Search | Clinical Trials Finder

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ClinicalTrials.gov public records Last synced Nov 15, 2026, 1:53 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 481–504 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Maternal Stress
Interventions: Vitamin D (Cholecalciferol ), Placebo; Dietary Supplement · Other
Lead sponsor: University of Idaho; Other
Eligibility: 18 Years to 64 Years · Female only
Enrollment: 80 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2024 – 2027
U.S. locations: 2
States / cities: Coeur d'Alene, Idaho • Moscow, Idaho

Conditions: Osteoporosis, Postmenopausal
Interventions: teriparatide, Placebo, Calcium Supplement, Vitamin D Supplement; Drug
Lead sponsor: Eli Lilly and Company; Industry
Eligibility: 30 Years to 85 Years · Female only
Enrollment: 1,637 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 1996 – 1999
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Leukemia, Lymphoma
Interventions: Actonel (Risedronate), Calcium, Vitamin D; Drug · Dietary Supplement
Lead sponsor: M.D. Anderson Cancer Center; Other
Eligibility: 18 Years and older
Enrollment: 72 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2004 – 2014
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Parkinson Disease, Accidental Falls
Interventions: Vitamin D3, calcium, Placebo; Drug · Dietary Supplement · Other
Lead sponsor: VA Office of Research and Development; Federal
Eligibility: 50 Years to 99 Years
Enrollment: 101 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Portland, Oregon

Conditions: Osteoporosis, Cystic Fibrosis
Interventions: alendronate sodium, calcium carbonate, cholecalciferol; Drug
Lead sponsor: University of North Carolina; Other
Eligibility: 18 Years to 45 Years
Enrollment: 60 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 1998 – 2002
U.S. locations: 1
States / cities: Chapel Hill, North Carolina

Conditions: Myelodysplastic Syndrome
Interventions: DN-101 (calcitriol); Drug
Lead sponsor: Novacea; Industry
Eligibility: 18 Years and older
Enrollment: 46 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2002 – 2004
U.S. locations: 10
States / cities: Hoover, Alabama • San Francisco, California • Tampa, Florida + 7 more

Conditions: End Stage Renal Disease
Interventions: Ergocalciferol, Placebo; Drug · Other
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years and older
Enrollment: 105 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2014
U.S. locations: 3
States / cities: Boston, Massachusetts

Conditions: Nutrient Deficiency, Happiness, Digestive Health, Vulnerability to Disease, Mood Swings, Energy
Interventions: Alii Supplement; Dietary Supplement
Lead sponsor: Texas Christian University; Other
Eligibility: 18 Years to 25 Years · Female only
Enrollment: 16 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2026
U.S. locations: 1
States / cities: Fort Worth, Texas

Conditions: Diabetes Mellitus - Type 1, Diabetes Mellitus - Type 2, Non-proliferative Diabetic Retinopathy
Interventions: multi-component nutritional supplement capsules, multi-component dietary supplement; Dietary Supplement
Lead sponsor: ZeaVision, LLC; Industry
Eligibility: 18 Years and older
Enrollment: 70 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2014
U.S. locations: 1
States / cities: Tacoma, Washington

Conditions: HMG-CoA Reductase Inhibitors-related Myalgias
Interventions: cholecalciferol/placebo; Drug
Lead sponsor: Creighton University; Other
Eligibility: 19 Years to 89 Years
Enrollment: 4 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Diarrhoea Predominant Irritable Bowel Syndrome, IBS
Interventions: endoscopy for tissue biopsy, Blood Sample, Stool Sample; Procedure · Other
Lead sponsor: Mayo Clinic; Other
Eligibility: 18 Years to 65 Years
Enrollment: 26 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2016
U.S. locations: 1
States / cities: Scottsdale, Arizona

Conditions: Sarcopenia
Interventions: Placebo, HMB plus Vitamin D, Non-Exercise, Exercise; Dietary Supplement · Drug · Behavioral
Lead sponsor: Metabolic Technologies Inc.; Industry
Eligibility: 60 Years and older
Enrollment: 238 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2014 – 2019
U.S. locations: 1
States / cities: Ames, Iowa

Conditions: Vitamin D Deficiency
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Tufts University; Other
Eligibility: 9 Years to 14 Years
Enrollment: 691 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2013
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Chronic Hepatitis C
Interventions: Not listed
Lead sponsor: Avera McKennan Hospital & University Health Center; Other
Eligibility: 20 Years to 60 Years
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2019
U.S. locations: 1
States / cities: Sioux Falls, South Dakota

Conditions: Chronic Kidney Disease
Interventions: Paricalcitol, Placebo; Drug
Lead sponsor: Amy Barton Pai; Other
Eligibility: 18 Years and older
Enrollment: 41 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Albany, New York

Conditions: Vitamin D Deficiency
Interventions: Ergocalciferol, Calcitriol; Dietary Supplement
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years to 45 Years
Enrollment: 42 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: HIV Infection
Interventions: Vitamin D3 50,000 IU, Vitamin D3 placebo; Dietary Supplement
Lead sponsor: University of North Carolina, Chapel Hill; Other
Eligibility: 16 Years to 24 Years
Enrollment: 214 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2016
U.S. locations: 16
States / cities: Los Angeles, California • Washington D.C., District of Columbia • Fort Lauderdale, Florida + 11 more

Conditions: Vitamin D Deficiency, Nephrolithiasis
Interventions: vitamin D (ergocalciferol); Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2010
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Unspecified Adult Solid Tumor, Protocol Specific
Interventions: calcitriol, dexamethasone, ketoconazole; Dietary Supplement · Drug
Lead sponsor: Roswell Park Cancer Institute; Other
Eligibility: 18 Years and older
Enrollment: 15 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: Started 2004
U.S. locations: 1
States / cities: Buffalo, New York

Conditions: Diabetes Mellitus, Vitamin D Deficiency
Interventions: Vitamin D; Dietary Supplement
Lead sponsor: Ascension Health; Industry
Eligibility: 34 Years to 69 Years
Enrollment: 150 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2012
U.S. locations: 1
States / cities: Flint, Michigan

Conditions: Measure Absorption of Vitamin D in Blood
Interventions: Vitafusion Extra Strength Vitamin D; Dietary Supplement
Lead sponsor: Church & Dwight Company, Inc.; Industry
Eligibility: 18 Years to 45 Years
Enrollment: 31 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2017
U.S. locations: 1
States / cities: Princeton, New Jersey

Conditions: Acute Stress Reaction
Interventions: Vitamin D3 (Cholecalciferol), Oral Placebo Tablet; Dietary Supplement
Lead sponsor: Walter Reed Army Institute of Research (WRAIR); Federal
Eligibility: 18 Years to 40 Years
Enrollment: 52 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2026 – 2027
U.S. locations: 1
States / cities: Silver Spring, Maryland

Conditions: Vitamin D Deficiency, Overweight, Obesity
Interventions: 2000 IU Vitamin D3 daily supplement, 400 IU Vitamin D3 supplement; Dietary Supplement
Lead sponsor: Augusta University; Other
Eligibility: 14 Years to 19 Years
Enrollment: 45 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009
U.S. locations: 1
States / cities: Augusta, Georgia

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

Search by objective public record fields.

Impact of Vitamin D Supplements on Mental Health and Milk Composition in Mothers Living in Idaho

Effects of Teriparatide in the Treatment of Postmenopausal Women With Osteoporosis

A Study of Actonel for the Prevention of Bone Loss

Effects of Vitamin D in Parkinson's Disease (PD)

Randomized Study of Alendronate in Adult Patients With Cystic Fibrosis Related Osteoporosis

Study of High-Dose Pulse Administration DN-101 (Calcitriol) in Patients With Myelodysplastic Syndrome (MDS)

DIVINE: Dialysis Infection and Vitamin D In New England

Alii Supplement Study

Diabetes Visual Function Supplement Study

Vitamin D Replacement: The Effect on Statin-Related Myalgias

Analyzing IBS to Identify Biomarkers and Microbiome Signatures

Nutritional Intervention for Age-related Muscular Function and Strength Losses-Study 2

Impact of Vitamin D Supplementation on Cardiometabolic Risk Factors [The Daily D Health Study]

Vitamin D Deficiency in Subjects With Chronic Hepatitis C Compared to Healthy Volunteers

Vascular Reactivity in Chronic Kidney Disease (CKD) Patients Receiving Paricalcitol Versus Placebo

Different Vitamin D Preparations & FGF23 in Humans

Vitamin D Absorption in HIV Infected Young Adults Being Treated With Tenofovir Containing cART

The Effect of Vitamin D on Urinary Calcium Excretion in Kidney Stone Formers With High Urinary Calcium

Calcitriol, Ketoconazole, and Dexamethasone in Treating Patients With Metastatic or Unresectable Solid Tumors

Effect of Vitamin D Supplementation on Hemoglobin A1c

Bioequivalence Study on Vitamin D in Healthy Adults

The Efficacy of Vitamin D Supplementation to Sustain Performance Outcomes

Vitamin D Supplement Study for Adolescents

Vitamin D and Type 2 Diabetes Study