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ClinicalTrials.gov public records Last synced Oct 11, 2026, 4:43 AM EDT

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Showing 73–96 of 137 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin C 500 mg Clear all
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Efficacy and Safety of Clear Skin Formula on Mitigating Mild to Moderate Non-cystic Acne

NCT05879406
View directory record Official record
Conditions
Non-Cystic Acne
Interventions
VitaMedica® Clear Skin Formula capsules, Placebo Capsules
Dietary Supplement · Other
Lead sponsor
Ablon Skin Institute Research Center
Other
Eligibility
18 Years to 40 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Manhattan Beach, California
Source: ClinicalTrials.gov public record
Updated Apr 6, 2025 · Synced Oct 11, 2026, 4:43 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

The Effects of Vitamin E and Vitamin C and Exercise

NCT01369043
View directory record Official record
Conditions
Exercise and Non-exercise Effect Upon Vitamins E and C
Interventions
Vitamin E and Vitamin C
Dietary Supplement
Lead sponsor
USDA Grand Forks Human Nutrition Research Center
Federal
Eligibility
30 Years to 50 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Grand Forks, North Dakota
Source: ClinicalTrials.gov public record
Updated Mar 9, 2015 · Synced Oct 11, 2026, 4:43 AM 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 11, 2026, 4:43 AM 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 Oct 11, 2026, 4:43 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Estrogen and Diabetes

NCT03436992
View directory record Official record
Conditions
Diabetes Mellitus, Type 1
Interventions
Antioxidant Cocktail, Resveratrol, Placebo
Dietary Supplement · Other
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 40 Years
Enrollment
143 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2023
U.S. locations
2
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Feb 17, 2025 · Synced Oct 11, 2026, 4:43 AM EDT
Suspended Phase 4 Interventional

Hydroxychloroquine in Patients With Newly Diagnosed COVID-19 Compared to Standard of Care

NCT04334967
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, SARS-CoV-2, 2019-nCoV, 2019 Novel Coronavirus
Interventions
Hydroxychloroquine, Vitamin C
Drug · Dietary Supplement
Lead sponsor
Providence Health & Services
Other
Eligibility
45 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 16, 2020 · Synced Oct 11, 2026, 4:43 AM 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 11, 2026, 4:43 AM EDT
Completed Phase 2 Interventional

Arsenic Trioxide, Ascorbic Acid, Dexamethasone, and Thalidomide in Myelofibrosis/Myeloproliferative Disorder

NCT00274820
View directory record Official record
Conditions
Chronic Myeloproliferative Disorders, Leukemia, Myelodysplastic Syndromes, Myelodysplastic/Myeloproliferative Diseases
Interventions
ascorbic acid, arsenic trioxide, dexamethasone, thalidomide
Dietary Supplement · Drug
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
18 Years to 120 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
2
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 27, 2020 · Synced Oct 11, 2026, 4:43 AM EDT
Terminated Not applicable Interventional

The Effect of Lysulin on Glycemic Control and Advanced Glycation

NCT04234581
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Lysulin
Dietary Supplement
Lead sponsor
Juraj Koska
Federal
Eligibility
21 Years to 75 Years
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
2
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Oct 19, 2020 · Synced Oct 11, 2026, 4:43 AM EDT
Completed No phase listed Observational

Vitamins, Breastmilk HIV Shedding, and Child Health

NCT00197756
View directory record Official record
Conditions
Maternal and Child Health Outcomes
Interventions
Vitamin A alone, Multivitamins excluding vitamin A, multivitamins including vitamin A, Placebo
Dietary Supplement · Other
Lead sponsor
Harvard School of Public Health (HSPH)
Other
Eligibility
18 Years and older · Female only
Enrollment
771 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 21, 2009 · Synced Oct 11, 2026, 4:43 AM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

A Study to Assess the Impact of a Nutritional Supplement on Wellbeing and Nutrient Absorption

NCT06749808
View directory record Official record
Conditions
Nutrition Status
Interventions
Carotenoid Nutritional Supplement, Placebo
Dietary Supplement
Lead sponsor
Pharmanex
Industry
Eligibility
20 Years to 65 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Provo, Utah
Source: ClinicalTrials.gov public record
Updated Dec 31, 2024 · Synced Oct 11, 2026, 4:43 AM EDT
Completed Phase 2 Interventional Results available

Alii Supplement Study

NCT07271316
View directory record Official record
Conditions
Nutrient Deficiency, Happiness, Digestive Health, Vulnerability to Disease, Mood Swings, Energy
Interventions
Alii Supplement
Dietary Supplement
Lead sponsor
Texas Christian University
Other
Eligibility
18 Years to 25 Years · Female only
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Fort Worth, Texas
Source: ClinicalTrials.gov public record
Updated Jul 13, 2026 · Synced Oct 11, 2026, 4:43 AM 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 11, 2026, 4:43 AM EDT
Completed Not applicable Interventional

Vitamin C and Cardiovascular Risk

NCT00534014
View directory record Official record
Conditions
Atherosclerosis, Type 2 Diabetes
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
University of New Mexico
Other
Eligibility
18 Years to 75 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Mar 12, 2024 · Synced Oct 11, 2026, 4:43 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Arsenic Trioxide With Ascorbic Acid and Melphalan for Myeloma Patients

NCT00661544
View directory record Official record
Conditions
Multiple Myeloma, Stem Cell Transplantation
Interventions
Arsenic Trioxide, Melphalan, Ascorbic Acid
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
Up to 70 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2007
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 4, 2013 · Synced Oct 11, 2026, 4:43 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Long Term Nitric Oxide Bioavailability on Vascular Health in Chronic Obstructive Pulmonary Disease

NCT02774226
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease (COPD)
Interventions
Tetrahydrobiopterin (BH4), Antioxidant Cocktail
Drug · Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Feb 23, 2021 · Synced Oct 11, 2026, 4:43 AM 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 11, 2026, 4:43 AM EDT
Withdrawn Phase 2 Interventional

The Effect of Vitamin C on Growth Hormone Secretion

NCT01537094
View directory record Official record
Conditions
Obese, Disorder of Vitamin C, Growth Hormone Secretion Abnormality
Interventions
Placebo, Vitamin C 250 mg once daily, Vitamin C 1,000 mg once daily
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 60 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 13, 2013 · Synced Oct 11, 2026, 4:43 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Hmong Microbiome ANd Gout, Obesity, Vitamin C (HMANGO-C)

NCT04938024
View directory record Official record
Conditions
Hyperuricemia, Gout
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
135 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 7, 2023 · Synced Oct 11, 2026, 4:43 AM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

A Study to Learn About How Safe BAY3389934 is and How it Affects Blood Clotting When Given Alone or With Aspirin in Healthy Participants

NCT07652723
View directory record Official record
Conditions
Drug-drug Interaction
Interventions
Aspirin, BAY3389934
Drug
Lead sponsor
Bayer
Industry
Eligibility
18 Years to 55 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Sep 23, 2026 · Synced Oct 11, 2026, 4:43 AM EDT
Withdrawn Phase 2 Interventional

Vitamin C for Severe Thermal Injuries

NCT01587261
View directory record Official record
Conditions
Severe Thermal Injury, Greater Than 20% TBSA
Interventions
Vitamin C, Placebo
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Mar 6, 2019 · Synced Oct 11, 2026, 4:43 AM EDT
Terminated Phase 2 Interventional Results available

Phase II Study of PARP Inhibitor Olaparib and IV Ascorbate in Castration Resistant Prostate Cancer

NCT05501548
View directory record Official record
Conditions
Prostate Cancer, Castration-resistant Prostate Cancer
Interventions
Olaparib, Vitamin C
Drug · Dietary Supplement
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years and older · Male only
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 29, 2025 · Synced Oct 11, 2026, 4:43 AM EDT
Completed Not applicable Interventional Results available

Vitamin C Supplementation Intervention

NCT04036110
View directory record Official record
Conditions
Heart Failure
Interventions
Vitamin C 500 mg, Vitamin C 1000 mg, Placebo
Dietary Supplement · Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 99 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 9, 2021 · Synced Oct 11, 2026, 4:43 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 22, 2025 · Synced Oct 11, 2026, 4:43 AM EDT