Search | Clinical Trials Finder

These results were retrieved from the live ClinicalTrials.gov registry. Filters and sort order apply to this result list.

ClinicalTrials.gov public records Last synced Nov 15, 2026, 6:45 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 41 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: 1000 IU D3 Clear all

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: 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: Male Infertility
Interventions: Antioxidant Supplement, Placebo; Drug · Other
Lead sponsor: Yale University; Other
Eligibility: 18 Years and older · Male only
Enrollment: 171 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2015 – 2018
U.S. locations: 10
States / cities: Los Angeles, California • San Francisco, California • Sunnyvale, California + 7 more

Conditions: Endometriosis
Interventions: Vitamin D3, Fish Oil, Placebo; Dietary Supplement · Other
Lead sponsor: Boston Children's Hospital; Other
Eligibility: 12 Years to 25 Years · Female only
Enrollment: 69 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2016
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Crohns Disease, Vitamin D Deficiency
Interventions: 5000 IU D3, 1000 IU D3, Placebo; Dietary Supplement
Lead sponsor: Cedars-Sinai Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 10 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018
U.S. locations: 1
States / cities: Los Angeles, California

Conditions: Chronic Kidney Disease
Interventions: 1000 IU of Vitamin D3, 4000 IU of Vitamin D3; Drug
Lead sponsor: Emory University; Other
Eligibility: 9 Years to 21 Years
Enrollment: 98 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2014
U.S. locations: 1
States / cities: Atlanta, Georgia

Conditions: Migraine
Interventions: Simvastatin, Vitamin D, Placebo; Drug · Dietary Supplement · Other
Lead sponsor: Rami Burstein; Other
Eligibility: 18 Years and older
Enrollment: 89 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2015
U.S. locations: 1
States / cities: Boston, Massachusetts

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, Polyps, Adenomas
Interventions: Calcium Carbonate, Vitamin D3, placebo; Drug
Lead sponsor: Dartmouth-Hitchcock Medical Center; Other
Eligibility: 45 Years to 75 Years
Enrollment: 2,813 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2004 – 2016
U.S. locations: 10
States / cities: Los Angeles, California • Denver, Colorado • Atlanta, Georgia + 7 more

Conditions: Cerebral Palsy
Interventions: HMB + Vitamin D3; Dietary Supplement
Lead sponsor: Gillette Children's Specialty Healthcare; Other
Eligibility: 13 Years to 17 Years
Enrollment: 7 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2022 – 2024
U.S. locations: 1
States / cities: Saint Paul, Minnesota

Conditions: Bariatric Surgery Candidate
Interventions: Zoledronic Acid, Calcium citrate + vitamin D, Vitamin D3; Drug · Dietary Supplement
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 25 Years to 100 Years
Enrollment: 6 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018 – 2020
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Physical Function, Vitamin D Insufficiency
Interventions: calcium, Vitamin D plus calcium; Dietary Supplement
Lead sponsor: Wake Forest University Health Sciences; Other
Eligibility: 70 Years to 89 Years
Enrollment: 16 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Winston-Salem, North Carolina

Conditions: Parkinson Disease
Interventions: Vitamin D3, Placebo; Dietary Supplement · Other
Lead sponsor: Memorial Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 23 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2013
U.S. locations: 1
States / cities: Johnstown, Pennsylvania

Conditions: Obesity, Rhinitis, Rhinitis, Allergic, Respiratory Sounds, Dyspnea, Headache, Migraine Disorders, Arthritis, Arthralgia, Anxiety, Sleep Initiation and Maintenance Disorders, Sleep Deprivation
Interventions: Vitamin A, Vitamin B6, Vitamin C, Nicotinamide, Vitamin D3, Vitamin E, Broccoli, Spinach, Caffeine, Coffee, Axon Eyewear, Chocolate; Dietary Supplement · Other · Device
Lead sponsor: Verifomics LLC; Industry
Eligibility: 18 Years and older
Enrollment: 16 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2016
U.S. locations: 1
States / cities: Dallas, Texas

Conditions: HIV
Interventions: Vitamin D3, Placebo, Vitamin Supplements; Drug · Other
Lead sponsor: Columbia University; Other
Eligibility: 40 Years to 70 Years · Female only
Enrollment: 85 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2016
U.S. locations: 1
States / cities: New York, New York

Conditions: Respiratory Infection
Interventions: Vitamin D3 (cholecalciferol), Placebo Sugar Pill; Dietary Supplement
Lead sponsor: University of Iowa; Other
Eligibility: 18 Years to 60 Years
Enrollment: 98 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2007 – 2010
U.S. locations: 1
States / cities: Iowa City, Iowa

Conditions: Obesity, Vitamin D Deficiency
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of Pittsburgh; Other
Eligibility: 10 Years to 18 Years
Enrollment: 225 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2018
U.S. locations: 1
States / cities: Pittsburgh, Pennsylvania

Conditions: Vitamin D Deficiency, Falls
Interventions: 200 IU/d cholecalciferol, 1000 IU/d cholecalciferol, 2000 IU/d cholecalciferol, 4000 IU/d cholecalciferol; Dietary Supplement
Lead sponsor: Johns Hopkins University; Other
Eligibility: 70 Years and older
Enrollment: 688 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2019
U.S. locations: 2
States / cities: Baltimore, Maryland • Hagerstown, Maryland

Conditions: Thalassemia Major
Interventions: Vitamin D3, Placebo; Drug
Lead sponsor: Weill Medical College of Cornell University; Other
Eligibility: 6 Years to 60 Years
Enrollment: 40 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2014
U.S. locations: 1
States / cities: New York, New York

Conditions: Vitamin D Deficiency
Interventions: Vitamin D, Placebo, Vitamin D + L-cysteine, L-cysteine; Drug
Lead sponsor: Louisiana State University Health Sciences Center Shreveport; Other
Eligibility: 18 Years to 65 Years
Enrollment: 165 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2022
U.S. locations: 1
States / cities: Shreveport, Louisiana

Conditions: HIV-associated Co-morbidities
Interventions: conventional vitamin D treatment, tiered/titrated vitamin D dosing; Dietary Supplement · Drug
Lead sponsor: Andrea Branch; Other
Eligibility: 18 Years to 70 Years
Enrollment: 62 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: New York, New York

Conditions: Vitamin D Deficiency
Interventions: Vitamin D; Dietary Supplement
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: Female only
Enrollment: 169 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2019
U.S. locations: 2
States / cities: Madison, Wisconsin • Milwaukee, Wisconsin

Conditions: Diabetic Kidney Disease
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years and older
Enrollment: 54 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2013
U.S. locations: 1
States / cities: Charleston, South Carolina

Search by objective public record fields.

Efficacy of Vitamin D Supplementation in Bariatric Surgery Patients

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

Vitamin D3 Supplementation Pilot Study

Males, Antioxidants, and Infertility Trial

Supplementation in Adolescent Girls With Endometriosis

Maintenance Dosing of Vitamin D in Crohn's Disease

Two Vitamin D Dosing Strategies in Children With Chronic Kidney Disease

Statin/Vitamin D & Migraine Study

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

Vitamin D/Calcium Polyp Prevention Study

HMB Cerebral Palsy Pilot Study

Pilot Study for Zoledronic Acid to Prevent Bone Loss After Bariatric Surgery

Vitamin D Supplementation and Physical Function in Older Adults

The Effects of Vitamin D and Bone Loss in Parkinson's Disease

Interventional Testing of Gene-environment Interactions Via the Verifomics Mobile Application

Vitamin D HIV Study on Postmenopausal Women

Human Lung Responses to Respiratory Pathogens

Vitamin D and Vascular Health in Children

Study To Understand Fall Reduction and Vitamin D in You

The Effect of Vitamin D Supplementation on Calcium Excretion in Thalassemia: a Dose Response Study

Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans

Vitamin D Supplements for HIV-positive Patients on cART

Personalized Vitamin D Supplementation in European and African Americans

Impact of Vitamin D on Diabetic Kidney Disease in African Americans