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ClinicalTrials.gov public records Last synced Oct 13, 2026, 5:54 PM EDT

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Showing 217–240 of 368 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic acid (Vitamin C) Clear all
Terminated Phase 1 Interventional Results available

High Dose Vitamin C in Cardiac Surgery Patients

NCT02762331
View directory record Official record
Conditions
Disorder of Vitamin C, Atrial Fibrillation, Complications Due to Coronary Artery Bypass Graft, Heart Valve Disease
Interventions
Ascorbic Acid, Placebo
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 70 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jun 24, 2019 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Hydrolyzed Collagen and Vitamin C on Explosive Performance

NCT04437758
View directory record Official record
Conditions
Collagen Synthesis, Rate of Force (RFD) Development
Interventions
Collagen and Vitamin C powder mix nutritional intervention, Maltodextrin placebo powder, Maximum power training exercise
Dietary Supplement · Other
Lead sponsor
PepsiCo Global R&D
Industry
Eligibility
18 Years to 30 Years · Male only
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Jun 18, 2020 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Phase 3 Interventional

Trial of Vitamins in HIV Progression and Transmission

NCT00197743
View directory record Official record
Conditions
HIV Infections, Disease Transmission, Vertical
Interventions
Vitamin A + Beta Carotene, Multivitamins, Placebo
Dietary Supplement · Other
Lead sponsor
Harvard School of Public Health (HSPH)
Other
Eligibility
18 Years and older · Female only
Enrollment
1,085 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1995 – 2003
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 11, 2010 · Synced Oct 13, 2026, 5:54 PM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

Impact of NOS, COX, and ROS Inhibition on Cerebral Blood Flow Regulation

NCT03066115
View directory record Official record
Conditions
Hypoxia, Hypercapnia
Interventions
L-NMMA, Ketorolac, Ascorbic Acid, Intravenous Catheter, Transcranial Doppler Ultrasound
Drug · Procedure
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 45 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jan 10, 2019 · Synced Oct 13, 2026, 5:54 PM 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 4, 2015 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Vitamin C on Iron Absorption

NCT00570895
View directory record Official record
Conditions
Iron Deficiency
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
4 Years to 8 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 26, 2020 · Synced Oct 13, 2026, 5:54 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

: Vascular Function in Health and Disease

NCT02966665
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease, Pulmonary Artery Hypertension, Heart Failure, Hypertension
Interventions
Maximum Exercise Tests, BH4, L-NMMA, Vitamin C, Vitamin E, α-Lipoic Acid and L-Ascorbate, BQ-123, Fexofenadine, Ranitidine, Angiotensin-II, Valsartan, Acetylcholine, Sodium Nitroprusside, Angiotensin-II, Norepinephrine, Phentolamine, BQ-123, MitoQ, BH4
Other · Drug
Lead sponsor
D. Walter Wray
Other
Eligibility
18 Years and older
Enrollment
420 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2030
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Sep 25, 2026 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Study Evaluating the Efficacy of an Ibuprofen Effervescent Tablet in the Treatment of Post-Surgical Dental Pain

NCT00631111
View directory record Official record
Conditions
Pain
Interventions
effervescent ibuprofen tablets, effervescent Aspirin plus Vitamin C tablets, ibuprofen tablets, placebo
Drug
Lead sponsor
Wyeth is now a wholly owned subsidiary of Pfizer
Industry
Eligibility
16 Years to 40 Years
Enrollment
270 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Aug 10, 2009 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Phase 1 Interventional

Vitamin C in Cardiac Surgery Patients

NCT03123107
View directory record Official record
Conditions
Coronary Artery Bypass Graft Surgery
Interventions
Ascorbic Acid
Drug
Lead sponsor
Geisinger Clinic
Other
Eligibility
21 Years to 79 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Wilkes-Barre, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 16, 2021 · Synced Oct 13, 2026, 5:54 PM EDT
Not listed Early Phase 1 Interventional Accepts healthy volunteers

Topical Ascorbic Acid for Treatment of Squamous Cell Skin Cancer

NCT05932511
View directory record Official record
Conditions
Squamous Cell Cancer, Squamous Cell Carcinoma, Skin Cancer, Non-melanoma Skin Cancer
Interventions
30% ascorbic acid in DMSO
Drug
Lead sponsor
Center for Biomedical Research, Inc.
Industry
Eligibility
18 Years to 85 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Boise, Idaho
Source: ClinicalTrials.gov public record
Updated Aug 30, 2023 · Synced Oct 13, 2026, 5:54 PM EDT
Withdrawn Phase 1 Interventional

An Investigator-initiated Study to Evaluate Safety and Efficacy of ARINA-1 in People With a Tracheostomy

NCT05658029
View directory record Official record
Conditions
Tracheostomy
Interventions
ARINA-1
Drug
Lead sponsor
Matthew Bruehl
Other
Eligibility
18 Years to 75 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
1
States / cities
Raleigh, North Carolina
Source: ClinicalTrials.gov public record
Updated May 14, 2024 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Not applicable Interventional

Mitochondrial Cocktail for Gulf War Illness

NCT02804828
View directory record Official record
Conditions
Gulf War Syndrome, Persian Gulf Syndrome, Mitochondrial Disorders
Interventions
Individualized mitochondrial cocktail, Placebo
Dietary Supplement
Lead sponsor
University of California, San Diego
Other
Eligibility
48 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Apr 5, 2023 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Phase 2 Interventional Results available

Reducing Frailty for Older Cancer Survivors Using Supplements

NCT04553666
View directory record Official record
Conditions
Frailty, Inflammation
Interventions
Epigallocatechin-3-Gallate (EGCG) plus Ascorbic Acid (Vitamin C)
Drug
Lead sponsor
University of Rochester
Other
Eligibility
65 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Phase 3 Interventional Results available

Vitamin C, Thiamine, and Steroids in Sepsis

NCT03509350
View directory record Official record
Conditions
Sepsis
Interventions
Vitamin C, Thiamine, Hydrocortisone, Vitamin C Placebo, Thiamine Placebo, Hydrocortisone Placebo
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
501 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
43
States / cities
Phoenix, Arizona • Tucson, Arizona • Los Angeles, California + 30 more
Source: ClinicalTrials.gov public record
Updated Apr 13, 2021 · Synced Oct 13, 2026, 5:54 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Effect of Age and Fitness on Vascular Function and Oxidative Stress During Acute Inflammation

NCT03889158
View directory record Official record
Conditions
Aging, Inflammation
Interventions
Typhoid Vaccine, Ascorbic Acid
Biological · Dietary Supplement
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years to 75 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 12, 2021 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Not applicable Interventional

Treating Oxidative Stress and the Metabolic Pathology of Autism

NCT00572741
View directory record Official record
Conditions
Autistic Disorder
Interventions
B12, Placebo, folate, B complex, vitamin C, cod liver oil, Mineral complex, carnitine
Dietary Supplement
Lead sponsor
Arkansas Children's Hospital Research Institute
Other
Eligibility
3 Years to 7 Years
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2016
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated May 5, 2016 · Synced Oct 13, 2026, 5:54 PM EDT
Withdrawn Phase 3 Interventional

Vitamin C and Atrial Fibrillation After Cardiac Surgery

NCT01580683
View directory record Official record
Conditions
Atrial Fibrillation
Interventions
Ascorbic Acid, Identical Placebo
Drug · Other
Lead sponsor
Regional Hospital of Scranton
Other
Eligibility
50 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Scranton, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 13, 2015 · Synced Oct 13, 2026, 5:54 PM EDT
Recruiting Phase 1 Interventional

High Dose Ascorbic Acid (HDAA) in Patients With Plasma Cell Disorders

NCT06313502
View directory record Official record
Conditions
Plasma Cell Disorder
Interventions
75gm HDAA, 100gm HDAA, 125gm HDAA
Drug
Lead sponsor
University of Arkansas
Other
Eligibility
18 Years to 100 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Jun 4, 2026 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Melatonin and Vitamin C on COVID-19

NCT04530539
View directory record Official record
Conditions
Covid19, SARS-CoV Infection
Interventions
Vitamin C, melatonin, Placebo, Symptom Survey
Dietary Supplement · Other
Lead sponsor
Lancaster General Hospital
Other
Eligibility
50 Years and older
Enrollment
122 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Lancaster, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 17, 2022 · Synced Oct 13, 2026, 5:54 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Nitric Oxide Bioavailability and Early Life Stress (NO-Stress)

NCT02115724
View directory record Official record
Conditions
Cardiovascular Disease
Interventions
Antioxidant cocktail, Biopsy, Placebo, NMD; 0.4mg sub-lingual nitroglycerin spray
Dietary Supplement · Other · Drug
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 40 Years
Enrollment
74 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2027
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 28, 2025 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Phase 2Phase 3 Interventional

High Dose Ascorbic Acid Treatment of CMT1A

NCT00484510
View directory record Official record
Conditions
Charcot-Marie-Tooth Disease, Type Ia
Interventions
Ascorbic acid (Vitamin C), placebo
Drug
Lead sponsor
Wayne State University
Other
Eligibility
13 Years to 70 Years
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
3
States / cities
Baltimore, Maryland • Detroit, Michigan • Rochester, New York
Source: ClinicalTrials.gov public record
Updated Mar 6, 2013 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Phase 2 Interventional Results available

Cephalon Decitabine, Arsenic Trioxide and Ascorbic Acid for Myelodysplastic Syndrome

NCT00621023
View directory record Official record
Conditions
Myelodysplastic Syndrome
Interventions
Decitabine, Arsenic Trioxide and Ascorbic Acid
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 4, 2013 · Synced Oct 13, 2026, 5:54 PM EDT
Completed Phase 2 Interventional

Antioxidant Therapy in Lean and Obese Asthmatics

NCT01317563
View directory record Official record
Conditions
Asthma
Interventions
Vitamins A, E, C & Selenium, Placebo
Dietary Supplement
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
12 Years to 25 Years
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2016
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 22, 2016 · Synced Oct 13, 2026, 5:54 PM EDT
Withdrawn Not applicable Interventional

Vitamin C & Exercise Induced Bronchoconstriction (EIB)

NCT03610932
View directory record Official record
Conditions
Exercise-induced Bronchospasm
Interventions
Vitamin C, Placebo
Dietary Supplement · Other
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Dec 13, 2019 · Synced Oct 13, 2026, 5:54 PM EDT