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Showing 1–24 of 367 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin C (Ascorbic Acid) Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of the Effects of a Daily Supplement 4Life Transfer Factor Vista Containing AREDS2 Formula on Skin Carotenoid Levels Using a Non-invasive Detection

NCT07513597
View directory record Official record
Conditions
Skin Carotenoids
Interventions
Dietary Supplement
Other
Lead sponsor
4Life Research, LLC
Industry
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Sandy City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 6, 2026 · Synced Sep 29, 2026, 10:58 AM EDT
Terminated Phase 2 Interventional Results available

Docetaxel With or Without Ascorbic Acid in Treating Patients With Metastatic Prostate Cancer

NCT02516670
View directory record Official record
Conditions
Hormone-Resistant Prostate Cancer, Metastatic Prostate Carcinoma, Stage IV Prostate Cancer
Interventions
Ascorbic Acid, Docetaxel, Laboratory Biomarker Analysis, Pharmacological Study, Placebo, Quality-of-Life Assessment
Dietary Supplement · Drug · Other
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years and older · Male only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
6
States / cities
Washington D.C., District of Columbia • Annapolis, Maryland • Baltimore, Maryland + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 6, 2023 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Phase 1 Interventional

Use of ARINA-1 in an Intermediate Size Patient Population of Bilateral Lung Transplant Patients With CLAD Grade 0

NCT03226431
View directory record Official record
Conditions
Lung Transplant
Interventions
Ascorbic Acid
Drug
Lead sponsor
Duke University
Other
Eligibility
21 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 4, 2019 · Synced Sep 29, 2026, 10:58 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Vascular Function and Oxidative Stress in Emergency Medical Responders

NCT06985394
View directory record Official record
Conditions
Cardiovascular Function in EMTs
Interventions
Antioxidant cocktail, Placebo
Dietary Supplement
Lead sponsor
University of Delaware
Other
Eligibility
20 Years to 40 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Newark, Delaware
Source: ClinicalTrials.gov public record
Updated May 21, 2025 · Synced Sep 29, 2026, 10:58 AM 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 25, 2023 · Synced Sep 29, 2026, 10:58 AM 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 4, 2023 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Combinatorial Nutritional Supplementation on Immune Function in Healthy Older Adults

NCT02876315
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Redoxon VI, placebo
Dietary Supplement
Lead sponsor
Oregon State University
Other
Eligibility
55 Years to 75 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Corvallis, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 30, 2022 · Synced Sep 29, 2026, 10:58 AM 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 4, 2026 · Synced Sep 29, 2026, 10:58 AM EDT
Terminated Phase 1 Interventional Results available

Temozolomide and Ascorbic Acid in Treating Patients With Recurrent High-Grade Glioma

NCT02168270
View directory record Official record
Conditions
Anaplastic Astrocytoma, Anaplastic Oligodendroglioma, Anaplastic Oligoastrocytoma, Glioblastoma, Gliosarcoma
Interventions
ascorbic acid, temozolomide, quality-of-life assessment, laboratory biomarker analysis
Dietary Supplement · Drug · Other
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Nov 23, 2023 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Not applicable Interventional

Study of Glutathione, Vitamin C and Cysteine in Children With Autism and Severe Behavior Problems

NCT00889538
View directory record Official record
Conditions
Autism, Severe Behavior Disorder
Interventions
placebo, glutathione, glutathione, vit C and NAC
Drug
Lead sponsor
University of Louisville
Other
Eligibility
5 Years to 16 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Dec 6, 2016 · Synced Sep 29, 2026, 10:58 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Influence of Obesity on Endogenous Oxalate Synthesis

NCT03704350
View directory record Official record
Conditions
Kidney Stone
Interventions
controlled diet
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 60 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2026
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Mar 18, 2026 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Hesperidin and Bone Health in Postmenopausal Women

NCT01881204
View directory record Official record
Conditions
Osteoporosis, Postmenopausal
Interventions
Hesperidin and Calcilock, Hesperidin, Control
Dietary Supplement
Lead sponsor
Purdue University
Other
Eligibility
Female only
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 16, 2018 · Synced Sep 29, 2026, 10:58 AM EDT
Terminated Not applicable Interventional

Soy Modulation of Immune Activation, LDL- Levels, and Lowering Inflammation by Pretzel Isoflavone Dietary Intervention

NCT02818283
View directory record Official record
Conditions
Human Immunodeficiency Virus (HIV) Infection, Hypercholesterolemia
Interventions
Soy Pretzel, Wheat Pretzel
Dietary Supplement · Other
Lead sponsor
Ohio State University
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 5, 2023 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Gender, Obesity, C-Reactive Protein, and Oxidative Stress

NCT00079963
View directory record Official record
Conditions
Cardiovascular Disease
Interventions
Vitamin C, Vitamin E, Placebo
Dietary Supplement
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years and older
Enrollment
396 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2008
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Sep 26, 2017 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Nuun Instant on Hydration Status in Active Men and Women

NCT04764565
View directory record Official record
Conditions
Hydration
Interventions
Nuun Instant, Water, Nuun Electrolyte
Dietary Supplement · Other
Lead sponsor
University of Memphis
Other
Eligibility
18 Years to 45 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 27, 2021 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Phase 2 Interventional Results available

Metabolic Resuscitation Using Ascorbic Acid, Thiamine, and Glucocorticoids in Sepsis.

NCT03422159
View directory record Official record
Conditions
Sepsis, Severe, Septic Shock
Interventions
Ascorbic Acid, Thiamine, Hydrocortisone, Sodium Chloride 0.9%
Drug
Lead sponsor
Community Medical Center, Toms River, NJ
Other
Eligibility
18 Years and older
Enrollment
140 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
2
States / cities
Lakewood, New Jersey • Toms River, New Jersey
Source: ClinicalTrials.gov public record
Updated Sep 20, 2021 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Early Phase 1 Interventional Results available

Treatment of HFpEF With Nitrate Supplement

NCT03289481
View directory record Official record
Conditions
Heart Failure With Normal Ejection Fraction
Interventions
Active lozenge, Placebo
Dietary Supplement · Drug
Lead sponsor
MaineHealth
Other
Eligibility
18 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Rockport, Maine
Source: ClinicalTrials.gov public record
Updated Oct 5, 2021 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Quantitative in Vivo Biomarkers of Oxidative Stress in Diabetes

NCT00845130
View directory record Official record
Conditions
Type 2 Diabetes, Oxidative Stress
Interventions
ascorbic acid (Vitamin C)
Biological
Lead sponsor
In-Young Choi, Ph.D.
Other
Eligibility
30 Years to 55 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2014
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated May 2, 2018 · Synced Sep 29, 2026, 10:58 AM EDT
Not listed Not applicable Interventional

Supplemental Adjuvants for Intracellular Nutrition and Treatment

NCT00893724
View directory record Official record
Conditions
Neovascular Age-related Macular Degeneration, Diabetic Macular Edema
Interventions
Neutral pills with no medicinal effect, Inosine; Tocopherols, Tocotrienol, CoQ10 combination capsule; Niacinamide SR; Viatmin C; N-acetyl Cysteine; Complete Multivitamin with all minerals, Inosine; Tocopherol, Tocotrienol, CoQ10 combination capsule; Niacinamide; Vitamin C; N-acetyl Cysteine; Complete Multivitamin with all minerals; Minocycline
Drug · Dietary Supplement
Lead sponsor
Mid-Atlantic Retina Consultations, Inc.
Other
Eligibility
Not listed
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Morgantown, West Virginia
Source: ClinicalTrials.gov public record
Updated Jul 19, 2011 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Composition for Treating Cirrhosis and Liver Cancer (SB-1121)

NCT05178303
View directory record Official record
Conditions
Cirrhosis of the Liver
Interventions
SB-1121(1), SB-1121(2)
Drug
Lead sponsor
Nguyen Thi Trieu, MD
Individual
Eligibility
18 Years to 80 Years
Enrollment
134 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2021
U.S. locations
1
States / cities
Wilmington, Delaware
Source: ClinicalTrials.gov public record
Updated May 15, 2025 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Phase 2 Interventional

A Study of Quintuple Therapy to Treat COVID-19 Infection

NCT04334512
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, Coronavirus-19, Sars-CoV2
Interventions
Hydroxychloroquine, Azithromycin, Vitamin C, Vitamin D, Zinc
Drug · Dietary Supplement
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
118 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Feb 28, 2024 · Synced Sep 29, 2026, 10:58 AM 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 29, 2025 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Placebo-Controlled Study Assessing the Use of a Novel Exfoliative Serum With A Chemical Peel to Improve Photodamage in Adults

NCT05908825
View directory record Official record
Conditions
Photodamaged Skin
Interventions
Vitamin C with AHA Exfoliative Serum, Placebo serum
Drug
Lead sponsor
Austin Institute for Clinical Research
Network
Eligibility
30 Years to 65 Years · Female only
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Pflugerville, Texas
Source: ClinicalTrials.gov public record
Updated Jul 18, 2024 · Synced Sep 29, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of a Nitric Oxide Supplementation Product on Endothelial Dysfunction and Prehypertensive Adults

NCT03895749
View directory record Official record
Conditions
Hypertension
Interventions
NEO40 Daily
Dietary Supplement
Lead sponsor
Hypertension Institute, Nashville
Other
Eligibility
18 Years to 75 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 29, 2019 · Synced Sep 29, 2026, 10:58 AM EDT