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Showing 1–24 of 137 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin C 500 mg Clear all
Completed Phase 1 Interventional

High Dose Ascorbic Acid for Plasma Cell Disorders

NCT03602235
View directory record Official record
Conditions
Multiple Myeloma
Interventions
Ascorbate, Melphalan
Other · Drug
Lead sponsor
Christopher Strouse
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Oct 20, 2025 · Synced Sep 25, 2026, 2:12 PM EDT
Not listed Not applicable Interventional

Epigenetics, Vitamin C, and Abnormal Blood Cell Formation - Vitamin C in Patients With Low-Risk Myeloid Malignancies

NCT03682029
View directory record Official record
Conditions
Myelodysplastic Syndromes, Chronic Myelomonocytic Leukemia-1, Cytopenia
Interventions
Vitamin C (ascorbic acid), Placebo
Dietary Supplement · Other
Lead sponsor
Rigshospitalet, Denmark
Other
Eligibility
18 Years and older
Enrollment
109 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 16, 2024 · Synced Sep 25, 2026, 2:12 PM EDT
Completed Phase 4 Interventional

Effects of Vitamin C and E on Endothelial Function in Adolescent Diabetes

NCT02019186
View directory record Official record
Conditions
Type 1 Diabetes Mellitus
Interventions
Vitamin C, Vitamin E
Dietary Supplement
Lead sponsor
Nationwide Children's Hospital
Other
Eligibility
8 Years to 15 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 2, 2015 · Synced Sep 25, 2026, 2:12 PM 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Withdrawn Phase 2 Interventional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 5, 2019 · Synced Sep 25, 2026, 2:12 PM 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 22, 2026 · Synced Sep 25, 2026, 2:12 PM 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 18, 2020 · Synced Sep 25, 2026, 2:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of a Pre-Workout Dietary Supplement

NCT02952014
View directory record Official record
Conditions
Dietary Modification
Interventions
C4 Extreme, C4 Extreme (without Advantra Z, Placebo
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
18 Years to 40 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Nov 1, 2016 · Synced Sep 25, 2026, 2:12 PM EDT
Completed Phase 2 Interventional Results available

A Phase 2, Pharmacokinetic (PK) Study of 6R-BH4 Alone or 6R-BH4 With Vitamin C in Subjects With Endothelial Dysfunction

NCT00532844
View directory record Official record
Conditions
Endothelial Dysfunction
Interventions
Sapropterin Dihydrochloride, Sapropterin Dihydrochloride and Vitamin C
Drug
Lead sponsor
BioMarin Pharmaceutical
Industry
Eligibility
18 Years to 75 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Hackensack, New Jersey
Source: ClinicalTrials.gov public record
Updated May 16, 2021 · Synced Sep 25, 2026, 2:12 PM 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 25, 2026, 2:12 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 16, 2013 · Synced Sep 25, 2026, 2:12 PM EDT
Recruiting Phase 3 Interventional

Trial of IV vs Oral Iron Treatment of Iron Deficiency Anemia in the Post-Operative Bariatric Surgical Patient

NCT04268849
View directory record Official record
Conditions
Iron Deficiency Anemia
Interventions
Ferumoxytol, Saline, Ferrous sulfate tablets, Vitamin C
Drug
Lead sponsor
Auerbach Hematology Oncology Associates P C
Other
Eligibility
18 Years and older
Enrollment
104 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 2, 2025 · Synced Sep 25, 2026, 2:12 PM 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 28, 2025 · Synced Sep 25, 2026, 2:12 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

A Clinical Trial to Examine the Efficacy of a Supplement to Support Healthy Hair and Skin

NCT06579742
View directory record Official record
Conditions
Hair Thinning, Hair Loss
Interventions
Live Conscious Beyond Collagen, Placebo
Dietary Supplement
Lead sponsor
Scale Media Inc
Industry
Eligibility
40 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Aug 29, 2024 · Synced Sep 25, 2026, 2:12 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Micronutrients to Prevent Noise-induced Hearing Loss

NCT00808470
View directory record Official record
Conditions
Noise-Induced Hearing Loss
Interventions
beta-carotene, vitamins C and E, magnesium, Placebo
Drug · Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years to 35 Years
Enrollment
72 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2013
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 18, 2017 · Synced Sep 25, 2026, 2:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Supplementary Vitamins on Oxidant Gene Expression in the Lungs of Healthy Smokers

NCT00565214
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease (COPD)
Interventions
Group 1, Group 2
Dietary Supplement
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years to 70 Years
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 24, 2017 · Synced Sep 25, 2026, 2:12 PM 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 25, 2026, 2:12 PM EDT
Active, not recruiting Phase 2 Interventional Results available

A Phase 2 Study Adding Ascorbate to Chemotherapy and Radiation Therapy for NSCLC

NCT02905591
View directory record Official record
Conditions
Carcinoma, Non-Small-Cell Lung, Non-Small Cell Lung Cancer, Nonsmall Cell Lung Cancer, Non-Small-Cell Lung Carcinoma, NSCLC
Interventions
Radiation Therapy, Paclitaxel, Carboplatin, Ascorbic Acid
Drug
Lead sponsor
Joseph J. Cullen, MD, FACS
Other
Eligibility
18 Years and older
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2027
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jul 30, 2026 · Synced Sep 25, 2026, 2:12 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Administration of Intravenous Vitamin C in Novel Coronavirus Infection (COVID-19) and Decreased Oxygenation

NCT04357782
View directory record Official record
Conditions
COVID-19, Hypoxia
Interventions
L-ascorbic acid
Drug
Lead sponsor
Hunter Holmes Mcguire Veteran Affairs Medical Center
Federal
Eligibility
18 Years to 99 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 24, 2022 · Synced Sep 25, 2026, 2:12 PM EDT
Not yet 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
U.S. locations
1
States / cities
Carlsbad, California
Source: ClinicalTrials.gov public record
Updated Jun 16, 2026 · Synced Sep 25, 2026, 2:12 PM EDT
Withdrawn Not applicable Interventional

Effect of Ascorbic Acid Supplementation in Pregnancy on Anemia (AAA)

NCT03564756
View directory record Official record
Conditions
Anemia in Pregnancy
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
Fetal Medicine Foundation
Other
Eligibility
18 Years to 50 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Dayton, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 21, 2022 · Synced Sep 25, 2026, 2:12 PM EDT
Suspended Not applicable Interventional Accepts healthy volunteers

The Effect of Nutritional Supplementation on Actinic Purpura: A Pilot Study

NCT06840574
View directory record Official record
Conditions
Skin Health, Skin Aging of Face and Hands, Healthy, Ecchymosis
Interventions
Cyruta Plus: A Whole-Food Based Vitamin C supplement containing organic buckwheat (aerial parts) juice powder, organic buckwheat flour, bovine adrenal Cytosol™ extract, oat flour, honey, ascorbic acid, Low Dose Vitamin C, High Dose Vitamin C
Dietary Supplement
Lead sponsor
Standard Process Inc.
Industry
Eligibility
55 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Kannapolis, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 22, 2026 · Synced Sep 25, 2026, 2:12 PM EDT
Completed Phase 2 Interventional Results available

Acetaminophen and Ascorbate in Sepsis: Targeted Therapy to Enhance Recovery

NCT04291508
View directory record Official record
Conditions
Acute Respiratory Distress Syndrome, Critical Illness, Respiratory Failure, Sepsis
Interventions
Intravenous Acetaminophen (room temperature), Intravenous Vitamin C (refrigerated), 5% Dextrose (room temperature), 5% Dextrose refrigerated
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
488 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
41
States / cities
Birmingham, Alabama • Tucson, Arizona • Fresno, California + 34 more
Source: ClinicalTrials.gov public record
Updated Sep 26, 2024 · Synced Sep 25, 2026, 2:12 PM EDT
Completed Phase 2 Interventional Results available

A Phase 2 Trial of High-dose Ascorbate for Pancreatic Cancer (PACMAN 2.1)

NCT02905578
View directory record Official record
Conditions
Pancreatic Neoplasms, Cancer of Pancreas, Cancer of the Pancreas, Neoplasms, Pancreatic, Pancreas Cancer, Pancreas Neoplasms, Adenocarcinoma
Interventions
Gemcitabine, nab-paclitaxel, Pharmacological ascorbate
Drug
Lead sponsor
University of Iowa
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jul 22, 2026 · Synced Sep 25, 2026, 2:12 PM 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 12, 2013 · Synced Sep 25, 2026, 2:12 PM EDT