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Showing 1–24 of 86 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Oral Ascorbic Acid Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

Safety and Immunogenicity of Peru-15-pCTB in Healthy Adult Subjects

NCT00654108
View directory record Official record
Conditions
Gastroenteritis Escherichia Coli
Interventions
Ciprofloxacin, Peru-15-pCTB, Sodium bicarbonate/Ascorbic Acid/Aspartame Buffer
Drug · Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 45 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 28, 2021 · Synced Sep 15, 2026, 6:12 AM EDT
Not yet recruiting Phase 1 Interventional

High-Dose Vitamin C in G6PDA and Pyruvate Kinase Deficiency: A Safety Study

NCT07612345
View directory record Official record
Conditions
Pyruvate Kinase Deficiency, Glucose 6 Phosphate Dehydrogenase Deficiency
Interventions
Vitamin C
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 15, 2026, 6:12 AM EDT
Terminated Phase 1 Interventional Results available

Temozolomide and Ascorbic Acid in Treating Patients With Recurrent High-Grade Glioma

NCT02168270
View directory record Official record
Conditions
Anaplastic Astrocytoma, Anaplastic Oligodendroglioma, Anaplastic Oligoastrocytoma, Glioblastoma, Gliosarcoma
Interventions
ascorbic acid, temozolomide, quality-of-life assessment, laboratory biomarker analysis
Dietary Supplement · Drug · Other
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Nov 23, 2023 · Synced Sep 15, 2026, 6:12 AM 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 28, 2013 · Synced Sep 15, 2026, 6:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Cervical Preparation Before Dilation and Evacuation

NCT01751087
View directory record Official record
Conditions
Abortion, Induced
Interventions
Mifepristone, misoprostol, Osmotic dilators, placebo
Other · Drug · Device
Lead sponsor
Planned Parenthood League of Massachusetts
Other
Eligibility
18 Years and older · Female only
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
7
States / cities
San Francisco, California • Chicago, Illinois • Boston, Massachusetts + 3 more
Source: ClinicalTrials.gov public record
Updated Feb 23, 2016 · Synced Sep 15, 2026, 6:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

RCT of an Oral Acne Supplement for Adult Women

NCT06097871
View directory record Official record
Conditions
Acne
Interventions
Skin Nutraceutical Supplement, Placebo pill
Dietary Supplement · Other
Lead sponsor
Nutraceutical Wellness Inc.
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
102 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
High Point, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 24, 2024 · Synced Sep 15, 2026, 6:12 AM 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 19, 2026 · Synced Sep 15, 2026, 6:12 AM EDT
Terminated Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Treatment for COVID-19 in High-Risk Adult Outpatients

NCT04354428
View directory record Official record
Conditions
COVID-19, SARS-CoV-2
Interventions
Ascorbic Acid, Hydroxychloroquine Sulfate, Azithromycin, Folic Acid, Lopinavir 200 MG / Ritonavir 50 MG [Kaletra]
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 80 Years
Enrollment
289 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
6
States / cities
Chicago, Illinois • New Orleans, Louisiana • Boston, Massachusetts + 2 more
Source: ClinicalTrials.gov public record
Updated Aug 7, 2022 · Synced Sep 15, 2026, 6:12 AM 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 9, 2022 · Synced Sep 15, 2026, 6:12 AM 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 15, 2026, 6:12 AM EDT
Withdrawn Not applicable Interventional

EoE Food Desensitization

NCT02881372
View directory record Official record
Conditions
Eosinophilic Esophagitis
Interventions
Oral food desensitization
Other
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
3 Years to 17 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 8, 2024 · Synced Sep 15, 2026, 6:12 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 19, 2019 · Synced Sep 15, 2026, 6:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Combinatorial Nutritional Supplementation on Immune Function in Healthy Older Adults

NCT02876315
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Redoxon VI, placebo
Dietary Supplement
Lead sponsor
Oregon State University
Other
Eligibility
55 Years to 75 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Corvallis, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 30, 2022 · Synced Sep 15, 2026, 6:12 AM 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 13, 2023 · Synced Sep 15, 2026, 6:12 AM EDT
Completed Phase 1 Interventional

Vitamin C Supplementation as a Preventive Treatment of Diabetic Peripheral Neuropathy

NCT00634998
View directory record Official record
Conditions
Diabetic Neuropathies
Interventions
Vitamin C, Placebo
Dietary Supplement
Lead sponsor
Washington State University
Other
Eligibility
50 Years to 70 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Spokane, Washington
Source: ClinicalTrials.gov public record
Updated Apr 26, 2023 · Synced Sep 15, 2026, 6:12 AM 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 15, 2026, 6:12 AM 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 10, 2017 · Synced Sep 15, 2026, 6:12 AM 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 25, 2021 · Synced Sep 15, 2026, 6:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Practicality of Intermittent Fasting and Its Effect on Markers of Aging and Oxidative Stress

NCT02132091
View directory record Official record
Conditions
Aging, Metabolism
Interventions
Intermittent Fasting, 400 IU Vitamin E, 1000 mg Vitamin C
Other · Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
19 Years to 30 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 13, 2015 · Synced Sep 15, 2026, 6:12 AM 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 15, 2026, 6:12 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Respiratory and Autonomic Plasticity Following Intermittent Hypoxia

NCT00860743
View directory record Official record
Conditions
Sleep Apnea Syndromes
Interventions
Antioxidant cocktail
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
20 Years to 40 Years
Enrollment
63 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2013
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 31, 2017 · Synced Sep 15, 2026, 6:12 AM EDT
Completed Phase 1Phase 2 Interventional Results available

A Phase Ib Study Evaluating the Safety and Tolerability of Vitamin C in Patients With Intermediate or High Risk Myelodysplastic Syndrome With TET2 Mutations

NCT03433781
View directory record Official record
Conditions
Myelodysplastic Syndromes
Interventions
Vitamin C
Drug
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
2
States / cities
Miami, Florida • New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 26, 2024 · Synced Sep 15, 2026, 6:12 AM 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 15, 2014 · Synced Sep 15, 2026, 6:12 AM 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 15, 2026, 6:12 AM EDT