Independent directory Public ClinicalTrials.gov records United States
Clinical Trials Finder
Objective public record navigation
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 Jul 21, 2026, 11:26 AM EDT

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

Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Condition: Vitamin A Deficiency Clear all
Completed No phase listed Observational Accepts healthy volunteers

Study to Assess the Use of a Simple Lab Test to Screen for Rickets in Children

NCT00502866
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 Jul 21, 2026, 11:26 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nutritional Outcomes After Vitamin A Supplementation in Subjects With SCD

NCT03632876
View directory record Official record
Conditions
Sickle Cell Anemia in Children, Vitamin A Deficiency in Children
Interventions
retinyl palmitate
Dietary Supplement
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
9 Years and older
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 15, 2018 · Synced Jul 21, 2026, 11:26 AM EDT
Active, not recruiting Phase 1Phase 2 Interventional

A Study to Evaluate the Safety and Tolerability of QR-1123 in Subjects With Autosomal Dominant Retinitis Pigmentosa Due to the P23H Mutation in the RHO Gene

NCT04123626
View directory record Official record
Conditions
Autosomal Dominant Retinitis Pigmentosa, Eye Diseases, Eye Diseases, Hereditary, Retinal Dystrophies, Retinal Disease, Retinitis, Vision Tunnel, Vision Disorders
Interventions
QR-1123, Sham procedure
Drug · Other
Lead sponsor
ProQR Therapeutics
Industry
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
5
States / cities
Aurora, Colorado • Gainesville, Florida • Lexington, Kentucky + 2 more
Source: ClinicalTrials.gov public record
Updated May 5, 2022 · Synced Jul 21, 2026, 11:26 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Inherited Retinal Degenerative Disease Registry

NCT02435940
View directory record Official record
Conditions
Eye Diseases Hereditary, Retinal Disease, Achromatopsia, Bardet-Biedl Syndrome, Bassen-Kornzweig Syndrome, Batten Disease, Best Disease, Choroidal Dystrophy, Choroideremia, Cone Dystrophy, Cone-Rod Dystrophy, Congenital Stationary Night Blindness, Enhanced S-Cone Syndrome, Fundus Albipunctatus, Goldmann-Favre Syndrome, Gyrate Atrophy, Juvenile Macular Degeneration, Kearns-Sayre Syndrome, Leber Congenital Amaurosis, Refsum Syndrome, Retinitis Pigmentosa, Retinitis Punctata Albescens, Retinoschisis, Rod-Cone Dystrophy, Rod Dystrophy, Rod Monochromacy, Stargardt Disease, Usher Syndrome
Interventions
Not listed
Lead sponsor
Foundation Fighting Blindness
Other
Eligibility
Not listed
Enrollment
20,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2037
U.S. locations
1
States / cities
Columbia, Maryland
Source: ClinicalTrials.gov public record
Updated May 18, 2026 · Synced Jul 21, 2026, 11:26 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Phosphate Assessment in Chronic Kidney Disease Patients Study

NCT07368946
View directory record Official record
Conditions
Chronic Kidney Disease (Stage 3-4), Chronic Kidney Disease Mineral and Bone Disorder
Interventions
Dietary Phosphorus Intake
Dietary Supplement
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jan 27, 2026 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D as a Supplement Against Falls in Elderly Study

NCT01827345
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 Jul 21, 2026, 11:26 AM EDT
Terminated Phase 3 Interventional Results available

Phase 3 Safety and Efficacy Study of CTAP101 Extended-release Capsules in Children With Secondary Hyperparathyroidism

NCT05543928
View directory record Official record
Conditions
Chronic Kidney Disease stage3, Chronic Kidney Disease stage4, Vitamin d Deficiency, Secondary Hyperparathyroidism
Interventions
CTAP101, Placebo
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
8 Years to 17 Years
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
2
States / cities
Columbus, Ohio • Greenville, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 24, 2025 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety of Burosumab Versus Oral Phosphate and Active Vitamin D Treatment in Pediatric Patients With XLH

NCT02915705
View directory record Official record
Conditions
X-Linked Hypophosphatemia
Interventions
burosumab, Oral Phosphate Supplement, active vitamin D
Biological · Drug
Lead sponsor
Kyowa Kirin, Inc.
Industry
Eligibility
1 Year to 12 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
5
States / cities
Los Angeles, California • San Francisco, California • Indianapolis, Indiana + 2 more
Source: ClinicalTrials.gov public record
Updated Aug 28, 2024 · Synced Jul 21, 2026, 11:26 AM EDT
Not listed Not applicable Interventional

The Nutritional Benefits of Metanx in Patients With Diabetic Peripheral Neuropathy (MEDIAN)

NCT01990092
View directory record Official record
Conditions
Diabetic Peripheral Neuropathy, B Vitamin Deficiency
Interventions
Metanx, Placebo
Other
Lead sponsor
Pamlab, Inc.
Industry
Eligibility
25 Years to 80 Years
Enrollment
238 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
25
States / cities
Mobile, Alabama • Phoenix, Arizona • Little Rock, Arkansas + 21 more
Source: ClinicalTrials.gov public record
Updated Jan 17, 2016 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

25-Hydroxyvitamin D Pharmacokinetic Study

NCT03401541
View directory record Official record
Conditions
Vitamin D Deficiency, Fat Malabsorption
Interventions
Calcifediol, Calciferol
Drug
Lead sponsor
Boston University
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 3, 2020 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin D Status of Pregnant Women and Their Children in Eau Claire, South Carolina

NCT00412087
View directory record Official record
Conditions
Vitamin D Deficiency, Pregnancy
Interventions
cholecalciferol (vitamin D3), cholecalciferol
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
16 Years to 45 Years · Female only
Enrollment
564 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 28, 2016 · Synced Jul 21, 2026, 11:26 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Vitamin A Liver Reserves and Serum Markers of Vitamin A in US Adults at Time of Death

NCT03305042
View directory record Official record
Conditions
Vitamin A Deficiency, Vitamin A Toxicity
Interventions
Not listed
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
21 Years and older
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 16, 2017 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Not applicable Interventional

A Study to Assess Metabolic Bone Disease of Prematurity Using an Acoustic Method

NCT04752098
View directory record Official record
Conditions
Metabolic Bone Disease, Osteopenia, Neonatal Rickets
Interventions
Vibro-acoustic analysis (VAA), based on ultrasound radiation force
Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
3 Days to 8 Months
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 26, 2025 · Synced Jul 21, 2026, 11:26 AM EDT
Withdrawn Not applicable Interventional

A Study to See if Certain Antioxidants and Vitamins Will Keep Lactate Levels Down in Patients Taking Anti-HIV Drugs

NCT00037063
View directory record Official record
Conditions
HIV Infections
Interventions
Thiamine hydrochloride, Riboflavin, Ascorbic acid, Vitamin E
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
13 Years and older
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
4
States / cities
Denver, Colorado • Cleveland, Ohio • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 3, 2015 · Synced Jul 21, 2026, 11:26 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Evaluation of a Transdermal Vitamin D3 Delivery System, D3forME

NCT02174718
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Transdermal D Patch, Oral vitamin D3, Placebo patch, Oral placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 85 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 1, 2018 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Not applicable Interventional

A Prospective Open-label Comparison of Two Vitamin D3 Repletion Strategies in Vitamin D Deficient Patients

NCT01650883
View directory record Official record
Conditions
Vitamin D 25 OH Deficiency
Interventions
Cholecalciferol, Cholecalciferol 5,000 IU
Dietary Supplement
Lead sponsor
University of South Florida
Other
Eligibility
18 Years and older
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Jul 25, 2012 · Synced Jul 21, 2026, 11:26 AM EDT
Active, not recruiting No phase listed Observational

Vitamin A Status in Patients With Vocal Fold Leukoplakia

NCT05323292
View directory record Official record
Conditions
Vitamin A, Vitamin A Deficiency, Leukoplakia, Vocal Cord Neoplasm
Interventions
Not listed
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 16, 2026 · Synced Jul 21, 2026, 11:26 AM EDT
Not yet recruiting Phase 1 Interventional

High-Dose Vitamin C in G6PDA and Pyruvate Kinase Deficiency: A Safety Study

NCT07612345
View directory record Official record
Conditions
Pyruvate Kinase Deficiency, Glucose 6 Phosphate Dehydrogenase Deficiency
Interventions
Vitamin C
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Vitamin A Equivalence of Plant Carotenoids in Children

NCT00680212
View directory record Official record
Conditions
Vitamin A Deficiency
Interventions
dietary carotenoids, spinach, rice, and synthetic beta-carotene
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
6 Years to 8 Years
Enrollment
72 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 17, 2009 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Estimating Average Vitamin A Requirements in Indonesian and American Women

NCT04123210
View directory record Official record
Conditions
Vitamin A Deficiency
Interventions
Vitamin A supplement, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
19 Years to 30 Years · Female only
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 30, 2019 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Phase 3 Interventional Results available

Prevalence of Vitamin D Deficiency in Type 1 Diabetes Mellitus and Effect of Supplementation on Insulin Requirements

NCT01029392
View directory record Official record
Conditions
Type 1 Diabetes Mellitus
Interventions
Vitamin D
Drug
Lead sponsor
Corewell Health East
Other
Eligibility
1 Year to 18 Years
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Royal Oak, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 16, 2017 · Synced Jul 21, 2026, 11:26 AM EDT
Not yet recruiting No phase listed Observational

Treatment Patterns, Biochemical Profiles and Clinical Outcomes in Adults With X-Linked Hypophosphatemia

NCT07607600
View directory record Official record
Conditions
X-linked Hypophosphatemia (XLH)
Interventions
No treatment given
Other
Lead sponsor
Novo Nordisk A/S
Industry
Eligibility
18 Years to 64 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
4
States / cities
New Haven, Connecticut • Indianapolis, Indiana • Columbus, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated May 25, 2026 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Beta-carotene Absorption and Bioconversion to Vitamin A From Biofortified Cassava Gari

NCT02210507
View directory record Official record
Conditions
Vitamin A Deficiency
Interventions
Biofortified cassava gari, White cassava gari, White cassava gari + red palm oil
Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 45 Years · Female only
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Jan 11, 2015 · Synced Jul 21, 2026, 11:26 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D Replacement on Insulin Sensitivity

NCT01268111
View directory record Official record
Conditions
Insulin Sensitivity
Interventions
Ergocalciferols, Placebo
Drug
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
18 Years to 60 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Odessa, Texas
Source: ClinicalTrials.gov public record
Updated Jun 7, 2015 · Synced Jul 21, 2026, 11:26 AM EDT