Mammographic Density
Interventions: Ultrasound-guided core needle biopsy, Denosumab, Blood draw, Calcium, Vitamin D; Procedure · Drug
Lead sponsor: Washington University School of Medicine; Other
Eligibility: 35 Years and older · Female only
Enrollment: 10 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018
U.S. locations: 1
States / cities: St Louis, Missouri

Conditions: brca1 Mutation Carrier, brca2 Mutation Carrier, Breast Cancer
Interventions: cholecalciferol, placebo; Dietary Supplement · Other
Lead sponsor: SWOG Cancer Research Network; Network
Eligibility: 18 Years to 50 Years · Female only
Enrollment: 208 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2017
U.S. locations: 360
States / cities: Anniston, Alabama • Mobile, Alabama • Anchorage, Alaska + 230 more

Conditions: Unspecified Adult Solid Tumor, Protocol Specific
Interventions: calcitriol, dexamethasone, gefitinib; Dietary Supplement · Drug
Lead sponsor: Roswell Park Cancer Institute; Other
Eligibility: 18 Years and older
Enrollment: 53 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2002 – 2007
U.S. locations: 1
States / cities: Buffalo, New York

Conditions: Hypertension, Left Ventricular Hypertrophy
Interventions: cholecalciferol (Vitamin D), Placebo; Dietary Supplement
Lead sponsor: Wayne State University; Other
Eligibility: 30 Years to 74 Years
Enrollment: 354 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Detroit, Michigan

Conditions: HIV Infection, Bone Mass
Interventions: cholecalciferol plus calcium carbonate; Dietary Supplement
Lead sponsor: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK); NIH
Eligibility: 6 Years to 16 Years
Enrollment: 59 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2006
U.S. locations: 1
States / cities: New York, New York

Conditions: Chronic Sinusitis
Interventions: vitamin D placebo, Vitamin D; Dietary Supplement
Lead sponsor: University of Chicago; Other
Eligibility: 18 Years and older
Enrollment: 30 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: Hip Fracture
Interventions: Nutrition, PUSH, PULSE; Dietary Supplement · Behavioral
Lead sponsor: University of Maryland, Baltimore; Other
Eligibility: 60 Years and older
Enrollment: 210 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2017
U.S. locations: 4
States / cities: Farmington, Connecticut • Baltimore, Maryland • Lebanon, New Hampshire + 1 more

Conditions: Obesity, Vitamin D Deficiency
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of Pittsburgh; Other
Eligibility: 10 Years to 18 Years
Enrollment: 225 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2018
U.S. locations: 1
States / cities: Pittsburgh, Pennsylvania

Conditions: Chronic Kidney Disease, End Stage Kidney Disease, Chronic Kidney Disease Mineral and Bone Disorder, Renal Osteodystrophy, Secondary Hyperparathyroidism
Interventions: Kidney disease; Other
Lead sponsor: Columbia University; Other
Eligibility: 40 Years and older
Enrollment: 50 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2020
U.S. locations: 1
States / cities: New York, New York

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Calcitriol and Carboplatin in Treating Patients With Stage IV Prostate Cancer That Has Not Responded to Hormone Therapy

A Study of Bonviva (Ibandronate) in Women With Post-Menopausal Osteoporosis Who Have Received Previous Bonviva Treatment

Vitamin D to Slow Progression of Knee Osteoarthritis

Evaluation of Vitamin D Requirements During Pregnancy

Stanford University Neurofiber Study

Vitamin D for Women at Increased Risk of Developing Ovarian, Fallopian, or Primary Peritoneal Cancer

Relationships Between Vitamin D and Orthopedic Trauma

Phase 2/3 Study of ALK-001 in Geographic Atrophy

A Pilot Study of Vitamin D in Boys With X-linked Adrenoleukodystrophy

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

The Effects of Active VItamin D on Left Atrial Volume Index

Introduction and Maintenance of Still Eating Protein Blends in Support of Infant Nutritional Goals

Trial to Optimize Mineral Outcomes in Dialysis Patients

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

hCAP18 Levels and Vitamin D Deficiency in Healthy Subjects

RANKL Inhibition and Breast Tissue Biomarkers

S0812 High Dose Cholecalciferol in Premenopausal Women at High-Risk for Breast Cancer

Calcitriol and Gefitinib With or Without Dexamethasone in Treating Patients With Advanced Solid Tumors

Vitamin D Therapy to Reduce Cardiac Damage Among Vulnerable Hypertensive Patients

The Effect of Vitamin D and Calcium on Bone in Pediatric HIV

Vitamin D for Chronic Sinusitis

Improving Community Ambulation After Hip Fracture

Vitamin D and Vascular Health in Children

Pathogenesis of Compromised Bone Quality and Mechanics in Chronic Kidney Disease