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ClinicalTrials.gov public records Last synced Nov 5, 2026, 10:41 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 1–24 of 769 matching trials from the live ClinicalTrials.gov search.

Filters: Condition: Vitamin D3 Clear all

Conditions: Spinal Cord Injury
Interventions: Vitamin D and Calcium; Dietary Supplement
Lead sponsor: US Department of Veterans Affairs; Federal
Eligibility: 18 Years to 75 Years
Enrollment: 10 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2012
U.S. locations: 1
States / cities: The Bronx, New York

Conditions: Vitamin D Deficiency, Metabolic Syndrome, Prediabetes
Interventions: Mushroom with 600 IU vitamin D2, Mushroom with 4000 IU Vitamin D2, 600 IU Vitamin D3 and untreated mushroom, 4000 IU Vitamin D3 and untreated mushroom, Placebo; Dietary Supplement · Drug
Lead sponsor: Icahn School of Medicine at Mount Sinai; Other
Eligibility: 30 Years to 90 Years
Enrollment: 47 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2013
U.S. locations: 1
States / cities: New York, New York

Conditions: Prediabetes, Type 2 Diabetes
Interventions: Vitamin D (Cholecalciferol), Placebo; Dietary Supplement · Other
Lead sponsor: Tufts Medical Center; Other
Eligibility: 30 Years and older
Enrollment: 2,423 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2018
U.S. locations: 25
States / cities: Phoenix, Arizona • Los Angeles, California • Palo Alto, California + 20 more

Conditions: Vitamin D Deficiency
Interventions: cholecalciferol; Dietary Supplement
Lead sponsor: Tufts University; Other
Eligibility: 50 Years and older
Enrollment: 61 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Breast Cancer, Vitamin D Deficiency
Interventions: Not listed
Lead sponsor: University of Arizona; Other
Eligibility: 18 Years to 75 Years · Female only
Enrollment: 240 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009
U.S. locations: 1
States / cities: Tucson, Arizona

Conditions: Delusion of Reference
Interventions: Endocrine Society UL Dosage Vitamin D, Institute of Medicine Dosage Vitamin D, Calcium; Dietary Supplement
Lead sponsor: Winthrop University Hospital; Other
Eligibility: 50 Years to 90 Years · Female only
Enrollment: 132 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2016
U.S. locations: 1
States / cities: Mineola, New York

Conditions: Ergocalciferol
Interventions: Ergocalciferol; Drug
Lead sponsor: Wake Forest University Health Sciences; Other
Eligibility: 18 Years to 65 Years
Enrollment: 44 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2019 – 2020
U.S. locations: 1
States / cities: Winston-Salem, North Carolina

Conditions: Healthy Volunteers
Interventions: Single High Dose Cholecalciferol, Daily Dose Cholecalciferol; Dietary Supplement
Lead sponsor: Mayo Clinic; Other
Eligibility: 18 Years to 40 Years · Female only
Enrollment: 40 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010
U.S. locations: 1
States / cities: Rochester, Minnesota

Conditions: Respiratory Infection
Interventions: High Dose Vitamin D, Standard Dose Vitamin D, Placebo, Usual Care; Drug · Dietary Supplement
Lead sponsor: University of Colorado, Denver; Other
Eligibility: 60 Years and older
Enrollment: 107 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2016
U.S. locations: 1
States / cities: Aurora, Colorado

Conditions: Plaque Psoriasis, Vitamin D3
Interventions: Triamcinolone, Vitamin D3, Placebo; Drug · Dietary Supplement
Lead sponsor: Wright State University; Other
Eligibility: 18 Years and older
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2026
U.S. locations: 1
States / cities: Fairborn, Ohio

Conditions: Vitamin D, Prematurity
Interventions: Vitamin D3, vitamin D3 placebo; Dietary Supplement
Lead sponsor: University of Nebraska; Other
Eligibility: 5 Minutes to 3 Months
Enrollment: 64 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2010
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Cardiovascular Disease
Interventions: Vitamin D3 + fish oil/fish oil placebo, Vitamin D3 placebo + fish oil/fish oil placebo; Dietary Supplement
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 50 Years and older
Enrollment: 1,025 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2021
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Osteomalacia
Interventions: 68Ga-DOTATATE PET/CT; Combination Product
Lead sponsor: Mayo Clinic; Other
Eligibility: 18 Years and older
Enrollment: 18 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2023
U.S. locations: 1
States / cities: Rochester, Minnesota

Conditions: Vitamin D Deficiency, Hematopoietic Stem Cell Transplantation (HSCT)
Interventions: Oral Thin Film (OTF) Cholecalciferol (Vitamin D3); Dietary Supplement
Lead sponsor: Children's Hospital Medical Center, Cincinnati; Other
Eligibility: Not listed
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2021 – 2022
U.S. locations: 1
States / cities: Cincinnati, Ohio

Conditions: Vitamin D Status, Glucose Tolerance, Blood Pressure, Bone Mineral Density, Hyperlipidemia
Interventions: Vitamin D; Other
Lead sponsor: Baltimore VA Medical Center; Federal
Eligibility: 45 Years to 85 Years
Enrollment: 362 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2022
U.S. locations: 1
States / cities: Baltimore, Maryland

Conditions: Hypophosphatasia (HPP)
Interventions: Asfotase Alfa; Biological
Lead sponsor: Alexion Pharmaceuticals, Inc.; Industry
Eligibility: 18 Years to 80 Years
Enrollment: 6 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2009
U.S. locations: 2
States / cities: St Louis, Missouri • Durham, North Carolina

Conditions: X-linked Hypophosphatemia
Interventions: burosumab; Biological
Lead sponsor: Kyowa Kirin, Inc.; Industry
Eligibility: 5 Years to 12 Years
Enrollment: 52 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2018
U.S. locations: 4
States / cities: San Francisco, California • New Haven, Connecticut • Indianapolis, Indiana + 1 more

Conditions: Cluster Headache
Interventions: Vitamin D, multivitamin, Placebo; Dietary Supplement
Lead sponsor: The University of Texas Health Science Center, Houston; Other
Eligibility: 18 Years to 70 Years
Enrollment: 27 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2021 – 2024
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Burn, Growth, Malnutrition
Interventions: Calcium,Vitamin D, Calcium, VitaminD, Sugar Pill; Dietary Supplement · Other
Lead sponsor: Kathy Prelack, PhD, RD; Other
Eligibility: 4 Years to 18 Years
Enrollment: 60 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2005 – 2007
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Thyroid, PD-1, Cancer
Interventions: blood draw and questionnaire completion, questionnaire completion, blood collection; Other
Lead sponsor: Icahn School of Medicine at Mount Sinai; Other
Eligibility: 18 Years and older
Enrollment: 17 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2021 – 2028
U.S. locations: 1
States / cities: New York, New York

Conditions: Osteoporosis, Renal Osteodystrophy, Kidney Transplant; Complications
Interventions: Denosumab Inj 60 mg/ml, Placebo; Drug · Other
Lead sponsor: Thomas Nickolas, MD MS; Other
Eligibility: 18 Years and older
Enrollment: 8 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2020 – 2021
U.S. locations: 3
States / cities: Chicago, Illinois • Evanston, Illinois • 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: Cognitive Decline, Cognitive Impairment
Interventions: Vitamin D; Other
Lead sponsor: National Institute on Aging (NIA); NIH
Eligibility: 30 Years to 64 Years
Enrollment: 3,720 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2004 – 2013
U.S. locations: 1
States / cities: Baltimore, Maryland

Conditions: Premenstrual Syndrome
Interventions: Measures of calcium and bone turnover; Procedure
Lead sponsor: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK); NIH
Eligibility: 18 Years to 45 Years · Female only
Healthy volunteers: Accepts healthy volunteers
Timeline: 2000 – 2003
U.S. locations: 1
States / cities: New York, New York

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Vitamin D and Calcium Study

Bioavailability and Biological Effects of Vitamin D2 Contained in Mushroom

Vitamin D and Type 2 Diabetes Study

A Pilot Study of the Effect of Dietary Fat Type and Amount on Vitamin D3 Absorption

Epidemiological Analysis of Vitamin D and Breast Cancer Risk in Saudi Arabian Women

Study the Effects of Vitamin D and Calcium Supplementation at Tolerable Upper Limit Doses on Calcium Metabolism.

Pilot Study: The Effect of Ergocalciferol on Plasma Mucin-1 Levels

Pilot Pharmacokinetic Study of Daily Versus Monthly High-Dose Cholecalciferol Supplementation

Vitamin D Supplementation and Acute Respiratory Infection in Older Long-Term Care Residents

Triamcinolone With Vitamin D Synergistic Efficacy in Psoriasis

Vitamin D Status and Dose Response in Infants

Impact of Vitamin D Supplementation on Cardiac Structure and Function

Ga-DOTATATE PET for Phosphaturic Mesenchymal Tumors in Patients With Tumor Induced Osteomalacia

Vitamin D Replacement Using Oral Thin Film (OTF) Cholecalciferol in Patients Undergoing Hematopoietic Stem Cell Transplantation

Vitamin D Retrospective Study and Role With Disease

Safety Study of Human Recombinant Tissue Non-Specific Alkaline Phosphatase Fusion Protein Asfotase Alfa in Adults With Hypophosphatasia (HPP)

Study of KRN23 (Burosumab), a Recombinant Fully Human Monoclonal Antibody Against Fibroblast Growth Factor 23 (FGF23), in Pediatric Subjects With X-linked Hypophosphatemia (XLH)

High Dose Vitamin D Plus Multivitamin in the Prevention of Cluster Headache

Bone Mineral Density, Body Composition and Growth Following Severe Burn Injury

Correlation Vitamin D Level to Endocrine Autoimmune Toxicity Due to Immune Checkpoint Inhibitors

The Effects of 12-months of Denosumab on Bone Density in Prevalent Kidney Transplant Recipients

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

Serum, Dietary and Supplemental Vitamin D's Association With Cognitive Decline

Altered Calcium and Vitamin D in PMDD or Severe PMS