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ClinicalTrials.gov public records Last synced Nov 15, 2026, 9:40 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 385–408 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: HIV Infections
Interventions: Alendronate, Calcium carbonate, Vitamin D; Drug
Lead sponsor: National Institute of Allergy and Infectious Diseases (NIAID); NIH
Eligibility: 25 Years and older
Enrollment: 80 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: Ends 2006
U.S. locations: 28
States / cities: Birmingham, Alabama • Los Angeles, California • San Diego, California + 17 more

Conditions: Vitamin D Deficiency, Cardiovascular Diseases
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 55 Years to 75 Years · Female only
Enrollment: 99 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2014
U.S. locations: 3
States / cities: Bowler, Wisconsin • Lac du Flambeau, Wisconsin • Madison, Wisconsin

Conditions: Inflammatory Bowel Disease
Interventions: Vitamin D; Dietary Supplement
Lead sponsor: Penn State University; Other
Eligibility: 18 Years to 70 Years
Enrollment: 21 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2011
U.S. locations: 2
States / cities: Hershey, Pennsylvania • University Park, Pennsylvania

Conditions: Hypoparathyroidism
Interventions: No intervention; Other
Lead sponsor: Takeda; Industry
Eligibility: Not listed
Enrollment: 1,339 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2026
U.S. locations: 54
States / cities: Birmingham, Alabama • Tucson, Arizona • Los Angeles, California + 42 more

Conditions: Coronary Artery Disease, Cardiovascular Disease
Interventions: Vitamin D, No medication; Dietary Supplement · Other
Lead sponsor: Creighton University; Other
Eligibility: 30 Years to 80 Years
Enrollment: 50 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: Started 2010
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Type 2 Diabetes, Obesity
Interventions: Calcitriol, Placebo; Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 18 Years to 70 Years
Enrollment: 41 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2015
U.S. locations: 1
States / cities: Boston, Massachusetts

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

Conditions: Carcinoma, Non-Small-Cell Lung
Interventions: calcitriol + docetaxel; Drug
Lead sponsor: Novacea; Industry
Eligibility: 18 Years and older
Enrollment: 80 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2005
U.S. locations: 11
States / cities: Berkeley, California • Vallejo, California • Denver, Colorado + 8 more

Conditions: Newly Diagnosed Operative Invasive Ductal Breast Carcinoma Stage I-II
Interventions: Vitamin D; Dietary Supplement
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years and older · Female only
Enrollment: 1 participant
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2014
U.S. locations: 1
States / cities: Charleston, South Carolina

Conditions: Infertility,Male, Vitamin D Deficiency
Interventions: Vitamin D; Diagnostic Test
Lead sponsor: Sanford Health; Other
Eligibility: 21 Years to 56 Years · Male only
Enrollment: 230 participants
Timeline: 2019 – 2022
U.S. locations: 1
States / cities: Sioux Falls, South Dakota

Conditions: Asthma
Interventions: Vitamin D 3 cholecalciferol, Vitamin D3; Dietary Supplement
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 18 Years to 39 Years · Female only
Enrollment: 876 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2023
U.S. locations: 3
States / cities: San Diego, California • Boston, Massachusetts • St Louis, Missouri

Conditions: Breast Cancer
Interventions: Biomarkers; Other
Lead sponsor: Sentara Norfolk General Hospital; Other
Eligibility: 18 Years and older · Female only
Enrollment: 30 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2020
U.S. locations: 1
States / cities: Newport News, Virginia

Conditions: Vitamin D Deficiency
Interventions: 400 IU vitamin D3, 2000 IU vitamin D3; Dietary Supplement
Lead sponsor: Boston University; Other
Eligibility: 18 Years to 70 Years
Enrollment: 11 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Atopic Dermatitis, Vitamin D Deficiency, Asthma
Interventions: Not listed
Lead sponsor: Medical College of Wisconsin; Other
Eligibility: 1 Year to 18 Years
Enrollment: 98 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2013
U.S. locations: 1
States / cities: Milwaukee, Wisconsin

Conditions: Breast Cancer, Osteoporosis
Interventions: calcium carbonate, vitamin D, risedronate sodium, placebo; Dietary Supplement · Drug · Other
Lead sponsor: Alliance for Clinical Trials in Oncology; Other
Eligibility: 18 Years and older · Female only
Enrollment: 216 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2008
U.S. locations: 198
States / cities: Mobile, Alabama • Scottsdale, Arizona • Aurora, Colorado + 124 more

Conditions: Breast Cancer
Interventions: Topical Calcipotriene Ointment, Topical Vaseline; Drug · Other
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 50 Years and older
Enrollment: 43 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018 – 2020
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Type 1 Diabetes
Interventions: Vitamin D, Placebo; Drug
Lead sponsor: Nationwide Children's Hospital; Other
Eligibility: 4 Years to 18 Years
Enrollment: 38 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2014
U.S. locations: 1
States / cities: Columbus, Ohio

Conditions: Osteoporosis, Prostate Cancer
Interventions: Calcium, Zoledronic acid, radiation therapy, LHRH, Vitamin D; Dietary Supplement · Radiation · Drug
Lead sponsor: Radiation Therapy Oncology Group; Network
Eligibility: 18 Years and older · Male only
Enrollment: 109 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2014
U.S. locations: 80
States / cities: Chico, California • Los Angeles, California • Pomona, California + 66 more

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

Conditions: Prostatic Neoplasms, Bone Mineral Density Quantitative Trait Locus 3
Interventions: vitamin D, Placebo; Dietary Supplement
Lead sponsor: University of Rochester; Other
Eligibility: 60 Years to 99 Years · Male only
Enrollment: 108 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2016
U.S. locations: 1
States / cities: Rochester, New York

Conditions: Dense Breasts
Interventions: Denosumab, Placebo, Calcium, Vitamin D3, Core needle biopsy, Blood draw; Drug · Procedure
Lead sponsor: Washington University School of Medicine; Other
Eligibility: 40 Years and older · Female only
Enrollment: 210 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2027
U.S. locations: 1
States / cities: St Louis, Missouri

Conditions: End Stage Renal Disease
Interventions: Not listed
Lead sponsor: University of Alberta; Other
Eligibility: 18 Years and older
Enrollment: 30 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2017
U.S. locations: 3
States / cities: Indianapolis, Indiana • Boston, Massachusetts • Seattle, Washington

Conditions: Healthy
Interventions: vitamin D, aerobic training; Dietary Supplement · Other
Lead sponsor: David Travis Thomas; Other
Eligibility: 60 Years and older
Enrollment: 50 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2014 – 2018
U.S. locations: 1
States / cities: Lexington, Kentucky

Conditions: NEUROBLASTOMA
Interventions: Zolendric acid, Cyclophosphamide; Drug
Lead sponsor: Baylor College of Medicine; Other
Eligibility: Up to 30 Years
Enrollment: 21 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2005 – 2013
U.S. locations: 8
States / cities: Los Angeles, California • San Francisco, California • Stanford, California + 5 more

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The Effect of Alendronate, Calcium, and Vitamin D on Bone Mineral Density in HIV Infected Patients

Sunweavers: Supporting Native American Women's Vitamin D Research

Vitamin D Supplementation in Crohn's Patients

A Registry for Participants With Chronic Hypoparathyroidism

Vitamin D and T-Regulatory Cells in Coronary Artery Disease

The VALIDATE-D Study

High Dose Vitamin D for Sickle Cell Disease

Study of DN101 and Taxotere in Patients With Advanced Non-Small Cell Lung Cancer

Vitamin D3 (Vit D3) Supplementation and T Cell Immunomodulation in Patients With Newly Diagnosed Operative Invasive Ductal Breast Carcinoma

Vitamin D and Human Sperm DNA Fragmentation

Randomized Trial: Maternal Vitamin D Supplementation to Prevent Childhood Asthma (VDAART)

Novel Molecular Targets for Ductal Carcinoma In Situ (DCIS)

The Effect Of Vitamin D On Measures Of Bone Health And Gene Expression

Asthma, Missed Immunizations, and Vitamin D Deficiency in Atopic Dermatitis

Risedronate in Preventing Bone Loss in Premenopausal Women Receiving Chemotherapy for Primary Breast Cancer

Topical Calcipotriene Treatment for Breast Cancer Immunoprevention

Effect of Vitamin D on the Honeymoon Period in Children and Adolescents With Type 1 Diabetes

Zoledronate in Preventing Osteoporosis and Bone Fractures in Patients With Locally Advanced Nonmetastatic Prostate Cancer Undergoing Radiation Therapy and Hormone Therapy

Vitamin D Supplementation on Reported Rates of Taxane-Induced Neuropathy

High-dose Vitamin D Supplementation for ADT-induced Side Effects

RANKL Inhibition and Mammographic Breast Density

Risk Factors for Coronary Artery Calcification and Left Ventricular Hypertrophy in Hemodialysis Patients

Vitamin D and Muscle Metabolic Function

Zoledronic Acid (ZOMETA) With Cyclophosphamide With Neuroblastoma and Cortical Bone Involvement