Clinical Trials Finder
Independent ClinicalTrials.gov directory
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.

Clear filters
ClinicalTrials.gov public records Last synced May 21, 2026, 8:07 PM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 1–24 of 433 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Condition: Vitamin A Clear all
Completed Phase 4 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Pneumonia, Diarrhea, Acute Upper Respiratory Tract Infections
Interventions
Zinc (12.5 mg/day), vitamin A 10,000 IU per week
Drug
Lead sponsor
Tufts University
Other
Eligibility
6 Months to 36 Months
Enrollment
2,582 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2000 – 2004
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 27, 2005 · Synced May 21, 2026, 8:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Respiratory Tract Infections, Covid19, Flu Like Illness
Interventions
Vitamin D supplementation
Dietary Supplement
Lead sponsor
The Cooper Health System
Other
Eligibility
18 Years and older
Enrollment
877 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Camden, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 7, 2023 · Synced May 21, 2026, 8:07 PM EDT
Completed Phase 4 Interventional Results available
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions
Paricalcitol, Calcitriol
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
4
States / cities
Chicago, Illinois • Evanston, Illinois • Detroit, Michigan + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 6, 2014 · Synced May 21, 2026, 8:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Drug Safety, Heart; Disease, Activity
Interventions
CARD-024, Drug Carrier
Drug · Other
Lead sponsor
Cardiavent Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Kalamazoo, Michigan
Source: ClinicalTrials.gov public record
Updated Dec 30, 2012 · Synced May 21, 2026, 8:07 PM EDT
Completed Phase 4 Interventional
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Renal Failure, Chronic Renal Insufficiency
Interventions
Hectorol (doxercalciferol capsules), 0.5mcg
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
17
States / cities
Phoenix, Arizona • Alhambra, California • Riverside, California + 14 more
Source: ClinicalTrials.gov public record
Updated May 4, 2015 · Synced May 21, 2026, 8:07 PM EDT
Terminated Early Phase 1 Interventional
View directory record Official record
Conditions
Cocaine Use Disorder
Interventions
Calcitriol, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
30 Years to 55 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 13, 2023 · Synced May 21, 2026, 8:07 PM EDT
Completed Not applicable Interventional
View directory record Official record
Conditions
Hypertension, Left Ventricular Hypertrophy
Interventions
cholecalciferol (Vitamin D), Placebo
Dietary Supplement
Lead sponsor
Wayne State University
Other
Eligibility
30 Years to 74 Years
Enrollment
354 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Dec 8, 2015 · Synced May 21, 2026, 8:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Jul 6, 2017 · Synced May 21, 2026, 8:07 PM EDT
Recruiting Early Phase 1 Interventional
View directory record Official record
Conditions
Skin Cancer, Kidney Transplant Recipients
Interventions
Vitamin A, Nicotinamide, Other: Placebo
Drug · Other
Lead sponsor
Rhode Island Hospital
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Mar 19, 2026 · Synced May 21, 2026, 8:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Healthy
Interventions
Cooper Complete One-A-Day Vitamin Supplement
Drug
Lead sponsor
The Cooper Institute
Other
Eligibility
30 Years to 70 Years
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2006
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Aug 1, 2012 · Synced May 21, 2026, 8:07 PM EDT
Completed Not applicable Interventional Results available
View directory record Official record
Conditions
Pre-diabetes
Interventions
vitamin D, placebo
Drug
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
18 Years to 90 Years
Enrollment
117 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 13, 2013 · Synced May 21, 2026, 8:07 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated May 19, 2014 · Synced May 21, 2026, 8:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers
View directory record Official record
Conditions
Rickets
Interventions
Not listed
Lead sponsor
Agency for Healthcare Research and Quality (AHRQ)
Federal
Eligibility
6 Months to 15 Months
Enrollment
246 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jan 7, 2014 · Synced May 21, 2026, 8:07 PM EDT
Completed Phase 2 Interventional Results available
View directory record Official record
Conditions
Fibrosis
Interventions
Pentoxifylline, Vitamin E
Drug
Lead sponsor
University of Iowa
Other
Eligibility
20 Years and older
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2012
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jan 28, 2013 · Synced May 21, 2026, 8:07 PM EDT
Terminated Not applicable Interventional
View directory record Official record
Conditions
Peripheral Neuropathy, Mitochondrial Trifunctional Protein Deficiency
Interventions
Vitamin E supplement
Dietary Supplement
Lead sponsor
Oregon Health and Science University
Other
Eligibility
7 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Oct 20, 2015 · Synced May 21, 2026, 8:07 PM EDT
Completed Not applicable Interventional Results available
View directory record Official record
Conditions
Pantothenate Kinase-Associated Neurodegeneration
Interventions
CoA-Z, Placebo
Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
3 Months to 89 Years
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Oct 28, 2025 · Synced May 21, 2026, 8:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers
View directory record Official record
Conditions
Anemia, Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
30 Years to 50 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Aug 24, 2014 · Synced May 21, 2026, 8:07 PM EDT
Terminated Phase 1 Interventional
View directory record Official record
Conditions
Elderly, Frail
Interventions
Vitamin D + Sham Exercise, Vitamin D Placebo + Exercise, Vitamin D Placebo + Sham Exercise, Vitamin D + Exercise
Drug · Procedure
Lead sponsor
Pfizer
Industry
Eligibility
75 Years and older
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
4
States / cities
Farmington, Connecticut • Hyattsville, Maryland • Roslindale, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 7, 2009 · Synced May 21, 2026, 8:07 PM EDT
Completed Not applicable Interventional
View directory record Official record
Conditions
Hemophilia A, Hemophilia B, Vitamin D Deficiency
Interventions
Vitamin D and calcium
Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
2 Years to 21 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 28, 2016 · Synced May 21, 2026, 8:07 PM EDT
Completed Early Phase 1 Interventional
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Sep 21, 2014 · Synced May 21, 2026, 8:07 PM EDT
Completed No phase listed Observational
View directory record Official record
Conditions
Hypovitaminosis D, Spinal Disease, Osteoporosis
Interventions
Not listed
Lead sponsor
OSF Healthcare System
Other
Eligibility
50 Years and older
Enrollment
460 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2015
U.S. locations
1
States / cities
Peoria, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 27, 2018 · Synced May 21, 2026, 8:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vitamin D Deficiency (10 ng/mL to 30 ng/mL)
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
70 Years and older
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 25, 2016 · Synced May 21, 2026, 8:07 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available
View directory record Official record
Conditions
Keloid, Hypertrophic Scar, Cicatrix, Hypertrophic
Interventions
0.5% hydrocortisone, silicone, vitamin E lotion, Onion extract gel, Cetearyl alcohol lotion
Drug
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jul 9, 2019 · Synced May 21, 2026, 8:07 PM EDT
Completed Phase 4 Interventional Results available
View directory record Official record
Conditions
Schizophrenia
Interventions
Folic Acid, B12, Placebo
Dietary Supplement · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 68 Years
Enrollment
140 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
3
States / cities
Boston, Massachusetts • Grand Rapids, Michigan • Rochester, New York
Source: ClinicalTrials.gov public record
Updated Aug 18, 2014 · Synced May 21, 2026, 8:07 PM EDT