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ClinicalTrials.gov public records Last synced Nov 15, 2026, 1:03 PM EST

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Showing 1–24 of 84 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: 400 IU vitamin D3 Clear all

Conditions: Vitamin D Deficiency
Interventions: 400 IU Vitamin D3 (cholecalciferol), 2400 IU Vitamin D3 (cholecalciferol), 6400 IU Vitamin D3 (cholecalciferol); Drug
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years to 45 Years · Female only
Enrollment: 460 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2006 – 2012
U.S. locations: 2
States / cities: Rochester, New York • Charleston, South Carolina

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: 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: Vitamin D Deficiency
Interventions: Placebo, 800 IU/day vitamin D supplementation with feedings in the first 28 days after birth, Usual Care; Dietary Supplement · Other
Lead sponsor: The University of Texas Health Science Center, Houston; Other
Eligibility: 24 Hours to 96 Hours
Enrollment: 180 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2022 – 2027
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Premature Infants
Interventions: cholecalciferal, cholecalciferol; Dietary Supplement
Lead sponsor: University of Nebraska; Other
Eligibility: 23 Weeks to 32 Weeks
Enrollment: 32 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2013
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Anemia of Chronic Kidney Disease
Interventions: Cholecalciferol; Drug
Lead sponsor: Johns Hopkins University; Other
Eligibility: 1 Year to 21 Years
Enrollment: 34 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2015
U.S. locations: 1
States / cities: Baltimore, Maryland

Conditions: Primary Hyperparathyroidism, Vitamin D Deficiency
Interventions: 10,000 IU Vitamin D3, Placebo, Vitamin D; Drug · Other · Dietary Supplement
Lead sponsor: Columbia University; Other
Eligibility: 18 Years and older
Enrollment: 9 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2017
U.S. locations: 1
States / cities: New York, New York

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: Vitamin D Deficiency
Interventions: 1,000 IU vitamin D2, placebo capsule, mushrooms, UVB-treated mushrooms, 400 IU vitamin D2, UVB-treated mushrooms, 1,000 IU vitamin D2; Dietary Supplement · Other
Lead sponsor: USDA, Western Human Nutrition Research Center; Federal
Eligibility: 20 Years to 59 Years
Enrollment: 48 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Davis, California

Conditions: Wheezing, Allergy
Interventions: Cholecalciferol, Cholecalciferol; Dietary Supplement · Drug
Lead sponsor: Case Western Reserve University; Other
Eligibility: Up to 1 Year
Enrollment: 300 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2017
U.S. locations: 5
States / cities: New York, New York • Cleveland, Ohio • Charleston, South Carolina

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: Colorectal Adenomatous Polyps
Interventions: Calcium and vitamin D3 combined, Placebo, Calcium, Vitamin D3; Dietary Supplement · Drug
Lead sponsor: Emory University; Other
Eligibility: 30 Years to 74 Years
Enrollment: 92 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2005 – 2013
U.S. locations: 1
States / cities: Atlanta, Georgia

Conditions: SARS-CoV-2 Infection
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of Chicago; Other
Eligibility: 18 Years and older
Enrollment: 1,475 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2024
U.S. locations: 2
States / cities: Chicago, Illinois

Conditions: Healthy, no Evidence of Disease
Interventions: cholecalciferol, questionnaire administration, trivalent influenza vaccine; Dietary Supplement · Other · Biological
Lead sponsor: Roswell Park Cancer Institute; Other
Eligibility: 18 Years to 64 Years
Enrollment: 11 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Buffalo, New York

Conditions: Breast Neoplasms
Interventions: Exemestane, Calcium carbonate, Vitamin D; Drug · Dietary Supplement
Lead sponsor: Georgetown University; Other
Eligibility: Female only
Enrollment: 46 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2011
U.S. locations: 2
States / cities: Washington D.C., District of Columbia • Bethesda, Maryland

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: Peyronie's Disease
Interventions: Vitamin D2, Vitamin E, Testosterone Pellets; Drug
Lead sponsor: Men's Health Boston; Other
Eligibility: 18 Years to 70 Years · Male only
Enrollment: 75 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2017
U.S. locations: 1
States / cities: Chestnut Hill, Massachusetts

Conditions: Post-Menopausal Osteoporosis
Interventions: ibandronate [Bonviva/Boniva]; Drug
Lead sponsor: Hoffmann-La Roche; Industry
Eligibility: Female only
Enrollment: 781 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2004 – 2008
U.S. locations: 6
States / cities: Gainesville, Georgia • St Louis, Missouri • Omaha, Nebraska + 3 more

Conditions: Vitamin D Deficiency
Interventions: cholecalciferol (vitamin D3), cholecalciferol; Drug
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 16 Years to 45 Years · Female only
Enrollment: 501 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2004 – 2010
U.S. locations: 1
States / cities: Charleston, South Carolina

Conditions: Breast Neoplasms
Interventions: Vitamin D, Calcium carbonate, Vitamin D, Placebo; Dietary Supplement · Drug · Other
Lead sponsor: Washington University School of Medicine; Other
Eligibility: 18 Years and older · Female only
Enrollment: 63 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2005 – 2009
U.S. locations: 1
States / cities: St Louis, Missouri

Conditions: Food Allergy
Interventions: Food Supplement; Dietary Supplement
Lead sponsor: Northwestern University; Other
Eligibility: 5 Months to 11 Months
Enrollment: 705 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2017
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: Vitamin D Deficiency
Interventions: Vitamin D drops, 200 or 400 or 600 IU/day or 800 IU/day; Dietary Supplement
Lead sponsor: Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD); NIH
Eligibility: 3 Weeks to 5 Weeks
Enrollment: 398 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2006 – 2011
U.S. locations: 1
States / cities: Coralville, Iowa

Conditions: Obesity
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Mayo Clinic; Other
Eligibility: 12 Years to 18 Years
Enrollment: 51 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Rochester, Minnesota

Conditions: Atopic Dermatitis, Vitamin D Deficiency
Interventions: Vitamin D; Drug
Lead sponsor: Medical College of Wisconsin; Other
Eligibility: 1 Year to 18 Years
Enrollment: 7 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2013
U.S. locations: 1
States / cities: Milwaukee, Wisconsin

Search by objective public record fields.

Establishing the Vitamin D Requirements During Lactation

Vitamin D Supplementation in Older Women

Males, Antioxidants, and Infertility Trial

ViDES Trial (Vitamin D Extra Supplementation)

Serum 25-hydroxy Vitamin D [25(OH)D] Levels, Supplemental Vitamin D, and Parathyroid Hormone Levels in Premature Infants

Vitamin D as a Modifier of Serum Hepcidin in Children With Chronic Kidney Disease

Vitamin D Repletion in Primary Hyperparathyroidism

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

Effect of Consumption of Post-harvest UV-B Treated Mushrooms on Vitamin D Status of Healthy Adults

Wheezing in Black Preterm Infants: Impact of Vitamin D Supplementation Strategy

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

Calcium and Vitamin D vs Markers of Adenomatous Polyps

Low vs. Moderate to High Dose Vitamin D for Prevention of COVID-19

Cholecalciferol and Flu Vaccine in Treating Healthy Participants

Exemestane and Celecoxib in Postmenopausal Women at High Risk for Breast Cancer

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

Testosterone Pellets Plus Vitamin D and E Versus Vitamin D and E Alone for the Treatment of Peyronie's Disease

A Study of Bonviva (Ibandronate) in Women With Post-Menopausal Osteoporosis Who Have Received Previous Bonviva Treatment

Evaluation of Vitamin D Requirements During Pregnancy

High Dose Vit D Musculoskeletal Symptoms & Bone Density in Anastrozole-Treated Breast Cancer With Marginal Vit D Status

Introduction and Maintenance of Still Eating Protein Blends in Support of Infant Nutritional Goals

Prevention of Vitamin D Deficiency

Effect of Vitamin D3 Supplementation on Insulin Resistance and Cardiovascular Risk Factors in Obese Adolescents

Vitamin D Deficiency and Atopic Dermatitis