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ClinicalTrials.gov public records Last synced Oct 13, 2026, 7:45 PM EDT

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Showing 289–312 of 368 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic acid (Vitamin C) Clear all
Completed Phase 1 Interventional

Anti-Oxidant Treatment of Alzheimer's Disease

NCT00117403
View directory record Official record
Conditions
Alzheimer's Disease
Interventions
Vitamin E, Vitamin C, and Alpha-lipoic Acid, Coenzyme Q, Placebo capsules, Placebo wafers
Drug
Lead sponsor
National Institute on Aging (NIA)
NIH
Eligibility
60 Years to 85 Years
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
13
States / cities
Tucson, Arizona • Irvine, California • La Jolla, California + 10 more
Source: ClinicalTrials.gov public record
Updated Apr 3, 2009 · Synced Oct 13, 2026, 7:45 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Antioxidant Bioavailability

NCT04463030
View directory record Official record
Conditions
Pharmacokinetics
Interventions
Liposomal vitamin C, 1 gram, Liposomal vitamin C, 2 grams, Liposomal vitamin C, 5 grams, Placebo
Dietary Supplement
Lead sponsor
Natural Immune Systems Inc
Other
Eligibility
18 Years to 70 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Klamath Falls, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 27, 2022 · Synced Oct 13, 2026, 7:45 PM EDT
Withdrawn Not applicable Interventional

The Effect of High Dose Vitamin C in Burn Patients

NCT00350077
View directory record Official record
Conditions
Burns
Interventions
Intravenous Vitamin C, Vitamin C
Drug
Lead sponsor
United States Army Institute of Surgical Research
Federal
Eligibility
18 Years to 72 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Fort Sam Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 20, 2011 · Synced Oct 13, 2026, 7:45 PM EDT
Terminated Phase 2 Interventional

Trial of GM-CSF Given in Combination With Ketoconazole and Mitoxantrone in Patients With Progressive Prostate Cancer

NCT00447473
View directory record Official record
Conditions
Prostatic Neoplasms
Interventions
GM-CSF, Ketoconazole, Mitoxantrone
Drug
Lead sponsor
The Methodist Hospital Research Institute
Other
Eligibility
18 Years and older · Male only
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 17, 2016 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Front-of-package Marketing on Fruit Drinks: Online RCT

NCT04811690
View directory record Official record
Conditions
Consumer Behavior, Consumer Preference
Interventions
front-of-package modification
Behavioral
Lead sponsor
Harvard School of Public Health (HSPH)
Other
Eligibility
18 Years and older
Enrollment
5,028 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 28, 2021 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Multi-Center, Open-label Study Evaluate the Efficacy and Tolerability of a Dual Skincare Regimen Treatment for Facial Hyperpigmentation and Photodamaged Skin in Patients Exposed to Extrinsic Factors of Aging

NCT05423873
View directory record Official record
Conditions
Hyperpigmentation, Photodamaged Skin, Wrinkle, Fine Lines
Interventions
Gentle Cleansing Lotion, Revision Skincare
Other
Lead sponsor
Revision Skincare
Industry
Eligibility
35 Years to 60 Years · Female only
Enrollment
33 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
3
States / cities
Solana Beach, California • Greenwood Village, Colorado • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jun 21, 2022 · Synced Oct 13, 2026, 7:45 PM EDT
Not listed Phase 1 Interventional

Evaluation of Ascorbate-Meglumine Therapeutic for SRS

NCT06433791
View directory record Official record
Conditions
Safety
Interventions
Ascorbate-Meglumine
Drug
Lead sponsor
LadeRx LLC
Industry
Eligibility
18 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 19, 2024 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Phase 2 Interventional Results available

Vitamin C Infusion for Treatment in Sepsis Induced Acute Lung Injury

NCT02106975
View directory record Official record
Conditions
Acute Lung Injury, Sepsis
Interventions
Ascorbic Acid, Placebo: 5% Dextrose in water
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
170 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
5
States / cities
Atlanta, Georgia • Lexington, Kentucky • Cleveland, Ohio + 2 more
Source: ClinicalTrials.gov public record
Updated Oct 15, 2019 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Not applicable Interventional Results available

Trial of Glutamine and Antioxidant Supplementation in Critically Ill Patients

NCT00133978
View directory record Official record
Conditions
Critical Illness, Sepsis, Multiple Organ Failure
Interventions
Glutamine, Antioxidants, Glutamine + Antioxidants, Placebo
Other
Lead sponsor
Daren K. Heyland
Other
Eligibility
18 Years and older
Enrollment
1,223 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
5
States / cities
Aurora, Colorado • Louisville, Kentucky • Dayton, Ohio + 2 more
Source: ClinicalTrials.gov public record
Updated Jan 7, 2021 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Topical Absorption of Glutathione-cyclodextrin Complex in Healthy Human Subjects Improves Immune Response Against Mycobacterium Infection

NCT05926245
View directory record Official record
Conditions
Glutathione-cyclodextrin Complex Absorption
Interventions
Glutaryl Solution, Placebo Solution
Dietary Supplement
Lead sponsor
Western University of Health Sciences
Other
Eligibility
21 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Pomona, California
Source: ClinicalTrials.gov public record
Updated Jul 3, 2023 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A 16-week Clinical Study Investigating a Dark Spot Corrector Serum in Women With Moderate Discrete Hyperpigmentation

NCT07468175
View directory record Official record
Conditions
Hyperpigmentation, Dark Spots
Interventions
Cosmetic dark spot corrector serum
Other
Lead sponsor
Revision Skincare
Industry
Eligibility
25 Years to 65 Years · Female only
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Richardson, Texas
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Phase 3 Interventional Results available

Prophylaxis to Reduce Postoperative Atrial Fibrillation in Cardiac Surgery

NCT00953212
View directory record Official record
Conditions
Atrial Fibrillation, Atrial Flutter
Interventions
beta blockers, amiodarone, ascorbic acid
Drug
Lead sponsor
MaineHealth
Other
Eligibility
18 Years and older
Enrollment
304 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Portland, Maine
Source: ClinicalTrials.gov public record
Updated Apr 26, 2018 · Synced Oct 13, 2026, 7:45 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 23, 2026 · Synced Oct 13, 2026, 7:45 PM EDT
Not yet recruiting Not applicable Interventional

Plasma Lipids-Dependent Vitamin E Metabolism During Dynamic Hyperlipidemia

NCT07715890
View directory record Official record
Conditions
Lipid Metabolism Disorders
Interventions
High fat liquid shake
Dietary Supplement
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
18 Years to 65 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 13, 2026 · Synced Oct 13, 2026, 7:45 PM EDT
Recruiting Early Phase 1 Interventional

Single Versus Multi-Dose Oral and Intravenous Tranexamic Acid Patients at High Risk for Blood Transfusion After Spine Surgery

NCT03849443
View directory record Official record
Conditions
Open Posterior Thoracolumbar Spinal Fusion Procedure
Interventions
Tranexamic Acid Injectable Product (1000 mg intravenous bolus), Vitamin C 250 MG Oral Tablet, Tranexamic Acid 650Mg Tablet
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years and older
Enrollment
604 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2027
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 8, 2026 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

An Exploratory Investigation of a Supplement to Promote Cognitive Health Benefits

NCT05523115
View directory record Official record
Conditions
Anxiety, Stress, Memory Deficits, Cortisol Overproduction
Interventions
Heights Smart Supplement
Dietary Supplement
Lead sponsor
Heights
Industry
Eligibility
21 Years to 70 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Nov 8, 2022 · Synced Oct 13, 2026, 7:45 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 Oct 13, 2026, 7:45 PM EDT
Completed Phase 1 Interventional

A Phase I Trial of High-Dose Ascorbate in Glioblastoma Multiforme

NCT01752491
View directory record Official record
Conditions
Glioblastoma, GBM, Glioblastoma Multiforme
Interventions
Ascorbate, Temozolomide, Radiation therapy
Drug · Radiation
Lead sponsor
Joseph J. Cullen, MD, FACS
Other
Eligibility
18 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2019
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Dec 20, 2024 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Phase 1 Interventional

A Phase I Study of High-dose L-methylfolate in Combination With Temozolomide and Bevacizumab in Recurrent High Grade Glioma

NCT01891747
View directory record Official record
Conditions
Malignant Glioma
Interventions
Bevacizumab, Temozolomide, Vitamin C
Drug · Dietary Supplement
Lead sponsor
Vanderbilt-Ingram Cancer Center
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2022
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Mar 10, 2022 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

A Study Evaluating Quality of Life Parameters Following Use of Emergen-C

NCT06654089
View directory record Official record
Conditions
Dietary Supplements
Interventions
Emergen-C Core Super Orange Powder, Placebo
Dietary Supplement
Lead sponsor
HALEON
Industry
Eligibility
18 Years to 64 Years
Enrollment
299 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 7, 2026 · Synced Oct 13, 2026, 7:45 PM EDT
Active, not recruiting Phase 1 Interventional Results available

A Safety Study of Pharmacologic Ascorbate and Ferumoxytol in Addition to Standard of Care Chemoradiation in Glioblastoma

NCT04900792
View directory record Official record
Conditions
Glioblastoma, Glioblastoma Multiforme
Interventions
Ferumoxytol injection, Pharmacological ascorbate, External beam radiation therapy, Temozolomide
Drug · Radiation
Lead sponsor
Bryan Allen
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jul 20, 2026 · Synced Oct 13, 2026, 7:45 PM EDT
Withdrawn Phase 4 Interventional

Single Versus Multi-Dose Oral Tranexamic Acid in Patients at High Risk for Blood Transfusion After Total Joint Arthroplasty

NCT02926651
View directory record Official record
Conditions
Anemia, Arthritis, Total Knee Arthroplasty, Total Hip Arthroplasty
Interventions
Conventional Oral TXA (Tranexamic Acid), Multi-Dose Oral TXA (Tranexamic Acid)
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Oct 26, 2021 · Synced Oct 13, 2026, 7:45 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 28, 2021 · Synced Oct 13, 2026, 7:45 PM EDT
Completed Phase 2 Interventional

Bortezomib, Ascorbic Acid, and Melphalan in Treating Patients With Newly Diagnosed Multiple Myeloma

NCT00317811
View directory record Official record
Conditions
Multiple Myeloma and Plasma Cell Neoplasm
Interventions
ascorbic acid, bortezomib, melphalan
Dietary Supplement · Drug
Lead sponsor
Oncotherapeutics
Industry
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2005
U.S. locations
8
States / cities
Fresno, California • Orange, California • West Hollywood, California + 5 more
Source: ClinicalTrials.gov public record
Updated Nov 6, 2013 · Synced Oct 13, 2026, 7:45 PM EDT