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ClinicalTrials.gov public records Last synced Oct 10, 2026, 5:07 PM EDT

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Showing 49–72 of 137 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin C 500 mg Clear all
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 10, 2026, 5:07 PM EDT
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 – 2027
U.S. locations
1
States / cities
Carlsbad, California
Source: ClinicalTrials.gov public record
Updated Oct 5, 2026 · Synced Oct 10, 2026, 5:07 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 3, 2025 · Synced Oct 10, 2026, 5:07 PM EDT
Completed Phase 1 Interventional

Decitabine, Arsenic Trioxide and Ascorbic Acid for Myelodysplastic Syndromes and Acute Myeloid Leukemia

NCT00671697
View directory record Official record
Conditions
Myelodysplastic Syndromes and Leukemia, Myeloid, Acute
Interventions
Arsenic Trioxide, Decitabine
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 4, 2013 · Synced Oct 10, 2026, 5:07 PM 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 10, 2026, 5:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Bioavailability and Pharmacokinetics of Mango

NCT03365739
View directory record Official record
Conditions
Healthy Subjects
Interventions
Active Comparator 1, Active Comparator 2, Control Comparator
Dietary Supplement
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
20 Years to 45 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 14, 2020 · Synced Oct 10, 2026, 5:07 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 17, 2021 · Synced Oct 10, 2026, 5:07 PM EDT
Terminated Phase 2 Interventional Results available

Trial of Arsenic Trioxide With Ascorbic Acid in the Treatment of Adult Non-Acute Promyelocytic Leukemia (APL) Acute Myelogenous Leukemia

NCT00184054
View directory record Official record
Conditions
Acute Myelogenous Leukemia
Interventions
Arsenic Trioxide (ATO), Ascorbic Acid
Drug
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2011
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jul 25, 2014 · Synced Oct 10, 2026, 5:07 PM EDT
Withdrawn Phase 2 Interventional

A Clinical Trial Evaluating the Effect of Pharmacological Ascorbate on Radiation Therapy for Pancreatic Cancer Patients

NCT03541486
View directory record Official record
Conditions
Pancreatic Neoplasm
Interventions
Ascorbate, Gemcitabine, radiation therapy
Drug · Radiation
Lead sponsor
Joseph J. Cullen, MD, FACS
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2030
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Mar 10, 2025 · Synced Oct 10, 2026, 5:07 PM EDT
Withdrawn Early Phase 1 Interventional

Gemcitabine With Ascorbate Including Adolescents

NCT04877587
View directory record Official record
Conditions
Soft Tissue Sarcoma, Bone Sarcoma, Unresectable Soft Tissue Sarcoma, Metastatic Bone Sarcoma, Metastatic Soft-tissue Sarcoma, Unresectable Bone Sarcoma
Interventions
Ascorbate, Gemcitabine
Drug
Lead sponsor
David Dickens
Other
Eligibility
13 Years to 17 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Feb 22, 2023 · Synced Oct 10, 2026, 5:07 PM EDT
Terminated Phase 1 Interventional Results available

High Dose Vitamin C in Cardiac Surgery Patients

NCT02762331
View directory record Official record
Conditions
Disorder of Vitamin C, Atrial Fibrillation, Complications Due to Coronary Artery Bypass Graft, Heart Valve Disease
Interventions
Ascorbic Acid, Placebo
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 70 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jun 24, 2019 · Synced Oct 10, 2026, 5:07 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 10, 2026, 5:07 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
Copenhagen University Hospital, Rigshospitalet
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 17, 2024 · Synced Oct 10, 2026, 5:07 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 23, 2026 · Synced Oct 10, 2026, 5:07 PM EDT
Terminated Phase 2 Interventional Results available

Clinical Trial of High-dose Vitamin C for Advanced Pancreatic Cancer

NCT01515046
View directory record Official record
Conditions
Pancreatic Neoplasms, Pancreatic Cancer
Interventions
Gemcitabine with escalating ascorbic acid
Drug
Lead sponsor
Joseph J. Cullen
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jun 8, 2017 · Synced Oct 10, 2026, 5:07 PM EDT
Completed Phase 1 Interventional

Vitamin C in Cardiac Surgery Patients

NCT03123107
View directory record Official record
Conditions
Coronary Artery Bypass Graft Surgery
Interventions
Ascorbic Acid
Drug
Lead sponsor
Geisinger Clinic
Other
Eligibility
21 Years to 79 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Wilkes-Barre, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 16, 2021 · Synced Oct 10, 2026, 5:07 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 10, 2026, 5:07 PM EDT
Recruiting Phase 1 Interventional

High-dose Ascorbate (HDA) in Combination With Standard of Care Azacitidine and Venetoclax in Acute Myeloid Leukemia (AML)

NCT07177079
View directory record Official record
Conditions
Acute Myeloid Leukemia
Interventions
Azacitidine, Venetoclax, High-dose ascorbate, Decitabine
Drug
Lead sponsor
Kittika Poonsombudlert
Other
Eligibility
18 Years to 75 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Oct 10, 2026, 5:07 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 10, 2026, 5:07 PM EDT
Completed Not applicable Interventional

Effect of Supplement on Appetite and GLP-1

NCT06790771
View directory record Official record
Conditions
Hunger
Interventions
High Dose Supplement, Low Dose Supplement, Placebo
Dietary Supplement
Lead sponsor
Texas Christian University
Other
Eligibility
18 Years to 60 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Fort Worth, Texas
Source: ClinicalTrials.gov public record
Updated May 28, 2026 · Synced Oct 10, 2026, 5:07 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 10, 2026, 5:07 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Antenatal Micronutrient Supplementation and Infant Survival

NCT00860470
View directory record Official record
Conditions
Infant Mortality, Preterm Birth, Low Birth Weight, Neonatal Mortality, Perinatal Mortality
Interventions
Iron (27 mg) - folic acid (600 ug), Multiple micronutrient
Dietary Supplement
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
12 Years to 45 Years · Female only
Enrollment
44,567 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 19, 2022 · Synced Oct 10, 2026, 5:07 PM EDT
Completed Phase 2Phase 3 Interventional

High Dose Ascorbic Acid Treatment of CMT1A

NCT00484510
View directory record Official record
Conditions
Charcot-Marie-Tooth Disease, Type Ia
Interventions
Ascorbic acid (Vitamin C), placebo
Drug
Lead sponsor
Wayne State University
Other
Eligibility
13 Years to 70 Years
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
3
States / cities
Baltimore, Maryland • Detroit, Michigan • Rochester, New York
Source: ClinicalTrials.gov public record
Updated Mar 6, 2013 · Synced Oct 10, 2026, 5:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Treatment of Non-Anemic Iron Deficiency in Pregnancy

NCT05423249
View directory record Official record
Conditions
Non-anemic Iron Deficiency
Interventions
Ferrous sulfate, Prenatal, Docusate Sodium, Ascorbic Acid 500Mg Tab, Placebo
Drug
Lead sponsor
Stony Brook University
Other
Eligibility
18 Years to 55 Years · Female only
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
3
States / cities
Bohemia, New York • Commack, New York • East Setauket, New York
Source: ClinicalTrials.gov public record
Updated Nov 29, 2024 · Synced Oct 10, 2026, 5:07 PM EDT