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ClinicalTrials.gov public records Last synced Nov 15, 2026, 6:34 AM EST

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Showing 1–24 of 101 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Oral Vitamin D Supplementation Clear all

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: 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: Osteoporosis, Aging
Interventions: Vitamin D3, Calcium Citrate (Citracal); Dietary Supplement
Lead sponsor: Creighton University; Other
Eligibility: 57 Years and older · Female only
Enrollment: 273 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2011
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Healthy, no Evidence of Disease, Skin Cancer
Interventions: cholecalciferol; Drug
Lead sponsor: National Cancer Institute (NCI); NIH
Eligibility: 40 Years and older
Enrollment: 25 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Tucson, Arizona

Conditions: Asthma, Vitamin D Deficiency
Interventions: Vitamin D2 + vitamin D3, Vitamin D3; Drug
Lead sponsor: Nationwide Children's Hospital; Other
Eligibility: 8 Years to 17 Years
Enrollment: 18 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2016
U.S. locations: 1
States / cities: Columbus, Ohio

Conditions: Femoral Fracture, Fragility Fracture, Muscle Atrophy
Interventions: Essential Amino Acid Supplementation; Combination Product
Lead sponsor: Michael C Willey; Other
Eligibility: 65 Years and older
Enrollment: 60 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2024 – 2026
U.S. locations: 2
States / cities: Iowa City, Iowa • Eugene, Oregon

Conditions: Skin Irritation
Interventions: 4 placebo, 4 Vitamin D, Valchlor; Dietary Supplement · Drug
Lead sponsor: University Hospitals Cleveland Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 33 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2018
U.S. locations: 1
States / cities: Cleveland, Ohio

Conditions: Vitamin D Deficiency, Hypertension
Interventions: Aliskiren, Cholecalciferol, Placebo; Drug · Dietary Supplement
Lead sponsor: UConn Health; Other
Eligibility: 21 Years and older
Enrollment: 40 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Farmington, Connecticut

Conditions: Vitamin D Deficiency
Interventions: Oral Vitamin D Supplementation; Drug
Lead sponsor: Winthrop University Hospital; Other
Eligibility: 18 Years to 65 Years
Enrollment: 150 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2004 – 2006
U.S. locations: 1
States / cities: Mineola, New York

Conditions: X-linked Hypophosphatemia, Hypophosphatemic Rickets, Hypophosphatemic Rickets, X-Linked Dominant
Interventions: Calcitriol; Drug
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 3 Years to 70 Years
Enrollment: 16 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2026
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Hypertension, Vitamin D Deficiency, Pre-Hypertension
Interventions: Cholecalciferol; Drug
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years to 50 Years
Enrollment: 534 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2013
U.S. locations: 3
States / cities: Hartford, Connecticut • Boston, Massachusetts • Minneapolis, Minnesota

Conditions: Polycystic Ovary Syndrome
Interventions: Vitamin D, Placebo; Dietary Supplement · Drug
Lead sponsor: Milton S. Hershey Medical Center; Other
Eligibility: 18 Years to 45 Years · Female only
Enrollment: 36 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2014
U.S. locations: 1
States / cities: Hershey, Pennsylvania

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: Knee Osteoarthritis
Interventions: Vitamin D, Control; Drug
Lead sponsor: Rush University Medical Center; Other
Eligibility: 18 Years to 80 Years
Enrollment: 137 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2020 – 2022
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: Hypoparathyroidism
Interventions: Synthetic Human Parathyroid Hormone 1-34, Calcitriol & Calcium; Drug
Lead sponsor: Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD); NIH
Eligibility: 17 Years to 69 Years
Enrollment: 27 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 1991 – 2014
U.S. locations: 1
States / cities: Bethesda, Maryland

Conditions: IBD, Ulcerative Colitis, Crohn Disease
Interventions: Vitamin D3; Drug
Lead sponsor: Boston Children's Hospital; Other
Eligibility: 7 Years to 25 Years
Enrollment: 50 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2023
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Type 2 Diabetes
Interventions: Cholecalciferol; Drug
Lead sponsor: Florida International University; Other
Eligibility: 30 Years to 70 Years
Enrollment: 92 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2013
U.S. locations: 1
States / cities: Miami, Florida

Conditions: Vitamin D Insufficiency, Vitamin D Deficiency
Interventions: Cholecalciferol (vitamin D3); Dietary Supplement
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 55 Years and older · Female only
Enrollment: 108 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2007 – 2011
U.S. locations: 1
States / cities: Madison, Wisconsin

Conditions: Asthma
Interventions: Cholecalciferol; Dietary Supplement
Lead sponsor: University of Pittsburgh; Other
Eligibility: 6 Years to 14 Years
Enrollment: 48 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2015
U.S. locations: 1
States / cities: Pittsburgh, Pennsylvania

Conditions: HIV Infections, AIDS
Interventions: Cholecalciferol (Vit D3); Drug
Lead sponsor: Children's Hospital of Philadelphia; Other
Eligibility: 5 Years to 24 Years
Enrollment: 44 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Philadelphia, Pennsylvania

Conditions: Vitamin D Deficiency, Rickets, Infant Nutrition Disorders
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Mayo Clinic; Other
Eligibility: 1 Month to 50 Years
Enrollment: 80 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Rochester, Minnesota

Conditions: Cardiovascular Disease, Vitamin D Deficiency
Interventions: Vitamin D3, Placebo; Dietary Supplement
Lead sponsor: Intermountain Health Care, Inc.; Other
Eligibility: 18 Years and older
Enrollment: 150 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2015 – 2020
U.S. locations: 1
States / cities: Murray, Utah

Conditions: Gingivitis
Interventions: vitamin D3, Placebo; Drug · Other
Lead sponsor: Boston University; Other
Eligibility: 18 Years to 64 Years
Enrollment: 35 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2011
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Hypophosphatemia, Renal Transplant
Interventions: Cinacalcet, Placebo; Drug
Lead sponsor: Montefiore Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 40 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2015
U.S. locations: 1
States / cities: The Bronx, New York

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Vitamin Supplementation After Bariatric Surgery

Vitamin D3 Supplementation Pilot Study

Vitamin D Supplementation in Older Women

Vitamin D Levels in the Skin of Healthy Subjects After Oral Supplementation

Vitamin D in Pediatric Asthma: a Randomized Controlled Open-label Pilot Trial

Essential Amino Acid Supplementation for Femoral Fragility Fractures

Effect of Vitamin D After Application With Valchlor

Vitamin D Deficiency in Patients With Hypertension

Optimizing Vitamin D Nutrition in Healthy Adults

Calcitriol Monotherapy for X-Linked Hypophosphatemia

DAYLIGHT: Vitamin D Therapy in Individuals at High Risk of Hypertension

Vitamin D for the Treatment of Women With Polycystic Ovary Syndrome (PCOS)

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

Evaluating Vitamin D3 Supplement on Post-Op Outcomes

Treatment of Hypoparathyroidism With Synthetic Human Parathyroid Hormone 1-34

High Dose Interval Vitamin D Supplementation in Patients With IBD Receiving Remicade

Vitamin D Supplementation on Cardiovascular Risk Factors

Vitamin D Inadequacy in Rural Populations, Evaluation of Correction by Food Supplementation

Vitamin D and Severe Asthma Exacerbations

Vitamin D Dose Finding Study

Vitamin D Supplementation in Breastfeeding Women

Acute Effect of Systemic Stress on Measured Blood Concentrations of 25 (OH) Vitamin D

Dose-dependent Anti-inflammatory Effects of Vitamin D in a Human Gingivitis Model

Using Cinacalcet to Treat the Hypophosphatemia of Early Kidney Transplant