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ClinicalTrials.gov public records Last synced May 21, 2026, 8:08 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 137 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Vitamin A Deficiency Clear all
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, 8:08 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, 8:08 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, 8:08 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, 8:08 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, 8:08 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, 8:08 PM EDT
Completed Phase 1Phase 2 Interventional
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
Cethrin
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
16 Years to 70 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
5
States / cities
Phoenix, Arizona • Cincinnati, Ohio • Philadelphia, Pennsylvania + 2 more
Source: ClinicalTrials.gov public record
Updated Apr 13, 2016 · Synced May 21, 2026, 8:08 PM EDT
Completed Not applicable Interventional
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 May 21, 2026, 8:08 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
50 Years to 69 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 12, 2013 · Synced May 21, 2026, 8:08 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Dose 1, Dose 2
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Saint Paul, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 31, 2019 · Synced May 21, 2026, 8:08 PM EDT
Terminated No phase listed Observational
View directory record Official record
Conditions
Epilepsy, Magnesium Deficiency, Vitamin D Deficiency
Interventions
No Intervention. Study is Cross Sectional in nature
Other
Lead sponsor
Drexel University
Other
Eligibility
18 Years to 70 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
2
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 28, 2021 · Synced May 21, 2026, 8:08 PM EDT
Terminated Phase 3 Interventional Results available
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 May 21, 2026, 8:08 PM EDT
Completed Phase 1 Interventional
View directory record Official record
Conditions
Morbid Obesity, Vitamin D Deficiency
Interventions
vitamin D3 (Replesta), vitamin D
Dietary Supplement
Lead sponsor
Texas Tech University
Other
Eligibility
18 Years to 60 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Jun 22, 2015 · Synced May 21, 2026, 8:08 PM EDT
Completed Phase 2 Interventional Results available
View directory record Official record
Conditions
Hypophosphatasia
Interventions
asfotase alfa
Drug
Lead sponsor
Alexion Pharmaceuticals, Inc.
Industry
Eligibility
13 Years to 65 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
2
States / cities
St Louis, Missouri • Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 12, 2019 · Synced May 21, 2026, 8:08 PM EDT
Completed No phase listed Observational Accepts healthy volunteers
View directory record Official record
Conditions
Autism, Autism Spectrum Disorder, Autistic Disorder, Pregnancy Related, Diet, Healthy, Diet; Deficiency, Folate Deficiency, Folic Acid Deficiency, Folic Acid Overdose
Interventions
Survey
Other
Lead sponsor
Walden University
Other
Eligibility
18 Years and older · Female only
Enrollment
239 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 19, 2023 · Synced May 21, 2026, 8:08 PM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers
View directory record Official record
Conditions
Chronic Hepatitis C
Interventions
Not listed
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
20 Years to 60 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2019
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Jan 9, 2019 · Synced May 21, 2026, 8:08 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers
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 May 21, 2026, 8:08 PM EDT
Completed Phase 3 Interventional Results available
View directory record Official record
Conditions
X-linked Hypophosphatemia
Interventions
burosumab, Placebo
Biological · Other
Lead sponsor
Kyowa Kirin, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
134 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
8
States / cities
Los Angeles, California • San Francisco, California • New Haven, Connecticut + 5 more
Source: ClinicalTrials.gov public record
Updated Jun 17, 2024 · Synced May 21, 2026, 8:08 PM EDT
Completed No phase listed Observational
View directory record Official record
Conditions
Intestinal Failure-associated Liver Disease
Interventions
Not listed
Lead sponsor
Protara Therapeutics
Industry
Eligibility
12 Years to 80 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
10
States / cities
Los Angeles, California • Kissimmee, Florida • Chicago, Illinois + 7 more
Source: ClinicalTrials.gov public record
Updated Oct 2, 2023 · Synced May 21, 2026, 8:08 PM EDT
Completed Phase 2Phase 3 Interventional
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
AquaVanta Chewable Tablet, Flinstones Complete, Nature Made Calcium Softgels, Twin Labs Iron Caps, Rexall Vitamin B12 Tablet
Dietary Supplement
Lead sponsor
Yasoo Health
Industry
Eligibility
18 Years to 65 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 21, 2015 · Synced May 21, 2026, 8:08 PM EDT
Terminated Phase 2 Interventional Results available
View directory record Official record
Conditions
Retinitis Pigmentosa, Usher Syndrome Type 2
Interventions
RNA antisense oligonucleotide for intravitreal injection
Drug
Lead sponsor
Laboratoires Thea
Industry
Eligibility
12 Years and older
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
4
States / cities
Boston, Massachusetts • Ann Arbor, Michigan • Portland, Oregon + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 6, 2024 · Synced May 21, 2026, 8:08 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers
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 May 21, 2026, 8:08 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Mushroom Vitamin D2, Cholecalciferol, Vitamin D2 - Ergocalciferol, Mushroom Extract
Dietary Supplement
Lead sponsor
Boston University
Other
Eligibility
18 Years to 64 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 26, 2017 · Synced May 21, 2026, 8:08 PM EDT
Completed Phase 3 Interventional Results available
View directory record Official record
Conditions
Chronic Kidney Disease, Hyperparathyroidism, Secondary, Vitamin D Deficiency
Interventions
CTAP101 30 μg capsules, Sugar pill to CTAP101 30 μg capsules
Drug · Other
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years and older
Enrollment
216 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Bannockburn, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 12, 2025 · Synced May 21, 2026, 8:08 PM EDT