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ClinicalTrials.gov public records Last synced Nov 15, 2026, 8:50 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 361–384 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Breast Cancer
Interventions: High Dose Vitamin D, Placebo, Standard Dose Vitamin D3, Letrozole 2.5mg; Dietary Supplement · Drug
Lead sponsor: Qamar Khan; Other
Eligibility: 18 Years and older · Female only
Enrollment: 160 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2011
U.S. locations: 2
States / cities: Westwood, Kansas • Wichita, Kansas

Conditions: Infertility, Vitamin D Deficiency
Interventions: Not listed
Lead sponsor: Northwestern University; Other
Eligibility: 18 Years to 38 Years · Female only
Enrollment: 102 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2014
U.S. locations: 3
States / cities: Chicago, Illinois

Conditions: Burns, Bone Demineralization
Interventions: Vitamin D2, Vitamin D3; Dietary Supplement
Lead sponsor: Shriners Hospitals for Children; Other
Eligibility: 6 Months to 18 Years
Enrollment: 50 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2011
U.S. locations: 1
States / cities: Cincinnati, Ohio

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

Conditions: Osteoporosis, Prostate Cancer
Interventions: calcium carbonate, cholecalciferol, Estrogen Antagonists, risedronate sodium, placebo; Dietary Supplement · Drug · Other
Lead sponsor: Alliance for Clinical Trials in Oncology; Other
Eligibility: 18 Years and older · Male only
Enrollment: 71 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2002 – 2010
U.S. locations: 112
States / cities: Scottsdale, Arizona • Jacksonville, Florida • Aurora, Illinois + 71 more

Conditions: Renal Function, Endothelial Function, Blood Pressure, Overweight, Obesity
Interventions: Vitamin D ergocalciferol, Probenecid, Allopurinol, Placebo; Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 18 Years to 75 Years
Enrollment: 242 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Spinal Cord Injuries, Osteoporosis, Metabolic Syndrome
Interventions: Rosuvastatin Calcium, Placebo Oral Tablet, Coenzyme Q10, Calcium Carbonate, Vitamin D; Drug · Dietary Supplement
Lead sponsor: Dr. B. Catharine. Craven; Other
Eligibility: 18 Years to 60 Years
Enrollment: 8 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018 – 2022
U.S. locations: 1
States / cities: Miami, Florida

Conditions: Respiratory Tract Infections, Covid19, Flu Like Illness
Interventions: Vitamin D supplementation; Dietary Supplement
Lead sponsor: Cooper Norcross Health; Other
Eligibility: 18 Years and older
Enrollment: 877 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2023
U.S. locations: 1
States / cities: Camden, New Jersey

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 – 2031
U.S. locations: 2
States / cities: Scottsdale, Arizona • Jacksonville, Florida

Conditions: Opioid Use Disorder
Interventions: [11C]-PHNO, Calcitriol, Placebo Control, PET Scan; Drug · Dietary Supplement · Other + 1 more
Lead sponsor: Yale University; Other
Eligibility: 18 Years to 50 Years
Enrollment: 5 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2024 – 2025
U.S. locations: 1
States / cities: New Haven, Connecticut

Conditions: Vitamin D Deficiency, Renal Failure Chronic Requiring Hemodialysis
Interventions: Ergocalciferol, Placebo; Drug
Lead sponsor: Albany College of Pharmacy and Health Sciences; Other
Eligibility: 18 Years and older
Enrollment: 20 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 4
States / cities: Albany, New York • Clifton Park, New York • Saratoga Springs, New York + 1 more

Conditions: Cystic Fibrosis, Respiratory Tract Infections
Interventions: Cholecalciferol; Dietary Supplement
Lead sponsor: Emory University; Other
Eligibility: 16 Years and older
Enrollment: 91 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2017
U.S. locations: 5
States / cities: Birmingham, Alabama • Atlanta, Georgia • Iowa City, Iowa + 2 more

Conditions: Diabetic Kidney Disease
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years and older
Enrollment: 54 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2013
U.S. locations: 1
States / cities: Charleston, South Carolina

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

Conditions: Asthma, Vitamin D Deficiency, Pediatric Obesity
Interventions: Vitamin D3 oral regimen; Dietary Supplement
Lead sponsor: IDeA States Pediatric Clinical Trials Network; Network
Eligibility: 6 Years to 17 Years
Enrollment: 112 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2021
U.S. locations: 15
States / cities: Little Rock, Arkansas • Wilmington, Delaware • Honolulu, Hawaii + 12 more

Conditions: Dietary Supplement
Interventions: Dietary Supplement: Sprinkled Format REDUCOSE., Reference control, Active comparator; Dietary Supplement · Other
Lead sponsor: Société des Produits Nestlé (SPN); Industry
Eligibility: 19 Years and older
Enrollment: 30 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2021
U.S. locations: 1
States / cities: Tustin, California

Conditions: Cardiovascular Disease, Obesity
Interventions: Not listed
Lead sponsor: Loyola University; Other
Eligibility: 25 Years to 44 Years
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011
U.S. locations: 1
States / cities: Maywood, Illinois

Conditions: Crohn's Disease (CD), Ulcerative Colitis (UC)
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of California, San Francisco; Other
Eligibility: 18 Years and older
Enrollment: 30 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Fresno, California

Conditions: Hot Flushes, Menopause, Premature, Obesity, Vitamin D Deficiency
Interventions: Vitamin D, Placebo; Dietary Supplement · Other
Lead sponsor: Kaiser Permanente; Other
Eligibility: 40 Years to 60 Years · Female only
Enrollment: 23 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2012
U.S. locations: 1
States / cities: Portland, Oregon

Conditions: Muscle Strength, Sarcopenia
Interventions: Placebo, Vitamin D, Beta-hydroxy-Beta-methylbutyrate, Beta-hydroxy-Beta-methylbutyrate and Vitamin D; Dietary Supplement · Drug
Lead sponsor: Metabolic Technologies Inc.; Industry
Eligibility: 60 Years and older
Enrollment: 76 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2013
U.S. locations: 2
States / cities: Ames, Iowa • Brookings, South Dakota

Conditions: Diabetic Nephropathies
Interventions: Calcitriol, Losartan; Dietary Supplement · Drug
Lead sponsor: Weill Cornell Medical College in Qatar; Other
Eligibility: 21 Years to 80 Years
Enrollment: 56 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2015
U.S. locations: 1
States / cities: New York, New York

Conditions: Osteoporosis
Interventions: Teriparatide, Denosumab, Demeclocycline, Tetracycline, Calcium Supplement, Vitamin D; Drug
Lead sponsor: Eli Lilly and Company; Industry
Eligibility: 55 Years to 89 Years · Female only
Enrollment: 69 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2014
U.S. locations: 4
States / cities: Lakewood, Colorado • Gainesville, Georgia • Detroit, Michigan + 1 more

Conditions: Hypertension, Kidney Diseases
Interventions: Vitamin D3, Omega-3 Fatty acids, Vitamin D3 placebo, Fish oil placebo; Dietary Supplement · Drug
Lead sponsor: Albert Einstein College of Medicine; Other
Eligibility: 50 Years to 99 Years
Enrollment: 2,232 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2022
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Postmenopausal Osteoporosis, Gut Microbiota, Cardiovascular Diseases
Interventions: blackcurrant (BC) extract; Drug
Lead sponsor: University of Connecticut; Other
Eligibility: 45 Years to 60 Years · Female only
Enrollment: 51 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2021 – 2022
U.S. locations: 1
States / cities: Storrs, Connecticut

Search by objective public record fields.

Vitamin D3 for Aromatase Inhibitor Induced Arthralgias

Effect of Vitamin D Supplementation on In-vitro Fertilization (IVF) Outcomes

Evaluation of Vitamin D Status in Children With Acute Burns

Personalized Vitamin D Supplementation in European and African Americans

Calcium With or Without Estrogen and/or Risedronate in Preventing Osteoporosis in Patients With Prostate Cancer

Study of Vitamin D and Uric Acid Lowering on Kidney and Blood Vessel Function

Statin Monotherapy for Treatment of Endocrine Metabolic Disease Risk

Vitamin D3 Supplementation to Prevent Respiratory Tract Infections

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

Vitamin D in OUD: Exploration of Alterations on the Dopamine D2/D3 Receptor System

Sustainability of Vitamin D Levels After Repletion With Ergocalciferol In Chronic Kidney Disease Stage 5D

Vitamin D for Enhancing the Immune System in Cystic Fibrosis (DISC Study)

Impact of Vitamin D on Diabetic Kidney Disease in African Americans

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

Vitamin D Oral Replacement in Asthma

Evaluate Effects of Sprinkled Format REDUCOSE in a Carbohydrate-rich, Mixed Meal on Post-prandial Glycemia

Vitamin D Ancillary Study in 5 Populations of African Origin

Supplementation of Vitamin D3 in Patients With Inflammatory Bowel Diseases and Hypovitaminosis D

The Role of Vitamin D in Menopause: Relationship to Menopausal Symptoms in Body Composition

Nutritional Intervention for Age-related Muscular Function and Strength Losses

Intervention Using Vitamin D for Elevated Urinary Albumin Treated With Losartan in Diabetes (IDEAL)

Effects of Teriparatide or Denosumab on Bone in Postmenopausal Women With Osteoporosis

Effects of Vitamin D and Fish Oil on the Kidney in Hypertensives

Blackcurrants Modify Gut Microbiota and Reduce Osteoporosis and CVD Risk