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ClinicalTrials.gov public records Last synced Oct 13, 2026, 2:45 PM EDT

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Showing 97–120 of 368 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic acid (Vitamin C) Clear all
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 13, 2026, 2:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Examining the Effect of Mental Health Disorders on Vascular Function and Exercise Tolerance

NCT03216980
View directory record Official record
Conditions
Mental Health Disorders
Interventions
PTSD/GAD Antioxidant, PTSD/GAD Placebo, Healthy Control Antioxidant, Healthy Control Placebo
Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 35 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2021
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Aug 25, 2021 · Synced Oct 13, 2026, 2:45 PM 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 5, 2026 · Synced Oct 13, 2026, 2:45 PM EDT
Completed Phase 1Phase 2 Interventional

Treatment of Newly Diagnosed Ovarian Cancer With Antioxidants

NCT00228319
View directory record Official record
Conditions
Ovarian Cancer
Interventions
Oral Ascorbic Acid, Paclitaxel, Carboplatin, Sodium Ascorbate, Oral Mixed natural Carotenoids with Vitamin A, Vitamin E
Dietary Supplement · Drug
Lead sponsor
Jeanne Drisko, MD, CNS, FACN
Other
Eligibility
18 Years and older · Female only
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 19, 2018 · Synced Oct 13, 2026, 2:45 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Mechanisms for Vascular Dysfunction and Exercise Tolerance in CF

NCT02690064
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Acute Antioxidant, Chronic Antioxidant, Placebo
Dietary Supplement · Other
Lead sponsor
Augusta University
Other
Eligibility
7 Years and older
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2027
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 28, 2025 · Synced Oct 13, 2026, 2:45 PM EDT
Withdrawn Phase 4 Interventional

Parenteral Ascorbic Acid Repletion in TransplantatIon

NCT04756063
View directory record Official record
Conditions
Liver Transplant Failure and Rejection
Interventions
Ascorbic acid, Placebo
Drug · Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 80 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2032
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 18, 2026 · Synced Oct 13, 2026, 2:45 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Combined Antioxidant and Preeclampsia Prediction Studies (CAPPS)

NCT00135707
View directory record Official record
Conditions
Preeclampsia
Interventions
Dietary Supplement/Vitamins, Placebo for Vitamin C and Vitamin E
Drug
Lead sponsor
The George Washington University Biostatistics Center
Other
Eligibility
Female only
Enrollment
10,154 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2009
U.S. locations
16
States / cities
Birmingham, Alabama • Chicago, Illinois • Detroit, Michigan + 13 more
Source: ClinicalTrials.gov public record
Updated Feb 21, 2019 · Synced Oct 13, 2026, 2:45 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 19, 2020 · Synced Oct 13, 2026, 2:45 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers

Investigation of Macular Pigment Augmentation on Dark Adaptation

NCT00478439
View directory record Official record
Conditions
Aging, Age-Related Macular Degeneration
Interventions
ZeaVision EyePromise Restore, Multivitamin
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
60 Years to 80 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Oct 27, 2010 · Synced Oct 13, 2026, 2:45 PM EDT
Terminated Phase 3 Interventional

Effect of IV Vitamin C, Thiamine, and Steroids on Mortality of Septic Shock

NCT03828929
View directory record Official record
Conditions
Septic Shock
Interventions
Vitamin C, Normal saline
Drug
Lead sponsor
New York Presbyterian Brooklyn Methodist Hospital
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Brooklyn, New York
Source: ClinicalTrials.gov public record
Updated Feb 10, 2020 · Synced Oct 13, 2026, 2:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Racial and Aging Effects of Acute Antioxidant Supplementation

NCT02157207
View directory record Official record
Conditions
Healthy
Interventions
Antioxidant, Placebo
Dietary Supplement · Other
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years to 75 Years
Enrollment
93 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 16, 2015 · Synced Oct 13, 2026, 2:45 PM EDT
Completed Phase 1 Interventional

Arsenic Trioxide and Ascorbic Acid Combined With Bortezomib, Thalidomide, and Dexamethasone in Treating Patients With Relapsed or Refractory Multiple Myeloma or Plasma Cell Leukemia

NCT00258245
View directory record Official record
Conditions
Multiple Myeloma and Plasma Cell Neoplasm
Interventions
ascorbic acid, arsenic trioxide, bortezomib, dexamethasone, thalidomide, Aspirin
Dietary Supplement · Drug
Lead sponsor
Barbara Ann Karmanos Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 29, 2013 · Synced Oct 13, 2026, 2:45 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Efficacy and Safety of Standard Oral Colonoscopic Preparations With or Without Neostigmine Compared to Pulse-Irrigation Colonic Lavage

NCT00745095
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
Neostigmine
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years and older
Enrollment
360 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2013
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Jul 16, 2014 · Synced Oct 13, 2026, 2:45 PM EDT
Recruiting Phase 1Phase 2 Interventional

Sympathetic-vascular Dysfunction in Obesity and Insulin Resistance (Vitamin C Study)

NCT04715022
View directory record Official record
Conditions
Hypertension, Cardiovascular Diseases
Interventions
Ascorbic acid solution (American Regent Laboratories Inc.), Saline
Drug
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
35 Years to 65 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 8, 2025 · Synced Oct 13, 2026, 2:45 PM EDT
Not listed Phase 2 Interventional

Delivery of Inhibitors of Lysyl Oxidase (LysoLox) on Serial Angioplasty and Time to Restenosis

NCT03106948
View directory record Official record
Conditions
Arteriovenous Fistula Occlusion
Interventions
Placebo, Ascorbic Acid, Cuprimine Oral Product
Drug
Lead sponsor
Southeast Renal Research Institute
Other
Eligibility
18 Years to 90 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Chattanooga, Tennessee
Source: ClinicalTrials.gov public record
Updated Sep 11, 2017 · Synced Oct 13, 2026, 2:45 PM EDT
Completed Phase 1Phase 2 Interventional Results available

High Dose Ascorbate With Preoperative Radiation in Patients With Locally Advanced Soft Tissue Sarcomas

NCT03508726
View directory record Official record
Conditions
Soft Tissue Sarcoma
Interventions
Ascorbate
Drug
Lead sponsor
Mohammed Milhem
Other
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jun 18, 2026 · Synced Oct 13, 2026, 2:45 PM EDT
Completed No phase listed Observational

VCSIP Follow-up Study

NCT03203603
View directory record Official record
Conditions
Asthma, Pulmonary Function, Wheezing, In Utero Nicotine
Interventions
No active intervention
Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
6 Months to 4 Years
Enrollment
242 participants
Timeline
2017 – 2024
U.S. locations
2
States / cities
Indianapolis, Indiana • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Mar 25, 2025 · Synced Oct 13, 2026, 2:45 PM EDT
Terminated Phase 2 Interventional Results available

Targeting Central Pulsatile Hemodynamics in Chronic Kidney Disease

NCT02791906
View directory record Official record
Conditions
Renal Insufficiency, Chronic
Interventions
ISMN, Vitamin C
Drug · Dietary Supplement
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 13, 2020 · Synced Oct 13, 2026, 2:45 PM EDT
Completed No phase listed Observational

Prospective Evaluation of Taste Function In Multiple Myeloma Patients Undergoing Autologous Hematopoietic Cell Transplantation

NCT03276481
View directory record Official record
Conditions
Multiple Myeloma
Interventions
Oral microbiota assessment, Comprehensive chemical gustometry, Measurement of salivary flow, Surveys assessing taste disturbances
Diagnostic Test · Behavioral
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
21 Years and older
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 14, 2023 · Synced Oct 13, 2026, 2:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Impact of Qualia Vitamin C+ on Blood Vitamin C Levels

NCT07285109
View directory record Official record
Conditions
Healthy, Suboptimal Vitamin C Levels
Interventions
Qualia Vitamin C+, Placebo
Dietary Supplement
Lead sponsor
Qualia Life Sciences
Industry
Eligibility
25 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Carlsbad, California
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Oct 13, 2026, 2:45 PM 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 13, 2026, 2:45 PM EDT
Completed Early Phase 1 Interventional

Topical Vitamin C for Treatment of Basal Cell Cancer

NCT04279535
View directory record Official record
Conditions
Basal Cell Carcinoma
Interventions
Topical Ascorbic Acid
Drug
Lead sponsor
Center for Biomedical Research, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Boise, Idaho
Source: ClinicalTrials.gov public record
Updated Nov 2, 2021 · Synced Oct 13, 2026, 2:45 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Pediatric COVID Outcomes Study (PECOS)

NCT04830852
View directory record Official record
Conditions
Covid19, MIS-C Associated With COVID-19, MIS-C Multisystem Inflammatory Syndrome in Children, SARS-CoV2 Infection
Interventions
Not listed
Lead sponsor
Children's National Research Institute
Other
Eligibility
0 Years to 21 Years
Enrollment
1,097 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 8, 2026 · Synced Oct 13, 2026, 2:45 PM EDT
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 13, 2026, 2:45 PM EDT