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ClinicalTrials.gov public records Last synced Nov 15, 2026, 6:58 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 121–144 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Vitamin D Deficiency, Osteoporosis, Osteopenia
Interventions: Calcium 500mg with 200 IU Vitamin D - 2 tablets daily, Blood levels of Vitamin D, Serum CTX, Mg, Ca++ and iPTH, Usual sun exposure documentation, Dietary intake of calcium, vitamin D, magnesium; Drug · Procedure · Behavioral
Lead sponsor: McLennan County Medical Education and Research Foundation; Other
Eligibility: 70 Years and older · Female only
Enrollment: 60 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2006 – 2007
U.S. locations: 1
States / cities: Waco, Texas

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: Bone Metabolism Biomarkers, Bone Mineral Density, Physical Fitness
Interventions: Vitamin D3, Physical Activity; Drug · Behavioral
Lead sponsor: University of Rochester; Other
Eligibility: 18 Years to 99 Years · Female only
Enrollment: 191 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2026
U.S. locations: 1
States / cities: Rochester, New York

Conditions: Bariatric Surgery
Interventions: Not listed
Lead sponsor: Texas Tech University; Other
Eligibility: 18 Years to 60 Years
Enrollment: 31 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Lubbock, Texas

Conditions: Polycystic Ovarian Syndrome, Vitamin D Deficiency
Interventions: Vitamin D2 (Ergocalciferol), Medroxyprogesterone (Provera), Vitamin D3 (Cholecalciferol), Elemental Calcium; Dietary Supplement · Drug
Lead sponsor: Yale University; Other
Eligibility: 18 Years to 40 Years · Female only
Enrollment: 36 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2013
U.S. locations: 1
States / cities: New Haven, Connecticut

Conditions: Crohn's Disease, Vitamin D Deficiency
Interventions: Cholecalciferol 10,000 IU, Cholecalciferol 400 IU; Drug
Lead sponsor: University of Michigan; Other
Eligibility: 18 Years to 75 Years
Enrollment: 11 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2015 – 2016
U.S. locations: 4
States / cities: Indianapolis, Indiana • Iowa City, Iowa • Ann Arbor, Michigan + 1 more

Conditions: Prostate Cancer
Interventions: Docetaxel plus doxercalciferol, Docetaxel plus placebo; Drug
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 18 Years and older · Male only
Enrollment: 70 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2002 – 2007
U.S. locations: 1
States / cities: Madison, Wisconsin

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: 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: 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: Breast Cancer
Interventions: Raloxifene followed by combination therapy, Exemestane followed by combination therapy; Drug
Lead sponsor: Memorial Sloan Kettering Cancer Center; Other
Eligibility: 18 Years and older · Female only
Enrollment: 11 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 1999 – 2008
U.S. locations: 1
States / cities: New York, New York

Conditions: Benign Breast Disease
Interventions: Vitamin D and fish oil placebo, Fish oil and vitamin D placebo, Vitamin D placebo and fish oil placebo, Vitamin D and fish oil; Dietary Supplement
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 55 Years to 67 Years · Female only
Enrollment: 3,894 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2023
U.S. locations: 1
States / cities: Boston, Massachusetts

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: Knee Osteoarthritis
Interventions: Stem Cell Support Formula, Placebo; Dietary Supplement
Lead sponsor: Regenexx, LLC; Industry
Eligibility: 18 Years to 80 Years
Enrollment: 80 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2021 – 2022
U.S. locations: 2
States / cities: Broomfield, Colorado • Lone Tree, Colorado

Conditions: Vitamin D Deficiency
Interventions: Vitamin D-enriched mushrooms, Study Powder; Other
Lead sponsor: Purdue University; Other
Eligibility: 30 Years to 69 Years
Enrollment: 36 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2022 – 2024
U.S. locations: 1
States / cities: West Lafayette, Indiana

Conditions: Healthy Volunteers
Interventions: Not listed
Lead sponsor: Oregon Health and Science University; Other
Eligibility: 60 Years and older
Enrollment: 25 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2014
U.S. locations: 1
States / cities: Portland, Oregon

Conditions: Adult Stem Cell Proliferation
Interventions: NutraStem, Placebo; Drug
Lead sponsor: University of North Texas Health Science Center; Other
Eligibility: 50 Years to 70 Years
Enrollment: 23 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2017
U.S. locations: 1
States / cities: Fort Worth, Texas

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: Osteoporosis, Postmenopausal, Osteoporosis, Osteoporotic Fractures
Interventions: denosumab, Placebo, Calcium and Vitamin D; Drug · Dietary Supplement
Lead sponsor: Susan L. Greenspan; Other
Eligibility: 65 Years and older
Enrollment: 201 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2023
U.S. locations: 1
States / cities: Pittsburgh, Pennsylvania

Conditions: Mental Health, Vitamin D
Interventions: Placebo, Low dose Omega 3, High dose Omega 3; Dietary Supplement
Lead sponsor: University of Colorado, Colorado Springs; Other
Eligibility: 18 Years to 27 Years
Enrollment: 103 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2024 – 2025
U.S. locations: 1
States / cities: Colorado Springs, Colorado

Conditions: Diabetes Mellitus, Type 2, Hypertension, Vitamin D Deficiency
Interventions: Blood draw; Diagnostic Test
Lead sponsor: Washington University School of Medicine; Other
Eligibility: 25 Years to 80 Years
Enrollment: 40 participants
Timeline: 2017 – 2026
U.S. locations: 2
States / cities: St Louis, Missouri

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: Nutrition, Healthy
Interventions: DHA/EPA fortified chicken plus Placebo, non-25(OH)D fortified chicken/eggs plus vitamin D3 supplement, non-DHA bio-enhanced chicken plus supplement DHA Omega-3, 25(OH)D bioenhanced chicken and eggs plus placebo, Dietary Supplement: DHA/EPA fortified eggs plus Placebo, non-DHA bio-enhanced eggs plus supplement DHA Omega-3, non-25(OH)D fortified chicken/eggs plus placebo; Dietary Supplement · Other
Lead sponsor: Cornell University; Other
Eligibility: 18 Years to 35 Years
Enrollment: 98 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2021 – 2026
U.S. locations: 1
States / cities: Ithaca, New York

Conditions: Colorectal Cancer, Colon Cancer
Interventions: Aspirin, Vitamin D, Diet, Physical Activity, Behavioral Support Counseling Sessions; Drug · Dietary Supplement · Other + 1 more
Lead sponsor: M.D. Anderson Cancer Center; Other
Eligibility: 18 Years and older
Enrollment: 16 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2021 – 2026
U.S. locations: 1
States / cities: Houston, Texas

Search by objective public record fields.

Vitamin D Deficiency in Elderly African American Women in Central Texas

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

Vitamin D and Physical Activity on Bone Health

Impact of Monthly High Dose Oral Cholecalciferol on Serum 25 Hydroxy Vitamin D Levels in Bariatric Surgery Subjects

Health Benefits of Vitamin D and Calcium in Women With PCOS (Polycystic Ovarian Syndrome)

Trial of High Dose Vitamin D in Patient's With Crohn's Disease

Study of Docetaxel With Doxercalciferol or Placebo for Advanced Prostate Cancer

Vitamin D Supplementation on Cardiovascular Risk Factors

Impact of Vitamin D Supplementation on Cardiac Structure and Function

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

Combined Estrogen Blockade of the Breast With Exemestane and Raloxifene in Postmenopausal Women With a History of Breast Cancer Who Have No Clinical Evidence of Disease

VITamin D and OmegA-3 TriaL: Effects on Mammographic Density and Breast Tissue

Vitamin D and Severe Asthma Exacerbations

Randomized Trial of Regenexx Stem Cell Support Formula

Effects of Vitamin D-Enriched Mushrooms on Vitamin D Status and Immune Function and Inflammatory Status in Adults

Strength and Balance in Gender- and Age-Matched Controls

Exercise and NutraStem (NT-020): Effects on Stem Cells

Vitamin D Dose Finding Study

Preventing Osteoporosis Using Denosumab

Omega-3 Supplementation and Mental Health in College Students

Vitamin D and Immune Mechanisms of Hypertension in Type 2 Diabetics

Vitamin D Supplementation in Breastfeeding Women

Bioavailability of Vitamin D(25(OH)D) and Omega-3 Fatty Acid (DHA) Enhanced Chicken

DAILY: Vitamin D, Aspirin, ExercIse, Low Saturated Fat Foods StudY in Colorectal Cancer Patients With Minimal Residual Disease