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ClinicalTrials.gov public records Last synced Oct 13, 2026, 9:08 AM EDT

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Showing 49–72 of 368 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic acid (Vitamin C) Clear all
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 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Mechanisms of Impaired Brain Blood Flow With Aging

NCT03775382
View directory record Official record
Conditions
Aging
Interventions
Ascorbic Acid, Normal Saline
Other
Lead sponsor
University of Delaware
Other
Eligibility
18 Years to 79 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
Newark, Delaware
Source: ClinicalTrials.gov public record
Updated May 10, 2023 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Phase 2 Interventional Results available

Ph 2 Trial of Vitamin C & G-FLIP (Low Doses Gemcitabine, 5FU, Leucovorin, Irinotecan, Oxaliplatin) for Pancreatic Cancer

NCT01905150
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
G-FLIP, G-FLIP-DM, Vitamin C
Drug · Dietary Supplement
Lead sponsor
Bruckner Oncology
Other
Eligibility
18 Years and older
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Dec 11, 2024 · Synced Oct 13, 2026, 9:08 AM EDT
Completed No phase listed Observational

Low Dose Vitamin C in Burns >20% Compared to Previous Studies With High Dose Vitamin C

NCT05612867
View directory record Official record
Conditions
Burns, Ascorbic Acid Deficiency, Burn Shock, Burn Degree Second, Burn Degree Third, Fluid and Electrolyte Imbalance
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
Arrowhead Regional Medical Center
Other
Eligibility
Not listed
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Colton, California
Source: ClinicalTrials.gov public record
Updated Nov 10, 2022 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

HYPEROXIA Responses and ROS

NCT05958303
View directory record Official record
Conditions
Cerebrovascular Disorders
Interventions
Antioxidant Cocktail, Placebo
Dietary Supplement · Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 40 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 7, 2026 · Synced Oct 13, 2026, 9:08 AM EDT
Terminated Phase 2 Interventional Results available

Pilot Trial of Intravenous Vitamin C in Refractory Non-Hodgkin Lymphoma (NHL)

NCT00626444
View directory record Official record
Conditions
Non-Hodgkin Lymphoma
Interventions
Intravenous vitamin C
Drug
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Thomas Jefferson University
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 16, 2025 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Zinc Versus Multivitamin Micronutrient Supplementation in the Setting of COVID-19

NCT04551339
View directory record Official record
Conditions
Healthy, Health Care Worker Patient Transmission, Aging
Interventions
PreserVision AREDS formulation soft gels or tablets, Multivitamin with 11mg of zinc
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 90 Years
Enrollment
2,700 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
3
States / cities
Scottsdale, Arizona • Jacksonville, Florida • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 10, 2021 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Broccoli Seed Extract and Skin Health

NCT05745636
View directory record Official record
Conditions
Skin Inflammation
Interventions
Broccoli, mustard, vitamin C, Placebo
Dietary Supplement
Lead sponsor
Appalachian State University
Other
Eligibility
25 Years to 57 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Kannapolis, North Carolina
Source: ClinicalTrials.gov public record
Updated Dec 20, 2023 · Synced Oct 13, 2026, 9:08 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Impact of Phenylalanine Elevations on Brain and Cognition in Adult PKU Carriers

NCT07220265
View directory record Official record
Conditions
Carrier of Phenylketonuria, Healthy
Interventions
Phenylalanine (Phe), Placebo
Dietary Supplement
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years to 60 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 11, 2026 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Phase 1Phase 2 Interventional

Arsenic Trioxide Plus Vitamin C in Treating Patients With Recurrent or Refractory Multiple Myeloma

NCT00006021
View directory record Official record
Conditions
Multiple Myeloma and Plasma Cell Neoplasm
Interventions
ascorbic acid, arsenic trioxide
Dietary Supplement · Drug
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 120 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2007
U.S. locations
4
States / cities
Miami, Florida • Miami Beach, Florida
Source: ClinicalTrials.gov public record
Updated Dec 15, 2016 · Synced Oct 13, 2026, 9:08 AM EDT
Recruiting Phase 1 Interventional

SHARON: A Clinical Trial for Metastatic Cancer Using Chemotherapy and Patients' Own Stem Cells

NCT04150042
View directory record Official record
Conditions
Pancreatic Adenocarcinoma Metastatic, BRCA1 Mutation, BRCA2 Mutation, Pancreatic Acinar Cell Carcinoma, Pancreatic Ductal Adenocarcinoma, Pancreatic Cancer, Metastatic Pancreatic Cancer, Metastatic Pancreatic Ductal Adenocarcinoma, Breast Cancer Metastatic, Breast Cancer Stage IV, Pancreatic Cancer Stage IV, HER2-negative Breast Cancer, HER2 Negative Breast Carcinoma, Adenocarcinoma of the Breast, PALB2 Gene Mutation, Pancreas Cancer, Metastatic, Pancreas Cancer, Recurrent, Pancreas Cancer, Stage IV Pancreatic Cancer, Stage 4 Pancreatic Cancer
Interventions
Melphalan, BCNU, Vitamin B12B, Vitamin C, Autologous Hematopoietic Stem Cells
Drug · Device
Lead sponsor
General Oncology, Inc.
Industry
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2028
U.S. locations
2
States / cities
Boston, Massachusetts • New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 29, 2026 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Phase 2 Interventional Results available

Males, Antioxidants, and Infertility Trial

NCT02421887
View directory record Official record
Conditions
Male Infertility
Interventions
Antioxidant Supplement, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
18 Years and older · Male only
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
10
States / cities
Los Angeles, California • San Francisco, California • Sunnyvale, California + 7 more
Source: ClinicalTrials.gov public record
Updated Sep 4, 2019 · Synced Oct 13, 2026, 9:08 AM EDT
Withdrawn Phase 2 Interventional

The Role of Antioxidant Supplementation in Keratoconus Patients

NCT02827747
View directory record Official record
Conditions
Keratoconus
Interventions
Antioxidants (Vitamins A,C,E) plus GSH, Placebo, Centrum, Dietary Sources
Other · Dietary Supplement · Combination Product
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 45 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Palm Beach Gardens, Florida
Source: ClinicalTrials.gov public record
Updated Aug 16, 2021 · Synced Oct 13, 2026, 9:08 AM EDT
Terminated Phase 1Phase 2 Interventional Results available

Research Study of IV Vitamin C in Combination With Irinotecan vs Irinotecan Alone for Advanced Colorectal CA

NCT01550510
View directory record Official record
Conditions
Stage IV Colorectal Cancer
Interventions
Ascorbic Acid, Irinotecan
Drug
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 6, 2025 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin C on Endothelial Function and Exercise Capacity in Fontan-Palliated Patients

NCT00974025
View directory record Official record
Conditions
Fontan Procedure, Hypoplastic Left Heart Syndrome, Tricuspid Atresia
Interventions
Vitamin C, Placebo
Dietary Supplement
Lead sponsor
University of Michigan
Other
Eligibility
8 Years to 25 Years
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jun 1, 2017 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Cystic Fibrosis and Endothelial Function: At Rest and During Exercise

NCT01772758
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
BH4 5mg, BH4 20mg, Antioxidant Cocktail
Drug · Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
7 Years and older
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 20, 2019 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Folic Acid for Vascular Outcome Reduction In Transplantation (FAVORIT)

NCT00064753
View directory record Official record
Conditions
Chronic Kidney Disease, Cardiovascular Disease, Death
Interventions
High Dose Multivitamin, Low Dose Multivitamin
Drug · Device
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
35 Years to 75 Years
Enrollment
4,110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2011
U.S. locations
27
States / cities
Birmingham, Alabama • Phoenix, Arizona • Los Angeles, California + 22 more
Source: ClinicalTrials.gov public record
Updated Oct 18, 2017 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional Results available

Glutathione Metabolism in Adolescents With Type 1 Diabetes - Study B

NCT00858273
View directory record Official record
Conditions
Diabetes Mellitus, Type 1
Interventions
Antioxidant supplement, Diabetes treatment, Regular Insulin
Dietary Supplement · Other · Drug
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
12 Years to 21 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated May 17, 2023 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating Whole Foods Supplementation on Cognition

NCT01672359
View directory record Official record
Conditions
Sub-optimal Cognitive Function, Sub-optimal Immune Function
Interventions
Ginkgo Synergy® and Choline, OPC Synergy® and Catalyn, Placebo
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
60 Years and older
Enrollment
97 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Aug 6, 2014 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional

The Effects of a High Protein Diet on Microbiota, Gastrointestinal Function and Wellness in Older Women

NCT02445560
View directory record Official record
Conditions
Aging
Interventions
Probiotic capsule and Fiber Sachet, Probiotic capsule and Placebo sachet, Placebo capsule and Fiber Sachet, Placebo capsule and Placebo sachet
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
65 Years and older · Female only
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015
U.S. locations
2
States / cities
Gainesville, Florida • Ocala, Florida
Source: ClinicalTrials.gov public record
Updated Mar 29, 2018 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Phase 1 Interventional

Gemcitabine, Ascorbate, Radiation Therapy for Pancreatic Cancer, Phase I

NCT01852890
View directory record Official record
Conditions
Pancreatic Neoplasms
Interventions
Ascorbate, Gemcitabine, Radiation therapy
Drug · Radiation
Lead sponsor
Joseph J. Cullen
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2025
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Oct 24, 2025 · Synced Oct 13, 2026, 9:08 AM EDT
Active, not recruiting Phase 2 Interventional

A Phase 2 Trial of High-Dose Ascorbate in Glioblastoma Multiforme

NCT02344355
View directory record Official record
Conditions
Glioblastoma Multiforme
Interventions
Temozolomide, radiation therapy, Ascorbic Acid
Drug · Radiation
Lead sponsor
Bryan Allen
Other
Eligibility
18 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2028
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Sep 30, 2026 · Synced Oct 13, 2026, 9:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Acute Study on Muscle Soreness, Damage, and Performance

NCT04230226
View directory record Official record
Conditions
Soreness, Muscle, Performance Enhancing Product Use, Damage Muscle
Interventions
Pre-workout plus and protein recovery plus, Placebo
Dietary Supplement · Other
Lead sponsor
Pharmanex
Industry
Eligibility
25 Years to 50 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 17, 2020 · Synced Oct 13, 2026, 9:08 AM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

Hookah Smoking, Carbon Monoxide, and Coronary Endothelial Function

NCT03166787
View directory record Official record
Conditions
Smoking, Endothelial Dysfunction
Interventions
Charcoal hookah, E-coal hookah, Cigarette, Carbon Monoxide inhalation, Room Air inhalation, vitamin C, tadalafil
Other · Drug
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
21 Years to 49 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 9, 2021 · Synced Oct 13, 2026, 9:08 AM EDT