- Conditions
- Prematurity; Extreme
- Interventions
- Vitamin D supplementation, No additional vitamin D supplementation
- Dietary Supplement · Other
- Lead sponsor
- University of Alabama at Birmingham
- Other
- Eligibility
- 1 Day to 4 Days
- Enrollment
- 126 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2023 – 2027
- U.S. locations
- 1
- States / cities
- Birmingham, Alabama
Search Results
Search by objective public record fields.
Search by query text, NCT ID, condition, intervention, sponsor, city, state, recruitment status, phase, study type, healthy volunteer eligibility, sex, or age. Results are retrieved from ClinicalTrials.gov and synchronized into the directory. Search pages remain noindex by default.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Showing 1–22
of 22
matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
- Conditions
- Frailty, Weakness, Muscle, Multiple Chronic Conditions
- Interventions
- Beta-hydroxymethyl butyrate supplement, Vitamin D supplement, Matching Beta-hydroxymethyl butyrate supplement without Vitamin D
- Dietary Supplement
- Lead sponsor
- University of North Carolina, Chapel Hill
- Other
- Eligibility
- 65 Years to 85 Years
- Enrollment
- 25 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2023 – 2026
- U.S. locations
- 1
- States / cities
- Chapel Hill, North Carolina
- Conditions
- Vitamin D Deficiency, Hypovitaminosis A, Vitamin E Deficiency
- Interventions
- Vitamin D, Vitamin D, Vitamin E, and Vitamin A, Control, 700 mg Calcium
- Dietary Supplement
- Lead sponsor
- Boston University
- Other
- Eligibility
- 6 Years to 10 Years
- Enrollment
- 180 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2005 – 2008
- 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
- Vitamin D Deficiency, Preterm Infants, Bronchopulmonary Dysplasia
- Interventions
- Cholecalciferol, Placebo
- Dietary Supplement
- Lead sponsor
- University of Alabama at Birmingham
- Other
- Eligibility
- 1 Minute to 7 Days
- Enrollment
- 100 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2012 – 2016
- U.S. locations
- 1
- States / cities
- Birmingham, Alabama
- Conditions
- Seasonal Allergic Rhinitis
- Interventions
- Vitamin D3, Placebo, Fluticasone Propionate
- Drug
- Lead sponsor
- University of Chicago
- Other
- Eligibility
- 18 Years to 45 Years
- Enrollment
- 35 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2010 – 2011
- U.S. locations
- 1
- States / cities
- Chicago, Illinois
- Conditions
- Vitamin D Supplementation
- Interventions
- Supplemental Vitamin D
- Drug
- Lead sponsor
- Boston Children's Hospital
- Other
- Eligibility
- 11 Years to 18 Years
- Enrollment
- 56 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2008 – 2011
- U.S. locations
- 1
- States / cities
- Boston, Massachusetts
- 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
- HIV-1 Infection
- Interventions
- EFV/FTC/TDF, Calcium Carbonate, Vitamin D3, Placebo for calcium carbonate, Placebo for vitamin D3
- Drug
- Lead sponsor
- Advancing Clinical Therapeutics Globally for HIV/AIDS and Other Infections
- Network
- Eligibility
- 18 Years and older
- Enrollment
- 167 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2011 – 2013
- U.S. locations
- 38
- States / cities
- Birmingham, Alabama • Los Angeles, California • Palo Alto, California + 27 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
- 60 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2023 – 2029
- U.S. locations
- 1
- States / cities
- Galveston, Texas
- Conditions
- Male Osteoporosis
- Interventions
- Teriparatide or human parathyroid hormone (PTH) 1-34, Cinacalcet, placebo tablet, Calcium citrate tablet, Vitamin D3
- Drug · Dietary Supplement
- Lead sponsor
- VA Office of Research and Development
- Federal
- Eligibility
- 60 Years to 85 Years · Male only
- Enrollment
- 40 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2019 – 2025
- U.S. locations
- 1
- States / cities
- San Francisco, California
- 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
- Post Menopausal Osteoporosis
- Interventions
- Placebo, Vitamin D and calcium supplementation, ibandronate [Bonviva/Boniva]
- Drug
- Lead sponsor
- Hoffmann-La Roche
- Industry
- Eligibility
- 65 Years and older · Female only
- Enrollment
- 67 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2006 – 2007
- U.S. locations
- 7
- States / cities
- Beverly Hills, California • La Jolla, California • Augusta, Georgia + 4 more
- 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
- 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
- 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
- Vitamin D Deficiency, HIV
- Interventions
- Vitamin D
- Dietary Supplement
- Lead sponsor
- University of California, Los Angeles
- Other
- Eligibility
- 18 Years to 90 Years
- Enrollment
- 122 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2010 – 2012
- U.S. locations
- 1
- States / cities
- Los Angeles, California
- 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
- Inflammation, Infection
- Interventions
- Vitamin D3 Supplementation
- Dietary Supplement
- Lead sponsor
- Cornell University
- Other
- Eligibility
- 13 Years to 18 Years · Female only
- Enrollment
- 85 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2012 – 2019
- U.S. locations
- 1
- States / cities
- Rochester, New York
- Conditions
- Type 2 Diabetes Mellitus (T2DM), Sarcopenia, Obesity, Muscle Loss, Older Adults
- Interventions
- Calcium-HMB Plus Vitamin D3, Matching placebo
- Dietary Supplement · Other
- Lead sponsor
- Vanderbilt University Medical Center
- Other
- Eligibility
- 65 Years to 85 Years
- Enrollment
- 90 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2026 – 2030
- U.S. locations
- 1
- States / cities
- Nashville, Tennessee
- 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
- 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