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ClinicalTrials.gov public records Last synced Nov 15, 2026, 5:34 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 1–24 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Alzheimer Disease
Interventions: Ketogenic Diet, Therapeutic Lifestyles Changes Diet; Behavioral
Lead sponsor: University of Kansas Medical Center; Other
Eligibility: 50 Years to 90 Years
Enrollment: 84 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2025
U.S. locations: 1
States / cities: Fairway, Kansas

Conditions: Obesity, Vitamin D Deficiency
Interventions: Vitamin D3 and Calcium; Dietary Supplement
Lead sponsor: Vadim Sherman, MD; Other
Eligibility: 18 Years to 65 Years · Female only
Enrollment: 37 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Houston, Texas

Conditions: COVID-19
Interventions: vitamin D, Placebo; Dietary Supplement
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 18 Years and older
Enrollment: 2,024 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2024
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Arthritis, Rheumatoid, Vitamin D Deficiency
Interventions: Placebo in arm A and Vitamin D in arm B, vitamin D 3 for arm A ,and matching placebo for arm B; Drug
Lead sponsor: Indiana University; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Indianapolis, Indiana

Conditions: Complications of Bariatric Procedures, Avitaminosis
Interventions: Chewable Multivitamin with Iron, PatchMD Vitamin D3/Calcium Patch, PatchMD Multivitamin Patch, PatchMD B12 Energy Plus Patch, Chewable Calcium, Quick Dissolve B12; Dietary Supplement
Lead sponsor: California State Polytechnic University, Pomona; Other
Eligibility: 18 Years to 65 Years
Enrollment: 30 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2016 – 2017
U.S. locations: 1
States / cities: Brea, California

Conditions: Osteopenia, Osteoporosis
Interventions: Micronized Calcium Carbonate, Non-Micronized Calcium Carbonate, Vitamin D3; Dietary Supplement
Lead sponsor: Integrative Health Technologies, Inc.; Network
Eligibility: 21 Years and older
Enrollment: 160 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2014
U.S. locations: 1
States / cities: San Antonio, Texas

Conditions: Vitamin D Deficiency
Interventions: Cholecalciferol; Dietary Supplement
Lead sponsor: Children's Hospital of Philadelphia; Other
Eligibility: 12 Years to 17 Years
Enrollment: 39 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2012
U.S. locations: 1
States / cities: Philadelphia, Pennsylvania

Conditions: Prostate Cancer
Interventions: calcitriol, mitoxantrone hydrochloride, prednisone; Dietary Supplement · Drug
Lead sponsor: OHSU Knight Cancer Institute; Other
Eligibility: 18 Years to 100 Years · Male only
Enrollment: 19 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2004 – 2006
U.S. locations: 1
States / cities: Portland, Oregon

Conditions: Nephrolithiasis, Urolithiasis, Idiopathic Hypercalciuria, Vitamin D Deficiency, Disorder of Vitamin D
Interventions: Ergocalciferol; Drug
Lead sponsor: New York Presbyterian Hospital; Other
Eligibility: 18 Years and older
Enrollment: 30 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: New York, New York

Conditions: Obesity, Vitamin D Deficiency, Hypertension
Interventions: Vitamin D (cholecalciferol); Dietary Supplement
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 18 Years to 64 Years
Enrollment: 26 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Female Hormone Profile
Interventions: Vitamin D (Cholecalciferol ), Placebo Group; Dietary Supplement
Lead sponsor: University of Southern California; Other
Eligibility: 18 Years to 35 Years · Female only
Enrollment: 20 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2025 – 2026
U.S. locations: 1
States / cities: Los Angeles, California

Conditions: Vitamin D Deficiency
Interventions: 400 IU Vitamin D3 (cholecalciferol), 2400 IU Vitamin D3 (cholecalciferol), 6400 IU Vitamin D3 (cholecalciferol); Drug
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years to 45 Years · Female only
Enrollment: 460 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2006 – 2012
U.S. locations: 2
States / cities: Rochester, New York • Charleston, South Carolina

Conditions: Vitamin D Deficiency
Interventions: cholecalciferol, 25(OH)D; Dietary Supplement
Lead sponsor: Creighton University; Other
Eligibility: 20 Years to 60 Years
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Vitamin D Metabolism is in Chronic Kidney Disease
Interventions: 10,000 IU of cholecalciferol for a total of 8 weeks; Drug
Lead sponsor: Memphis VA Medical Center; Federal
Eligibility: 18 Years to 85 Years · Male only
Enrollment: 70 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2012
U.S. locations: 1
States / cities: Memphis, Tennessee

Conditions: Psoriasis
Interventions: Topical Therapy, Phototherapy and Systemic Therapy, Biologic Therapy; Other
Lead sponsor: University of California, Irvine; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2015
U.S. locations: 1
States / cities: Irvine, California

Conditions: Basal Cell Carcinoma, Basal Cell Nevus Syndrome
Interventions: Dietary Vitamin D3 pre-treatment, Photodynamic therapy, Serum Maintenance Vitamin D3; Drug · Radiation
Lead sponsor: Case Comprehensive Cancer Center; Other
Eligibility: Not listed
Enrollment: 37 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018 – 2023
U.S. locations: 2
States / cities: Phoenix, Arizona • Cleveland, Ohio

Conditions: Healthy, Vitamin D Deficiency
Interventions: ergocalciferol, placebo pill; Dietary Supplement · Other
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 9 Years to 18 Years · Female only
Enrollment: 90 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2013
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Stargardt Disease, Stargardt Macular Degeneration, Stargardt Macular Dystrophy, Autosomal Recessive Stargardt Disease 1 (ABCA4-related)
Interventions: ALK-001, Placebo; Drug
Lead sponsor: Alkeus Pharmaceuticals, Inc.; Industry
Eligibility: 8 Years to 70 Years
Enrollment: 160 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2015 – 2028
U.S. locations: 14
States / cities: Phoenix, Arizona • Los Angeles, California • Aurora, Colorado + 11 more

Conditions: Ectonucleotide Pyrophosphatase/Phosphodiesterase1 Deficiency, Autosomal Recessive Hypophosphatemic Rickets, Generalized Arterial Calcification of Infancy
Interventions: INZ-701, Control Arm (Conventional Therapy); Drug
Lead sponsor: Inozyme Pharma; Industry
Eligibility: 1 Year to 12 Years
Enrollment: 27 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2023 – 2026
U.S. locations: 3
States / cities: Chicago, Illinois • Philadelphia, Pennsylvania • Fort Worth, Texas

Conditions: Cancer, Cardiovascular Disease
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: 25,871 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2031
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Psoriasis Vulgaris
Interventions: Calcitriol; Drug
Lead sponsor: Galderma R&D; Industry
Eligibility: 2 Years to 16 Years
Enrollment: 54 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2018
U.S. locations: 8
States / cities: Fort Smith, Arkansas • Rogers, Arkansas • Burbank, California + 5 more

Conditions: Diabetes Mellitus, Chronic Kidney Disease, Diabetic Kidney Disease
Interventions: Cholecalciferol, Placebo; Dietary Supplement
Lead sponsor: University of Washington; Other
Eligibility: 18 Years and older
Enrollment: 22 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2010
U.S. locations: 1
States / cities: Seattle, Washington

Conditions: Vitamin D Deficiency
Interventions: Mushroom Vitamin D2, Cholecalciferol, Vitamin D2 - Ergocalciferol, Mushroom Extract; Dietary Supplement
Lead sponsor: Boston University; Other
Eligibility: 18 Years to 64 Years
Enrollment: 80 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Stem Cell Transplantation
Interventions: Not listed
Lead sponsor: National Heart, Lung, and Blood Institute (NHLBI); NIH
Eligibility: 2 Years to 80 Years
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2018
U.S. locations: 1
States / cities: Bethesda, Maryland

Search by objective public record fields.

Therapeutic Diets in Alzheimer's Disease

Efficacy of Vitamin D Supplementation in Bariatric Surgery Patients

Vitamin D for COVID-19 Trial

Vitamin D Deficiency Causes Immune Dysfunction and Enables or Perpetuates the Development of Rheumatoid Arthritis

Vitamin Supplementation After Bariatric Surgery

A Study of Changes in Bone Mineral Density as a Function of Consuming Two Different Forms of Calcium Carbonate

Vitamin D3 Supplementation Pilot Study

Calcitriol, Mitoxantrone, and Prednisone in Treating Patients With Metastatic Prostate Cancer

Vitamin D Repletion in Stone Formers With Hypercalciuria

Vitamin D Supplementation Reduces Renin-Angiotensin System Activity in Obesity

Acute Vitamin D Supplementation on Testosterone in Females

Establishing the Vitamin D Requirements During Lactation

The Variability of 25-hydroxyvitamin D Response From Crystalline 25-hydroxyvitamin D3

Vitamin D Metabolism in Chronic Kidney Disease Patients

Evaluation of Vitamin D Levels in Psoriasis Patients

Vitamin D as a Nutritional Neoadjuvant During Photodynamic Therapy of Basal Cell Carcinoma

Vitamin D Deficiency in Adolescent Girls

Phase 2 Tolerability and Effects of ALK-001 on Stargardt Disease

The ENERGY 3 Study: Evaluation of Efficacy and Safety of INZ-701 in Children With ENPP1 Deficiency

Vitamin D and Omega-3 Trial (VITAL)

Long Term Safety and Efficacy Study of Calcitriol 3 mcg/g Ointment in Pediatric Subjects With Plaque Psoriasis

Randomized Controlled Trial of Vitamin D3 in Diabetic Kidney Disease

Evaluating Vitamin D Content in Mushrooms

Investigating Cytokine Genes of Stem Cell Donors