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ClinicalTrials.gov public records Last synced Oct 13, 2026, 5:15 PM EDT

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Showing 193–216 of 368 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic Acid (Vitamin C) Clear all
Completed Not applicable Interventional

Evaluation of an Ayurvedic Herbal Compound Compared to Vitamins C+E and Placebo on Vascular Function in High-Risk Subjects

NCT07206901
View directory record Official record
Conditions
Coronary Artery Disease
Interventions
Maharishi Amrit Kalash, vitamin C + E, Inert Placebo Capsule
Dietary Supplement · Other
Lead sponsor
Maharishi International University
Other
Eligibility
55 Years to 90 Years
Enrollment
143 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2014
U.S. locations
1
States / cities
Fairfield, Iowa
Source: ClinicalTrials.gov public record
Updated Oct 3, 2025 · Synced Oct 13, 2026, 5:15 PM EDT
Recruiting Phase 2 Interventional

Intravenous Ascorbate Plus Gemcitabine/Carboplatin: A Novel and Cost-Effective Alternative With Evident Efficacy in Patients With Muscle Invasive Bladder Cancer

NCT06493370
View directory record Official record
Conditions
Bladder Cancer
Interventions
Intravenous ascorbic acid/vitamin C
Drug
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2030
U.S. locations
2
States / cities
Iowa City, Iowa • Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Feb 20, 2025 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Phase 2 Interventional Results available

ERG/5-HTP in Fragile X Syndrome (FXS)

NCT05030129
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
5-Hydroxytryptophan, Ergoloid Mesylates, Matching placebo for Ergoloid mesylates, Matching placebo for 5-Hydroxytryptophan
Drug
Lead sponsor
Elizabeth Berry-Kravis
Other
Eligibility
18 Years to 45 Years · Male only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 19, 2024 · Synced Oct 13, 2026, 5:15 PM EDT
Active, not recruiting Phase 2 Interventional Results available

A Phase 2 Study Adding Ascorbate to Chemotherapy and Radiation Therapy for NSCLC

NCT02905591
View directory record Official record
Conditions
Carcinoma, Non-Small-Cell Lung, Non-Small Cell Lung Cancer, Nonsmall Cell Lung Cancer, Non-Small-Cell Lung Carcinoma, NSCLC
Interventions
Radiation Therapy, Paclitaxel, Carboplatin, Ascorbic Acid
Drug
Lead sponsor
Joseph J. Cullen, MD, FACS
Other
Eligibility
18 Years and older
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2027
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jul 31, 2026 · Synced Oct 13, 2026, 5:15 PM EDT
Suspended Phase 2 Interventional

Reducing Frailty for Older Cancer Survivors Using Supplements II

NCT06068543
View directory record Official record
Conditions
Frailty, Inflammation
Interventions
Epigallocatechin-3-Gallate (EGCG), Microcrystalline cellulose (MCC), Ascorbic Acid (Vitamin C)
Drug · Dietary Supplement
Lead sponsor
University of Rochester
Other
Eligibility
65 Years and older
Enrollment
118 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2030
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Jun 26, 2026 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Hesperidin and Bone Health in Postmenopausal Women

NCT01881204
View directory record Official record
Conditions
Osteoporosis, Postmenopausal
Interventions
Hesperidin and Calcilock, Hesperidin, Control
Dietary Supplement
Lead sponsor
Purdue University
Other
Eligibility
Female only
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 17, 2018 · Synced Oct 13, 2026, 5:15 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Developing a Nutritional Supplement to Increase Collagen Synthesis in People

NCT06138106
View directory record Official record
Conditions
Dietary Supplements, Connective Tissue, Exercise
Interventions
Natural Product Supplement, Placebo control
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 30 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Jun 29, 2026 · Synced Oct 13, 2026, 5:15 PM EDT
Terminated Phase 2 Interventional Results available

Assessing the Efficacy and Safety of IV Vitamin C in Combination With Standard Chemotherapy for Pancreatic Ca

NCT01555489
View directory record Official record
Conditions
Stage IV Pancreatic Cancer
Interventions
Ascorbic Acid
Drug
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 4, 2025 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Not applicable Interventional

Vitamin C and Cardiovascular Risk

NCT00534014
View directory record Official record
Conditions
Atherosclerosis, Type 2 Diabetes
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
University of New Mexico
Other
Eligibility
18 Years to 75 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Mar 12, 2024 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Not applicable Interventional

Open Label Clinical Trial of Vascanox® HP on Nitric Oxide and Blood Pressure

NCT05928676
View directory record Official record
Conditions
Hypertension, Elevated Blood Pressure
Interventions
Vascanox® HP
Dietary Supplement
Lead sponsor
Calroy Health Sciences
Industry
Eligibility
25 Years to 80 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 2, 2023 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Not applicable Interventional

Diabetes Visual Function Supplement Study

NCT01646047
View directory record Official record
Conditions
Diabetes Mellitus - Type 1, Diabetes Mellitus - Type 2, Non-proliferative Diabetic Retinopathy
Interventions
multi-component nutritional supplement capsules, multi-component dietary supplement
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Jan 22, 2015 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Phase 2 Interventional Results available

Acetaminophen and Ascorbate in Sepsis: Targeted Therapy to Enhance Recovery

NCT04291508
View directory record Official record
Conditions
Acute Respiratory Distress Syndrome, Critical Illness, Respiratory Failure, Sepsis
Interventions
Intravenous Acetaminophen (room temperature), Intravenous Vitamin C (refrigerated), 5% Dextrose (room temperature), 5% Dextrose refrigerated
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
488 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
41
States / cities
Birmingham, Alabama • Tucson, Arizona • Fresno, California + 34 more
Source: ClinicalTrials.gov public record
Updated Sep 27, 2024 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Phase 2 Interventional Results available

SAFEty Study of Early Infusion of Vitamin C for Treatment of Novel Coronavirus Acute Lung Injury (SAFE EVICT CORONA-ALI)

NCT04344184
View directory record Official record
Conditions
COVID-19, Lung Injury, Acute, Kidney Injury
Interventions
L-ascorbic acid, Placebo
Drug · Other
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 4, 2024 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Phase 2 Interventional Results available

Fixed Dose Flavonoid Isoquercetin on Thrombo-Inflammatory Biomarkers in Subjects With Stable Sickle Cell Disease

NCT04514510
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Isoquercetin, Placebo
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
18 Years to 70 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 2, 2024 · Synced Oct 13, 2026, 5:15 PM EDT
Withdrawn Not applicable Interventional

Single Center Comparison of 4 FDA Approved, Commercially Available Bowel Purgatives for Colonoscopy

NCT02124447
View directory record Official record
Conditions
Patients Undergoing Screening or Surveillance Colonoscopy
Interventions
PEG+E, PEG+Asc, P+MC, sulfate
Drug
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years to 90 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 10, 2015 · Synced Oct 13, 2026, 5:15 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 14, 2006 · Synced Oct 13, 2026, 5:15 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

The Effects of Vitamin E and Vitamin C and Exercise

NCT01369043
View directory record Official record
Conditions
Exercise and Non-exercise Effect Upon Vitamins E and C
Interventions
Vitamin E and Vitamin C
Dietary Supplement
Lead sponsor
USDA Grand Forks Human Nutrition Research Center
Federal
Eligibility
30 Years to 50 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Grand Forks, North Dakota
Source: ClinicalTrials.gov public record
Updated Mar 9, 2015 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Collagen Vitamin C Dose Response Performance

NCT03293004
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Hydrolyzed collagen, Vitamin C, Optimized Hydrolyzed Collagen and Vitamin C, Gummy Placebo
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 25 Years · Male only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Aug 21, 2018 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Not applicable Interventional Results available

Famine From Feast: Linking Vitamin C, Red Blood Cell Fragility, and Diabetes

NCT02107976
View directory record Official record
Conditions
Diabetes Type 2
Interventions
Vitamin E, Vitamin C
Dietary Supplement
Lead sponsor
National Institutes of Health Clinical Center (CC)
NIH
Eligibility
18 Years to 65 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated May 12, 2026 · Synced Oct 13, 2026, 5:15 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 13, 2026, 5:15 PM EDT
Withdrawn Phase 2 Interventional

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

NCT00112879
View directory record Official record
Conditions
Stage I Multiple Myeloma, Stage II Multiple Myeloma, Stage III Multiple Myeloma, Refractory Plasma Cell Neoplasm
Interventions
arsenic trioxide, ascorbic acid, dexamethasone, thalidomide, anti-cytokine therapy, antiangiogenesis therapy, biological therapy, chemotherapy, drug resistance inhibition, growth factor antagonist therapy, non-specific immune-modulator therapy
Drug · Procedure
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 10, 2013 · Synced Oct 13, 2026, 5:15 PM EDT
Completed Not applicable Interventional Results available

Vitamin C Supplementation Intervention

NCT04036110
View directory record Official record
Conditions
Heart Failure
Interventions
Vitamin C 500 mg, Vitamin C 1000 mg, Placebo
Dietary Supplement · Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 99 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 9, 2021 · Synced Oct 13, 2026, 5:15 PM EDT
Recruiting No phase listed Observational

Transduction of Sympathetic Neural Activity in Human Obesity Without Hypertension

NCT06626113
View directory record Official record
Conditions
Obesity
Interventions
ascorbic acid
Drug
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years to 79 Years
Enrollment
60 participants
Timeline
2022 – 2027
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Oct 3, 2024 · Synced Oct 13, 2026, 5:15 PM 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 Dec 1, 2022 · Synced Oct 13, 2026, 5:15 PM EDT