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ClinicalTrials.gov public records Last synced Oct 7, 2026, 7:21 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 1–24 of 367 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic Acid (Vitamin C) Clear all
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 7, 2026, 7:21 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Local Antioxidant Therapy Vasoconstriction Effects in Different Races

NCT03684213
View directory record Official record
Conditions
Cardiovascular Diseases, Cardiovascular Risk Factor, Vasoconstriction
Interventions
Control (Norepinephrine), Norepinephrine + Ascorbic Acid, Norepinephrine + L-NAME, Norepinephrine + L-NAME + Ascorbic Acid
Drug
Lead sponsor
The University of Texas at Arlington
Other
Eligibility
18 Years to 35 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Arlington, Texas
Source: ClinicalTrials.gov public record
Updated Jun 11, 2024 · Synced Oct 7, 2026, 7:21 AM EDT
Completed Phase 2 Interventional Results available

Tetrahydrobiopterin in Patients With Chronic Kidney Disease (CKD) and Albuminuria

NCT00625820
View directory record Official record
Conditions
Kidney Disease, Albuminuria
Interventions
6R BH4, Vitamin C
Drug · Dietary Supplement
Lead sponsor
University of Michigan
Other
Eligibility
18 Years to 75 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 18, 2016 · Synced Oct 7, 2026, 7:21 AM EDT
Recruiting Not applicable Interventional

Effect of Watermelon on Gut and Cardiometabolic Health

NCT06588218
View directory record Official record
Conditions
Obesity and Overweight, Dysbiosis
Interventions
Watermelon, Belvita Breakfast Sandwich + 12 oz Water
Other
Lead sponsor
Florida State University
Other
Eligibility
18 Years to 30 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Apr 9, 2026 · Synced Oct 7, 2026, 7:21 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Hydrolyzed Collagen and Vitamin C on Explosive Performance

NCT04437758
View directory record Official record
Conditions
Collagen Synthesis, Rate of Force (RFD) Development
Interventions
Collagen and Vitamin C powder mix nutritional intervention, Maltodextrin placebo powder, Maximum power training exercise
Dietary Supplement · Other
Lead sponsor
PepsiCo Global R&D
Industry
Eligibility
18 Years to 30 Years · Male only
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Jun 18, 2020 · Synced Oct 7, 2026, 7:21 AM 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 7, 2026, 7:21 AM EDT
Withdrawn Phase 2 Interventional

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

NCT00085345
View directory record Official record
Conditions
Stage II Multiple Myeloma, Stage III Multiple Myeloma, Refractory Plasma Cell Neoplasm
Interventions
arsenic trioxide, ascorbic acid, melphalan, chemosensitization/potentiation, chemotherapy
Drug · Procedure
Lead sponsor
Oncotherapeutics
Industry
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
19
States / cities
Glendale, Arizona • Bakersfield, California • Campbell, California + 16 more
Source: ClinicalTrials.gov public record
Updated Jul 10, 2013 · Synced Oct 7, 2026, 7:21 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Studying the Impact of Product Packaging in a Virtual Store Environment

NCT04381481
View directory record Official record
Conditions
Obesity, Childhood
Interventions
Experimental Drink: Nutrition claim on fruit drinks, Control Drink: No nutrition claim, Experimental snack: Text warning, Experimental snack: Graphic warning, Control snack: barcode label
Behavioral
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 99 Years
Enrollment
2,374 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 18, 2021 · Synced Oct 7, 2026, 7:21 AM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

A Study to Assess the Impact of a Nutritional Supplement on Wellbeing and Nutrient Absorption

NCT06749808
View directory record Official record
Conditions
Nutrition Status
Interventions
Carotenoid Nutritional Supplement, Placebo
Dietary Supplement
Lead sponsor
Pharmanex
Industry
Eligibility
20 Years to 65 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Provo, Utah
Source: ClinicalTrials.gov public record
Updated Dec 31, 2024 · Synced Oct 7, 2026, 7:21 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Placebo-Controlled Study Assessing the Use of a Novel Exfoliative Serum With A Chemical Peel to Improve Photodamage in Adults

NCT05908825
View directory record Official record
Conditions
Photodamaged Skin
Interventions
Vitamin C with AHA Exfoliative Serum, Placebo serum
Drug
Lead sponsor
Austin Institute for Clinical Research
Network
Eligibility
30 Years to 65 Years · Female only
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Pflugerville, Texas
Source: ClinicalTrials.gov public record
Updated Jul 19, 2024 · Synced Oct 7, 2026, 7:21 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 10, 2022 · Synced Oct 7, 2026, 7:21 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of a Nitric Oxide Supplementation Product on Endothelial Dysfunction and Prehypertensive Adults

NCT03895749
View directory record Official record
Conditions
Hypertension
Interventions
NEO40 Daily
Dietary Supplement
Lead sponsor
Hypertension Institute, Nashville
Other
Eligibility
18 Years to 75 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 30, 2019 · Synced Oct 7, 2026, 7:21 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 7, 2026, 7:21 AM EDT
Completed Phase 2 Interventional

Antioxidant Therapy in Lean and Obese Asthmatics

NCT01317563
View directory record Official record
Conditions
Asthma
Interventions
Vitamins A, E, C & Selenium, Placebo
Dietary Supplement
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
12 Years to 25 Years
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2016
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 22, 2016 · Synced Oct 7, 2026, 7:21 AM 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 7, 2026, 7:21 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of a Topical Cosmetic Product on Women's Hair

NCT06060834
View directory record Official record
Conditions
Hair Thinning, Hair Loss
Interventions
Topical Botanical Agent
Dietary Supplement
Lead sponsor
University of Memphis
Other
Eligibility
35 Years to 70 Years · Female only
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 9, 2025 · Synced Oct 7, 2026, 7:21 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 7, 2026, 7:21 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 24, 2016 · Synced Oct 7, 2026, 7:21 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Probiotic Intake on Intestinal Permeability in Healthy Adults

NCT03611400
View directory record Official record
Conditions
Intestinal Barrier Function
Interventions
Probiotic, Placebo
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
21 Years to 50 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 21, 2019 · Synced Oct 7, 2026, 7:21 AM EDT
Completed Phase 2 Interventional Results available

Reducing Frailty for Older Cancer Survivors Using Supplements

NCT04553666
View directory record Official record
Conditions
Frailty, Inflammation
Interventions
Epigallocatechin-3-Gallate (EGCG) plus Ascorbic Acid (Vitamin C)
Drug
Lead sponsor
University of Rochester
Other
Eligibility
65 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Oct 7, 2026, 7:21 AM 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 26, 2020 · Synced Oct 7, 2026, 7:21 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Local Vasoconstriction in Postural Tachycardia Syndrome

NCT01210430
View directory record Official record
Conditions
Postural Tachycardia Syndrome
Interventions
Losartan, Ascorbic Acid (Vitamin C), Normal Saline
Drug
Lead sponsor
New York Medical College
Other
Eligibility
14 Years to 29 Years
Enrollment
74 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Hawthorne, New York
Source: ClinicalTrials.gov public record
Updated Jun 10, 2021 · Synced Oct 7, 2026, 7:21 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 7, 2026, 7:21 AM 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 18, 2025 · Synced Oct 7, 2026, 7:21 AM EDT