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ClinicalTrials.gov public records Last synced Sep 30, 2026, 5:42 PM EDT

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Showing 1–24 of 367 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic acid (vitamin C) Clear all
Withdrawn Not applicable Interventional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 Sep 30, 2026, 5:42 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Trial Assessing the Impact on Facial Skin Quality, Hydration, and Skin Barrier of Three (3) Hydrafacial Treatments in Adults of All Skin Types.

NCT05932732
View directory record Official record
Conditions
Cutis Laxa Facialis, Xeroderma
Interventions
HydraFacial Syndeo System, ReGen-GF, HydraFacial Elite MD System
Device · Drug
Lead sponsor
Austin Institute for Clinical Research
Network
Eligibility
30 Years to 55 Years
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
2
States / cities
Houston, Texas • Pflugerville, Texas
Source: ClinicalTrials.gov public record
Updated Oct 24, 2024 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Nitric Oxide Bioavailability in Chronic Obstructive Pulmonary Disease (COPD)

NCT01398943
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive
Interventions
Tetrahydrobiopterin (BH4), Antioxidant Cocktail
Drug · Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Dec 11, 2017 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Obesity, Inflammation and Oxidative Stress

NCT01028976
View directory record Official record
Conditions
C-reactive Protein, Inflammation, Obesity, Oxidative Stress
Interventions
Vitamin C (ascorbic acid), Placebo tablet
Dietary Supplement
Lead sponsor
University of California, Berkeley
Other
Eligibility
18 Years and older
Enrollment
512 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Dec 2, 2015 · Synced Sep 30, 2026, 5:42 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Evaluating the Effects of a Synbiotic Versus Probiotic or Placebo on Gut Microbiota and Cardiometabolic Health: A Randomized Double-Blind Placebo Controlled Trial

NCT06544915
View directory record Official record
Conditions
Blood Pressure, Body Composition, Immune Function
Interventions
Synbiotic, Probiotic, Placebo
Dietary Supplement
Lead sponsor
Skidmore College
Other
Eligibility
18 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Saratoga Springs, New York
Source: ClinicalTrials.gov public record
Updated Aug 9, 2024 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Not applicable Interventional

A Single Group Study to Evaluate the Effects of a Probiotic Vaginal Suppository on Vaginal Health.

NCT06565312
View directory record Official record
Conditions
Vaginal Health, Vaginal pH
Interventions
Flora Power Probiotic Vaginal Suppository
Dietary Supplement
Lead sponsor
Love Wellness
Industry
Eligibility
18 Years and older · Female only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Aug 21, 2024 · Synced Sep 30, 2026, 5:42 PM EDT
Withdrawn Phase 2 Interventional

Melphalan, Arsenic Trioxide, and Ascorbic Acid in Treating Patients With Relapsed or Refractory Multiple Myeloma

NCT00085345
View directory record Official record
Conditions
Stage II Multiple Myeloma, Stage III Multiple Myeloma, Refractory Plasma Cell Neoplasm
Interventions
arsenic trioxide, ascorbic acid, melphalan, chemosensitization/potentiation, chemotherapy
Drug · Procedure
Lead sponsor
Oncotherapeutics
Industry
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
19
States / cities
Glendale, Arizona • Bakersfield, California • Campbell, California + 16 more
Source: ClinicalTrials.gov public record
Updated Jul 10, 2013 · Synced Sep 30, 2026, 5:42 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Examining the Impact of Exercise Training on Vascular Dysfunction in Individuals With Mental Health Disorders - Study 1

NCT04916327
View directory record Official record
Conditions
Peripheral Vascular Diseases
Interventions
Antioxidant, Placebo
Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 35 Years
Enrollment
720 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2027
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Sep 23, 2026 · Synced Sep 30, 2026, 5:42 PM EDT
Approved For Marketing No phase listed Expanded access

Treatment on HBeAg Positive or HBeAg Negative in Chronic Hepatitis B

NCT01198860
View directory record Official record
Conditions
CHRONIC HEPATITIS B
Interventions
CTH Chronic Hepatitis B
Drug
Lead sponsor
Nguyen Thi Trieu, MD
Individual
Eligibility
18 Years to 60 Years
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
Wilmington, Delaware
Source: ClinicalTrials.gov public record
Updated Dec 15, 2025 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin C to Reduce Morning Cardiovascular Risk

NCT03290612
View directory record Official record
Conditions
Cardiovascular Risk Factor
Interventions
Vitamin C, Placebo
Dietary Supplement · Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
40 Years to 60 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2022
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Mar 23, 2023 · Synced Sep 30, 2026, 5:42 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 Sep 30, 2026, 5:42 PM EDT
Active, not recruiting Not applicable Interventional

Functional Snack Foods With Safflower Oil and Soy in Postmenopausal Women Having Metabolic Syndrome

NCT02199054
View directory record Official record
Conditions
Metabolic Syndrome, Overweight
Interventions
wheat-safflower oil pretzels, soy-safflower oil pretzels, control wheat pretzels
Other
Lead sponsor
Ohio State University
Other
Eligibility
45 Years to 70 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2027
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 20, 2026 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Respiratory and Autonomic Plasticity Following Intermittent Hypoxia

NCT00860743
View directory record Official record
Conditions
Sleep Apnea Syndromes
Interventions
Antioxidant cocktail
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
20 Years to 40 Years
Enrollment
63 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2013
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Nov 1, 2017 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Hydroxychloroquine for COVID-19 Post-exposure Prophylaxis (PEP)

NCT04328961
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, SARS (Severe Acute Respiratory Syndrome), SARS-CoV-2
Interventions
Hydroxychloroquine Sulfate, Ascorbic Acid
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 80 Years
Enrollment
943 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
8
States / cities
Los Angeles, California • New Orleans, Louisiana • Baltimore, Maryland + 4 more
Source: ClinicalTrials.gov public record
Updated Dec 16, 2021 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Phase 2 Interventional Results available

Therapeutic Use of Intravenous Vitamin C in Allogeneic Stem Cell Transplant Recipients

NCT03613727
View directory record Official record
Conditions
Lymphoid Leukemia, Myeloid Leukemia, Monocytic Leukemia, Myelodysplasia
Interventions
Intravenous (IV) and oral Vitamin C
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 77 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Nov 7, 2023 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Phase 1 Interventional

Intravenous Vitamin C in Combination With Standard Chemotherapy for Pancreatic Cancer

NCT00954525
View directory record Official record
Conditions
Metastatic Pancreatic Cancer
Interventions
Gemcitabine and Erlotinib, Intravenous Vitamin C
Drug · Dietary Supplement
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Thomas Jefferson University
Other
Eligibility
18 Years to 75 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 2, 2025 · Synced Sep 30, 2026, 5:42 PM EDT
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 Sep 30, 2026, 5:42 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

An Investigation of a Multi-Function Skincare Product to Improve Aging, Eczema, and Acne Outcomes

NCT05873933
View directory record Official record
Conditions
Acne, Eczema, Skin Aging
Interventions
Hemptress Oil
Other
Lead sponsor
Hemptress
Industry
Eligibility
21 Years to 65 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Oct 9, 2024 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Ischemia/Reperfusion Injury of Human Endothelium: Role of Glucose and Statins

NCT00995670
View directory record Official record
Conditions
Hyperglycemia
Interventions
5% dextrose, Vitamin C, Simvastatin, Sevoflurane
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years to 35 Years
Enrollment
59 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Mar 17, 2015 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

RCT of an Oral Acne Supplement for Adult Women

NCT06097871
View directory record Official record
Conditions
Acne
Interventions
Skin Nutraceutical Supplement, Placebo pill
Dietary Supplement · Other
Lead sponsor
Nutraceutical Wellness Inc.
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
102 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
High Point, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 25, 2024 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Proof of Mechanism Study to Evaluate Binding of Alfa-synuclein

NCT05274568
View directory record Official record
Conditions
Parkinson Disease, Multisystem Atrophy, Healthy Volunteer
Interventions
[18F]UCB-2897
Drug
Lead sponsor
Invicro
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 20, 2025 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of the Safety and Tolerability of a Brightening Treatment Paired With a Skincare Regimen

NCT07501000
View directory record Official record
Conditions
Hyperpigmentation, Skin Ageing, Post Inflammatory Hyperpigmentation, Skin Roughness
Interventions
Brightening Treatment
Other
Lead sponsor
Revision Skincare
Industry
Eligibility
20 Years to 65 Years · Female only
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jun 5, 2026 · Synced Sep 30, 2026, 5:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of a Topical Cosmetic Product on Women's Hair

NCT06060834
View directory record Official record
Conditions
Hair Thinning, Hair Loss
Interventions
Topical Botanical Agent
Dietary Supplement
Lead sponsor
University of Memphis
Other
Eligibility
35 Years to 70 Years · Female only
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 9, 2025 · Synced Sep 30, 2026, 5:42 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 Sep 30, 2026, 5:42 PM EDT