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ClinicalTrials.gov public records Last synced Oct 13, 2026, 6:39 PM EDT

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Showing 241–264 of 368 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic Acid (Vitamin C) Clear all
Recruiting Not applicable Interventional Accepts healthy volunteers

The Impact of Qualia Vitamin C+ on Individuals With Suboptimal and Adequate Vitamin C Levels

NCT07652346
View directory record Official record
Conditions
Healthy, Suboptimal Vitamin C Levels, Adequate Vitamin C Levels
Interventions
Qualia Vitamin C+, Placebo
Dietary Supplement · Other
Lead sponsor
Qualia Life Sciences
Industry
Eligibility
25 Years to 75 Years
Enrollment
152 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Carlsbad, California
Source: ClinicalTrials.gov public record
Updated Oct 5, 2026 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Pharmacokinetics Study of Intravenous Ascorbic Acid

NCT02534753
View directory record Official record
Conditions
Pharmacokinetics
Interventions
Ascor L 500® (Ascorbic Acid Injection, USP)
Drug
Lead sponsor
McGuff Pharmaceuticals, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 23, 2016 · Synced Oct 13, 2026, 6:39 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 Oct 13, 2026, 6:39 PM EDT
Completed Early Phase 1 Interventional

Exercise and NO in HFrEF

NCT03136029
View directory record Official record
Conditions
Heart Failure With Reduced Ejection Fraction
Interventions
Antioxidant, Tetrahydrobiopterin (BH4), Exercise training
Dietary Supplement · Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2025
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Aug 6, 2025 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

A Study of Hydroxychloroquine, Vitamin C, Vitamin D, and Zinc for the Prevention of COVID-19 Infection

NCT04335084
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 5, 2025 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Phase 2 Interventional Results available

High Dose Vitamin C Intravenous Infusion in Patients With Resectable or Metastatic Solid Tumor Malignancies

NCT03146962
View directory record Official record
Conditions
Colorectal Cancer, Pancreatic Cancer, Lung Cancer
Interventions
Vitamin C
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years and older
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
2
States / cities
Brooklyn, New York • New York, New York
Source: ClinicalTrials.gov public record
Updated May 2, 2024 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Phase 1 Interventional

Burn Micronutrient Repletion Pilot Study

NCT00879723
View directory record Official record
Conditions
Burn
Interventions
Vitamin and Mineral supplementation
Dietary Supplement
Lead sponsor
Southern Illinois University
Other
Eligibility
19 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Springfield, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 26, 2015 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Practicality of Intermittent Fasting and Its Effect on Markers of Aging and Oxidative Stress

NCT02132091
View directory record Official record
Conditions
Aging, Metabolism
Interventions
Intermittent Fasting, 400 IU Vitamin E, 1000 mg Vitamin C
Other · Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
19 Years to 30 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 14, 2015 · Synced Oct 13, 2026, 6:39 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 Oct 13, 2026, 6:39 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Antenatal Micronutrient Supplementation and Infant Survival

NCT00860470
View directory record Official record
Conditions
Infant Mortality, Preterm Birth, Low Birth Weight, Neonatal Mortality, Perinatal Mortality
Interventions
Iron (27 mg) - folic acid (600 ug), Multiple micronutrient
Dietary Supplement
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
12 Years to 45 Years · Female only
Enrollment
44,567 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 19, 2022 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

TKA Melatonin and Sleep Quality

NCT05332717
View directory record Official record
Conditions
Arthroplasty, Replacement, Knee, Sleep Initiation and Maintenance Disorders
Interventions
Melatonin 5 mg, Placebo (Vitamin C)
Dietary Supplement
Lead sponsor
Hospital for Special Surgery, New York
Other
Eligibility
18 Years and older
Enrollment
176 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 14, 2023 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin C to Decrease Effects of Smoking in Pregnancy on Infant Lung Function

NCT01723696
View directory record Official record
Conditions
Pulmonary Function; Newborn, Abnormal, Infant Wheeze, In-utero Nicotine, Second Hand Smoke
Interventions
Vitamin C +prenatal vitamin, Placebo tablet+prenatal vitamin
Dietary Supplement
Lead sponsor
Oregon Health and Science University
Other
Eligibility
15 Years and older · Female only
Enrollment
252 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
2
States / cities
Indianapolis, Indiana • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 17, 2019 · Synced Oct 13, 2026, 6:39 PM EDT
Terminated Not applicable Interventional

A Pilot Study of High-Dose, Intravenous Ascorbic Acid (Vitamin C) to Treat Hepatitis C

NCT01250743
View directory record Official record
Conditions
Hepatitis C
Interventions
ascorbic acid (vitamin C)
Dietary Supplement
Lead sponsor
Health Innovations, Frontier Research Institute
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Feb 18, 2011 · Synced Oct 13, 2026, 6:39 PM EDT
Completed No phase listed Observational

Effects of Low-density Lipoprotein (LDL) Apheresis on Inflammatory and Lipid Markers

NCT01138371
View directory record Official record
Conditions
Familial Hypercholesterolemia
Interventions
LDL Apheresis
Procedure
Lead sponsor
Emory University
Other
Eligibility
3 Years to 70 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Dec 17, 2013 · Synced Oct 13, 2026, 6:39 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Systemic Markers of Collagen Metabolism and Vitamin C in Smokers and Non-Smokers With Pelvic Organ Prolapse

NCT01548105
View directory record Official record
Conditions
Pelvic Organ Prolapse
Interventions
Blood draw for the study participants
Other
Lead sponsor
TriHealth Inc.
Other
Eligibility
18 Years and older · Female only
Enrollment
96 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 17, 2014 · Synced Oct 13, 2026, 6:39 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 Oct 13, 2026, 6:39 PM EDT
Completed No phase listed Observational

Vitamin C Supplementation to Pregnant Smokers: Follow-up of 2 Randomized Trials Plus Changes in DNA Methylation

NCT03206710
View directory record Official record
Conditions
Asthma, Wheezing, In Utero Nicotine, Pulmonary Function
Interventions
No current intervention
Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
6 Months to 11 Years
Enrollment
395 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
2
States / cities
Indianapolis, Indiana • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Mar 21, 2025 · Synced Oct 13, 2026, 6:39 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Single-Blind Study Assessing the Use of a Topical Antioxidant With A Series of Laser Procedures to Reduce Sebum Production

NCT06376110
View directory record Official record
Conditions
Acne
Interventions
Topical Antioxidant Serum, AviClear Laser
Drug · Device
Lead sponsor
Austin Institute for Clinical Research
Network
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Pflugerville, Texas
Source: ClinicalTrials.gov public record
Updated May 16, 2024 · Synced Oct 13, 2026, 6:39 PM EDT
Terminated Not applicable Interventional

Hyperglycemia and Oxidative Stress in the Human Brain With Diabetes

NCT00775541
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
In-Young Choi, Ph.D.
Other
Eligibility
30 Years to 55 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 18, 2012 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Safety and Tolerability of a Novel Amino-acid Based Hydration Drink in Healthy Volunteers

NCT05592951
View directory record Official record
Conditions
Safety, Tolerance
Interventions
Crystal Light (once serving), Liquid IV with amino acids (one serving), Liquid IV with amino acids (two servings), Liquid IV with amino acids (three servings)
Dietary Supplement
Lead sponsor
University of Memphis
Other
Eligibility
18 Years to 50 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Sep 26, 2023 · Synced Oct 13, 2026, 6:39 PM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers Results available

Evaluation and Treatment of Copper/Zinc Imbalance in Children With Autism

NCT00325572
View directory record Official record
Conditions
Autism, Pervasive Developmental Disorder
Interventions
oral zinc and vitamin C supplements, oral Placebo
Drug · Other
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
3 Years to 8 Years
Enrollment
89 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2011
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 17, 2019 · Synced Oct 13, 2026, 6:39 PM EDT
Terminated Phase 4 Interventional Results available

The Relationship of Hemoglobin A1c and Diabetic Wound Healing

NCT01350102
View directory record Official record
Conditions
Diabetes, Type 1, Diabetes, Type 2, Foot Ulcer, Diabetic
Interventions
Bacitracin, AmeriGel®, Vitamin C
Drug · Dietary Supplement
Lead sponsor
Susan Hassenbein
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 12, 2017 · Synced Oct 13, 2026, 6:39 PM EDT
Recruiting Not applicable Interventional

Living Well With Lymphoma

NCT06047626
View directory record Official record
Conditions
Lymphoma
Interventions
Fatigue Reduction Diet, General Health Curriculum
Other
Lead sponsor
University of Michigan Rogel Cancer Center
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 30, 2025 · Synced Oct 13, 2026, 6:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

An Investigation of the Effects of a Skin Serum Containing Propolis on Skin Health and Appearance

NCT06148740
View directory record Official record
Conditions
Skin Health
Interventions
Manuka Health Pro Vitality Daily Restorative Face Serum with Propolis & Vitamin C
Other
Lead sponsor
Manuka Health
Industry
Eligibility
30 Years to 42 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Nov 20, 2024 · Synced Oct 13, 2026, 6:39 PM EDT