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ClinicalTrials.gov public records Last synced May 21, 2026, 10:12 PM 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.
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Filters: Condition: Vitamin A Clear all
Withdrawn Phase 1 Interventional
View directory record Official record
Conditions
Hyperlipidemia
Interventions
Vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
18 Years to 88 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Apr 21, 2015 · Synced May 21, 2026, 10:12 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, 10:12 PM EDT
Suspended Phase 3 Interventional
View directory record Official record
Conditions
Shock, Thermal Burn
Interventions
Ascorbic Acid, placebo
Drug
Lead sponsor
Clinical Evaluation Research Unit at Kingston General Hospital
Other
Eligibility
18 Years and older
Enrollment
666 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
10
States / cities
Phoenix, Arizona • Bridgeport, Connecticut • Washington D.C., District of Columbia + 7 more
Source: ClinicalTrials.gov public record
Updated Apr 5, 2026 · Synced May 21, 2026, 10:12 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, 10:12 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, 10:12 PM EDT
Terminated Phase 2 Interventional
View directory record Official record
Conditions
Neurofibromatosis Type 1 (NF1)
Interventions
Cholecalciferol
Drug
Lead sponsor
University of Utah
Other
Eligibility
25 Years to 40 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
2
States / cities
Cincinnati, Ohio • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 24, 2022 · Synced May 21, 2026, 10:12 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, 10:12 PM EDT
Completed Not applicable Interventional
View directory record Official record
Conditions
Hematopoietic Stem Cell Transplant
Interventions
Vitamin A
Dietary Supplement
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
1 Year and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated May 29, 2018 · Synced May 21, 2026, 10:12 PM EDT
Completed Phase 3 Interventional
View directory record Official record
Conditions
Alzheimer Disease
Interventions
Donepezil, Vitamin E
Drug
Lead sponsor
National Institute on Aging (NIA)
NIH
Eligibility
55 Years to 90 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2004
U.S. locations
63
States / cities
Phoenix, Arizona • Tucson, Arizona • Irvine, California + 53 more
Source: ClinicalTrials.gov public record
Updated Dec 10, 2009 · Synced May 21, 2026, 10:12 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, 10:12 PM EDT
Completed Not applicable Interventional
View directory record Official record
Conditions
Hot Flashes, Prostate Carcinoma
Interventions
Vitamin B6, Questionnaire Administration
Dietary Supplement · Other
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Thomas Jefferson University
Other
Eligibility
Male only
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 14, 2025 · Synced May 21, 2026, 10:12 PM EDT
Recruiting Phase 2 Interventional
View directory record Official record
Conditions
Myelodysplastic Syndromes
Interventions
High-dose ascorbate, Azacitidine
Drug
Lead sponsor
Prajwal Dhakal
Other
Eligibility
18 Years to 99 Years
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Mar 15, 2026 · Synced May 21, 2026, 10:12 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, 10:12 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, 10:12 PM EDT
Terminated No phase listed Observational
View directory record Official record
Conditions
Non-Small Cell Lung Cancer
Interventions
Not listed
Lead sponsor
University of Michigan Rogel Cancer Center
Other
Eligibility
18 Years to 80 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
2
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 30, 2014 · Synced May 21, 2026, 10:12 PM EDT
Terminated Phase 3 Interventional Results available
View directory record Official record
Conditions
Prostate Cancer
Interventions
Vitamin E
Drug
Lead sponsor
New Mexico Cancer Research Alliance
Other
Eligibility
18 Years and older · Male only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Jul 15, 2015 · Synced May 21, 2026, 10:12 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers
View directory record Official record
Conditions
COVID-19, Coronavirus Infection, Sars-CoV2, Corona Virus Infection, COVID, Coronavirus, Coronavirus-19, Coronavirus 19
Interventions
Hydroxychloroquine, Vitamin C, Vitamin D, Zinc
Drug · Dietary Supplement
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
254 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Jun 4, 2025 · Synced May 21, 2026, 10:12 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, 10:12 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, 10:12 PM EDT
Completed Phase 3 Interventional Results available
View directory record Official record
Conditions
Atrial Fibrillation
Interventions
Apixaban, Acetylsalicylic acid
Drug
Lead sponsor
Bristol-Myers Squibb
Industry
Eligibility
50 Years and older
Enrollment
6,421 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2017
U.S. locations
69
States / cities
Mobile, Alabama • Tucson, Arizona • Anaheim, California + 62 more
Source: ClinicalTrials.gov public record
Updated Jun 14, 2018 · Synced May 21, 2026, 10:12 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, 10:12 PM EDT
Withdrawn Phase 2Phase 3 Interventional
View directory record Official record
Conditions
Hepatitis C
Interventions
Telaprevir, Peginterferon alfa-2a, Ribavirin, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Timothy Morgan, MD
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2013
U.S. locations
4
States / cities
Long Beach, California • Minneapolis, Minnesota • Kansas City, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated May 13, 2014 · Synced May 21, 2026, 10:12 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, 10:12 PM EDT
Completed Phase 1 Interventional
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions
CTAP101 Capsules, CTAP101 Injection
Drug
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
12
States / cities
Peoria, Arizona • Evergreen Park, Illinois • Springfield, Massachusetts + 9 more
Source: ClinicalTrials.gov public record
Updated Sep 29, 2014 · Synced May 21, 2026, 10:12 PM EDT