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ClinicalTrials.gov public records Last synced Nov 15, 2026, 2:02 PM 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 505–528 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Breast Cancer, Lung Cancer, Metastatic Cancer, Pain, Prostate Cancer
Interventions: Calcium, Vitamin D, zoledronic acid, Sm-153, Sr-89; Dietary Supplement · Drug · Radiation
Lead sponsor: Radiation Therapy Oncology Group; Network
Eligibility: 18 Years and older
Enrollment: 261 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2017
U.S. locations: 147
States / cities: Mobile, Alabama • Burbank, California • Carmichael, California + 116 more

Conditions: Osteoporosis, Bone Loss, Fragility Fractures
Interventions: Intravenous zoledronic acid, Vitamin D 800 IU/daily, Calcium 1200 mg/daily; Drug · Dietary Supplement
Lead sponsor: University of Pittsburgh; Other
Eligibility: 65 Years and older · Female only
Enrollment: 181 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2014
U.S. locations: 1
States / cities: Pittsburgh, Pennsylvania

Conditions: Urticaria
Interventions: Vitamin D (4,000 IU/day), Vitamin D (400 IU/day), Omalizumab; Dietary Supplement · Drug
Lead sponsor: Selina Gierer, D.O.; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2019
U.S. locations: 1
States / cities: Kansas City, Kansas

Conditions: Vitamin D Deficiency
Interventions: Not listed
Lead sponsor: University Hospitals Cleveland Medical Center; Other
Eligibility: 8 Years to 25 Years
Enrollment: 290 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2014
U.S. locations: 2
States / cities: Atlanta, Georgia • Cleveland, Ohio

Conditions: Anemia
Interventions: Vitamin D3 ., omega-3 fatty acids (fish oil), Vitamin D3 placebo, Fish oil placebo; Dietary Supplement · Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 50 Years and older
Enrollment: 2,000 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2025
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Osteoporosis
Interventions: Teriparatide, Risedronate, Placebo, Calcium, Vitamin D; Drug · Dietary Supplement
Lead sponsor: Eli Lilly and Company; Industry
Eligibility: 50 Years and older
Enrollment: 224 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2015
U.S. locations: 6
States / cities: Fort Lauderdale, Florida • New Port Richey, Florida • Orlando, Florida + 3 more

Conditions: Pruritis
Interventions: 50,000 Units Ergocalciferol, Placebo; Drug
Lead sponsor: Winthrop University Hospital; Other
Eligibility: 18 Years to 85 Years
Enrollment: 50 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2012
U.S. locations: 2
States / cities: Bethpage, New York • Mineola, New York

Conditions: Vitamin D Deficiency
Interventions: Vitamin D2, Placebo; Drug
Lead sponsor: NYU Langone Health; Other
Eligibility: 12 Years to 18 Years
Enrollment: 20 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2015
U.S. locations: 1
States / cities: New York, New York

Conditions: Rickets
Interventions: Not listed
Lead sponsor: Agency for Healthcare Research and Quality (AHRQ); Federal
Eligibility: 6 Months to 15 Months
Enrollment: 246 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2006 – 2008
U.S. locations: 1
States / cities: Seattle, Washington

Conditions: Crohn's Disease, Vitamin D Deficiency
Interventions: Cholecalciferol; Drug
Lead sponsor: University of California, Los Angeles; Other
Eligibility: 8 Years to 18 Years
Enrollment: 3 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2017
U.S. locations: 1
States / cities: Los Angeles, California

Conditions: Nonalcoholic Fatty Liver
Interventions: Vitamind D; Dietary Supplement
Lead sponsor: The Cleveland Clinic; Other
Eligibility: 18 Years and older
Enrollment: 48 participants
Timeline: 2012 – 2017
U.S. locations: 1
States / cities: Cleveland, Ohio

Conditions: Osteoporosis, Osteopenia, Vitamin D Deficiency, Hypoparathyroidism, Hypercalciuria, Hypercalcemia
Interventions: Vitamin D; Drug
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 50 Years to 66 Years · Female only
Enrollment: 19 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2005 – 2008
U.S. locations: 1
States / cities: Madison, Wisconsin

Conditions: Aggressive Non-Hodgkin Lymphoma, Anaplastic Large Cell Lymphoma, Angioimmunoblastic T-Cell Lymphoma, Chronic Lymphocytic Leukemia, Diffuse Large B-Cell Lymphoma, Enteropathy-Associated T-Cell Lymphoma, Hepatosplenic T-Cell Lymphoma, Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma, Mediastinal (Thymic) Large B-Cell Lymphoma, Nasal Type Extranodal NK/T-Cell Lymphoma, Peripheral T-Cell Lymphoma, Not Otherwise Specified, Primary Cutaneous Anaplastic Large Cell Lymphoma, Refractory Anaplastic Large Cell Lymphoma, Small Lymphocytic Lymphoma, Subcutaneous Panniculitis-Like T-Cell Lymphoma
Interventions: Cholecalciferol, Laboratory Biomarker Analysis; Dietary Supplement · Other
Lead sponsor: Mayo Clinic; Other
Eligibility: 18 Years and older
Enrollment: 565 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2028
U.S. locations: 5
States / cities: Scottsdale, Arizona • Atlanta, Georgia • Iowa City, Iowa + 2 more

Conditions: Rhinitis
Interventions: Vitamin D versus placebo; Dietary Supplement
Lead sponsor: Rohr and Columbo Asthma, Allergy and Immunology Specialists, P.C.; Other
Eligibility: 65 Years and older
Enrollment: 15 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2014
U.S. locations: 2
States / cities: Bryn Mawr, Pennsylvania

Conditions: Prostate Cancer
Interventions: cholecalciferol; Dietary Supplement
Lead sponsor: Roswell Park Cancer Institute; Other
Eligibility: 18 Years to 120 Years · Male only
Enrollment: 148 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2013
U.S. locations: 1
States / cities: Buffalo, New York

Conditions: Cognitive Decline
Interventions: 540,000 IU vitamin D3, Placebo; Drug
Lead sponsor: Vanderbilt University Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 95 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018 – 2020
U.S. locations: 7
States / cities: Aurora, Colorado • Boston, Massachusetts • New York, New York + 3 more

Conditions: Colorectal Cancer, Precancerous Condition
Interventions: cholecalciferol, placebo; Dietary Supplement · Other
Lead sponsor: Northwestern University; Other
Eligibility: 50 Years and older
Enrollment: 22 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2012
U.S. locations: 2
States / cities: Chicago, Illinois

Conditions: Healthy Participants
Interventions: Influenza virus vaccine, Vitamins A and D, Placebo; Biological · Dietary Supplement · Other
Lead sponsor: St. Jude Children's Research Hospital; Other
Eligibility: 2 Years to 8 Years
Enrollment: 87 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2016 – 2018
U.S. locations: 1
States / cities: Memphis, Tennessee

Conditions: Metabolic Syndrome
Interventions: Professional nutrition counseling, No professional nutrition counseling; Other
Lead sponsor: Madigan Army Medical Center; Federal
Eligibility: 18 Years to 45 Years
Enrollment: 138 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2019 – 2021
U.S. locations: 1
States / cities: Tacoma, Washington

Conditions: Insulin Sensitivity
Interventions: Not listed
Lead sponsor: University of Illinois Chicago; Other
Eligibility: 21 Years to 49 Years · Female only
Enrollment: 76 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2013
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: COVID-19, SARS-CoV 2
Interventions: Hydroxychloroquine, Vitamin D; Drug · Dietary Supplement
Lead sponsor: Sanford Health; Other
Eligibility: 18 Years and older
Enrollment: 1 participant
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2021
U.S. locations: 1
States / cities: Sioux Falls, South Dakota

Conditions: Premature Infants
Interventions: Vitamin D, Placebo; Dietary Supplement
Lead sponsor: Baylor College of Medicine; Other
Eligibility: Not listed
Enrollment: 39 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2016
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Pulmonary Disease, Chronic Obstructive, Osteoporosis
Interventions: Vital signs, Urine Pregnancy Test, Questionnaires, Blood Test, Duel-energy X-ray absorptiometry scan, Multi-detector computed tomography, Dual-energy X-ray absorptiometry scan; Diagnostic Test · Other
Lead sponsor: Punam K Saha; Other
Eligibility: 45 Years to 90 Years
Enrollment: 560 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2019 – 2025
U.S. locations: 2
States / cities: Iowa City, Iowa • New York, New York

Conditions: Vitamin D Deficiency, Sarcopenia
Interventions: vitamin D3, Placebo; Dietary Supplement · Other
Lead sponsor: Tufts University; Other
Eligibility: 60 Years to 85 Years
Enrollment: 100 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2018
U.S. locations: 1
States / cities: Boston, Massachusetts

Search by objective public record fields.

Zoledronate, Vitamin D, and Calcium With or Without Strontium 89 or Samarium 153 in Preventing or Delaying Bone Problems in Patients With Bone Metastases From Prostate Cancer, Lung Cancer, or Breast Cancer

Zoledronic Acid for Osteoporosis in the Elderly

Sustained Effect of Urticaria Remission With Relatively High Dose Vitamin D Supplementation After Omalizumab Discontinuation

Vitamin D and HIV-Cardiovascular Disease in Children and Young Adults

Effects of Vitamin D and Marine Omega-3 Fatty Acids on Anemia

A Study That Will Compare the Effect of Two Drugs on Participants With Low Bone Mass and a Recent Hip Fracture

A Study of Oral Ergocalciferol to Treat Pruritis in Hemodialysis Patients

Efficacy of Vitamin D Therapy on Glucose Homeostasis in Obese Adolescents

Study to Assess the Use of a Simple Lab Test to Screen for Rickets in Children

Vitamin D Supplementation as Non-toxic Immunomodulation in Children With Crohn's Disease

Vitamin D Replacement in Nonalcoholic Fatty Liver Disease

Does Treatment of Hypovitaminosis D Increase Calcium Absorption?

Cholecalciferol in Improving Survival in Patients With Newly Diagnosed Cancer With Vitamin D Insufficiency

Rhinitis in the Elderly: The Role of Vitamin D

Vitamin D in Treating Patients With Prostate Cancer

Vitamin D to Improve Outcomes by Leveraging Early Treatment: Long-term Brain Outcomes in Vitamin D Deficient Patients

Vitamin D Supplement in Preventing Colon Cancer in African Americans With Colon Polyps

Influenza Virus Vaccine Plus Vitamin A and D Supplements for Prevention of Respiratory Virus Infections in Children

Precision Nutrition Impact on Health-Related Behavior Change

Association Between Vitamin D and Inflammation and Diabetes Risk in Morbidly Obese Pre-Menopausal Women

Hydroxychloroquine as Post-Exposure Prophylaxis Against COVID-19 Infection

Effect of Vitamin D in Diets of Preterm Infants

CT-Based Modeling of Bone Micro-Architecture and Fracture-Risk in COPD

Impact of Vitamin D on 25-hydroxyvitamin D Levels and Physical Function