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Showing 1–24 of 262 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: L-ascorbic acid Clear all
Completed Phase 1 Interventional

The Body's Affect on Vitamin C

NCT00001309
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Vitamin C
Other
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years to 35 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 2019
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 30, 2026 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Phase 2 Interventional Results available

Pharmacological Ascorbate for Lung Cancer

NCT02420314
View directory record Official record
Conditions
Carcinoma, Non-Small-Cell Lung
Interventions
Paclitaxel, Carboplatin, Ascorbic Acid
Drug
Lead sponsor
Joseph J. Cullen, MD, FACS
Other
Eligibility
18 Years and older
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2022
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Aug 19, 2024 · Synced Sep 5, 2026, 7:15 PM EDT
Terminated Phase 2 Interventional Results available

High Dose Intravenous Ascorbic Acid in Severe Sepsis

NCT02734147
View directory record Official record
Conditions
Sepsis
Interventions
Ascorbic Acid, Normal Saline
Drug · Other
Lead sponsor
Christiana Care Health Services
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Newark, Delaware
Source: ClinicalTrials.gov public record
Updated Feb 15, 2021 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Echinacea, Propolis and Vitamin C for URI Prevention in Preschoolers

NCT00231218
View directory record Official record
Conditions
Common Cold, Gastroenteritis
Interventions
dietary supplement--echinacea, propolis, and vitamin c
Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
3 Years to 6 Years
Enrollment
104 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 13, 2006 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Phase 3 Interventional Results available

Vitamin C, Thiamine, and Steroids in Sepsis

NCT03509350
View directory record Official record
Conditions
Sepsis
Interventions
Vitamin C, Thiamine, Hydrocortisone, Vitamin C Placebo, Thiamine Placebo, Hydrocortisone Placebo
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
501 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
43
States / cities
Phoenix, Arizona • Tucson, Arizona • Los Angeles, California + 30 more
Source: ClinicalTrials.gov public record
Updated Apr 12, 2021 · Synced Sep 5, 2026, 7:15 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 22, 2026 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Not applicable Interventional

Effect of Vitamin D Supplementation on Hemoglobin A1c in Patients With Uncontrolled Type 2 Diabetes Mellitus

NCT00985361
View directory record Official record
Conditions
Type 2 Diabetes Mellitus
Interventions
Vitamin D3 2000 international units daily, Vitamin C 500mg daily
Dietary Supplement
Lead sponsor
ProMedica Health System
Other
Eligibility
21 Years to 75 Years
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
3
States / cities
Sylvania, Ohio • Toledo, Ohio
Source: ClinicalTrials.gov public record
Updated May 5, 2010 · Synced Sep 5, 2026, 7:15 PM EDT
Terminated Phase 1 Interventional

Trisenox, Ascorbic Acid and Bortezomib in Patients With Relapsed/Refractory Multiple Myeloma

NCT00590603
View directory record Official record
Conditions
Multiple Myeloma
Interventions
Arsenic Trioxide, Ascorbic Acid and Bortezomib
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 7, 2014 · Synced Sep 5, 2026, 7:15 PM EDT
Terminated Phase 2 Interventional

Arsenic Trioxide, Thalidomide, Dexamethasone, and Ascorbic Acid in Treating Patients With Relapsed or Refractory Multiple Myeloma

NCT00227682
View directory record Official record
Conditions
Multiple Myeloma and Plasma Cell Neoplasm
Interventions
ascorbic acid, arsenic trioxide, dexamethasone, thalidomide
Dietary Supplement · Drug
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2006
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated May 27, 2012 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Phase 1 Interventional

Nitrite Infusion Studies

NCT00102271
View directory record Official record
Conditions
Healthy
Interventions
Oxypurinol, Sodium Nitrite
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
21 Years to 40 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2011
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Phase 2 Interventional Results available

Vitamin C Infusion for TReatment in Sepsis and Alcoholic Hepatitis

NCT03829683
View directory record Official record
Conditions
Alcoholic Hepatitis, Sepsis
Interventions
Vitamin C, Dextrose 5% in water
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Aug 27, 2023 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Investigating the Wrinkle Reduction Potential of a Novel Compounded Skin Care Cream

NCT03878381
View directory record Official record
Conditions
Skin Care
Interventions
Skin Care Cream, Placebo
Combination Product · Drug
Lead sponsor
Wayne State University
Other
Eligibility
20 Years to 60 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Dearborn, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 31, 2022 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Vitamin C on Iron Absorption

NCT00570895
View directory record Official record
Conditions
Iron Deficiency
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
4 Years to 8 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 25, 2020 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Phase 4 Interventional Results available

Study of High Dose Vitamin C On Outcome in Cardiac Surgery Patients

NCT01167569
View directory record Official record
Conditions
Reperfusion Injury
Interventions
Ascorbic Acid, 5 % Dextrose Water or Normal Saline
Drug · Other
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2013
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Oct 18, 2020 · Synced Sep 5, 2026, 7:15 PM EDT
Withdrawn Phase 2 Interventional

Study of High Dose Intravenous (IV) Ascorbic Acid in Measurable Solid Tumor Disease

NCT01125449
View directory record Official record
Conditions
Sarcoma, Adenocarcinoma, Carcinoma, Multiple Myeloma, Desmoplastic Small Round Cell Tumor
Interventions
Ascorbic acid (vitamin C)
Drug
Lead sponsor
Situs Cancer Research Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Rogers, Arkansas
Source: ClinicalTrials.gov public record
Updated May 17, 2025 · Synced Sep 5, 2026, 7:15 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 1, 2021 · Synced Sep 5, 2026, 7:15 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 23, 2019 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Phase 2 Interventional Results available

Therapeutic Use of Intravenous Vitamin C in Allogeneic Stem Cell Transplant Recipients

NCT03613727
View directory record Official record
Conditions
Lymphoid Leukemia, Myeloid Leukemia, Monocytic Leukemia, Myelodysplasia
Interventions
Intravenous (IV) and oral Vitamin C
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 77 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Nov 6, 2023 · Synced Sep 5, 2026, 7:15 PM EDT
Terminated Not applicable Interventional

Hyperglycemia and Oxidative Stress in the Human Brain With Diabetes

NCT00775541
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
In-Young Choi, Ph.D.
Other
Eligibility
30 Years to 55 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 17, 2012 · Synced Sep 5, 2026, 7:15 PM EDT
Recruiting Phase 2 Interventional

Ascorbate in Myelodysplastic Syndrome

NCT07283900
View directory record Official record
Conditions
Myelodysplastic Syndromes
Interventions
High-dose ascorbate, Azacitidine
Drug
Lead sponsor
Prajwal Dhakal
Other
Eligibility
18 Years to 99 Years
Enrollment
38 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 Mar 15, 2026 · Synced Sep 5, 2026, 7:15 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 7, 2026 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Broccoli Sulforaphane Bioavailability With Mustard

NCT04946526
View directory record Official record
Conditions
Sulforaphane Bioavailability
Interventions
Broccoli seed extract, Broccoli seed extract with mustard seed powder
Dietary Supplement
Lead sponsor
Appalachian State University
Other
Eligibility
25 Years to 65 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Kannapolis, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 24, 2023 · Synced Sep 5, 2026, 7:15 PM EDT
Completed No phase listed Observational

Outcomes of Septic Shock Patients Treated With a Metabolic Resuscitation Bundle Consisting of Intravenous Hydrocortisone, Ascorbic Acid and Thiamine.

NCT03913468
View directory record Official record
Conditions
Septic Shock, Ascorbic Acid Deficiency
Interventions
Intravenous Ascorbic Acid
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 90 Years
Enrollment
206 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 13, 2021 · Synced Sep 5, 2026, 7:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Bioequivalence Study on Vitamin C in Healthy Adults

NCT03562988
View directory record Official record
Conditions
Dietary Exposure
Interventions
Vitamin C gummy, Vitamin C tablet
Dietary Supplement
Lead sponsor
Church & Dwight Company, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Princeton, New Jersey
Source: ClinicalTrials.gov public record
Updated Aug 22, 2021 · Synced Sep 5, 2026, 7:15 PM EDT