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ClinicalTrials.gov public records Last synced Sep 11, 2026, 10:27 PM EDT

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Showing 1–24 of 165 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo - ascorbic acid Clear all
Completed Not applicable Interventional Accepts healthy volunteers

TKA Melatonin and Sleep Quality

NCT05332717
View directory record Official record
Conditions
Arthroplasty, Replacement, Knee, Sleep Initiation and Maintenance Disorders
Interventions
Melatonin 5 mg, Placebo (Vitamin C)
Dietary Supplement
Lead sponsor
Hospital for Special Surgery, New York
Other
Eligibility
18 Years and older
Enrollment
176 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 13, 2023 · Synced Sep 11, 2026, 10:27 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 11, 2026, 10:27 PM EDT
Terminated Phase 1 Interventional Results available

Clinical Utility of Endothelial Dysfunction in PAD

NCT00491751
View directory record Official record
Conditions
Peripheral Arterial Disease
Interventions
atorvastatin, ascorbic acid, Placebo
Drug
Lead sponsor
Boston University
Other
Eligibility
18 Years and older
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 26, 2018 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Early Phase 1 Interventional Results available

Treatment of HFpEF With Nitrate Supplement

NCT03289481
View directory record Official record
Conditions
Heart Failure With Normal Ejection Fraction
Interventions
Active lozenge, Placebo
Dietary Supplement · Drug
Lead sponsor
MaineHealth
Other
Eligibility
18 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Rockport, Maine
Source: ClinicalTrials.gov public record
Updated Oct 5, 2021 · Synced Sep 11, 2026, 10:27 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 11, 2026, 10:27 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin C on Endothelial Function and Exercise Capacity in Fontan-Palliated Patients

NCT00974025
View directory record Official record
Conditions
Fontan Procedure, Hypoplastic Left Heart Syndrome, Tricuspid Atresia
Interventions
Vitamin C, Placebo
Dietary Supplement
Lead sponsor
University of Michigan
Other
Eligibility
8 Years to 25 Years
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated May 31, 2017 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Phase 1 Interventional Results available

Beneficial Effects of Quercetin in Chronic Obstructive Pulmonary Disease (COPD)

NCT01708278
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
Quercetin, Placebo - sugar chew
Drug · Other
Lead sponsor
University of Michigan
Other
Eligibility
40 Years to 80 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Dec 25, 2016 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Not applicable Interventional

The Effect of Vitamin C on Wound Healing In Mandibular Fracture Patients

NCT03938584
View directory record Official record
Conditions
Vitamin C Deficiency, Smoking, Surgery, Surgery--Complications, Wound, Wound Complication, Wound Infection, Wound Dehiscence, Wound of Skin, Mandible Fracture, Mandible Open Fracture, Mandible Closed Fracture, Mandibular Fractures, Ascorbic Acid Deficiency, Oxidative Stress, Inflammation
Interventions
Vitamin C, Placebo
Dietary Supplement · Other
Lead sponsor
Hennepin Healthcare Research Institute
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 25, 2022 · Synced Sep 11, 2026, 10:27 PM EDT
Withdrawn Not applicable Interventional

Vitamin C & Exercise Induced Bronchoconstriction (EIB)

NCT03610932
View directory record Official record
Conditions
Exercise-induced Bronchospasm
Interventions
Vitamin C, Placebo
Dietary Supplement · Other
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Dec 12, 2019 · Synced Sep 11, 2026, 10:27 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 21, 2015 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

A Study Evaluating Quality of Life Parameters Following Use of Emergen-C

NCT06654089
View directory record Official record
Conditions
Dietary Supplements
Interventions
Emergen-C Core Super Orange Powder, Placebo
Dietary Supplement
Lead sponsor
HALEON
Industry
Eligibility
18 Years to 64 Years
Enrollment
299 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 6, 2026 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Phase 2 Interventional Results available

Vitamin C Infusion for Treatment in Sepsis Induced Acute Lung Injury

NCT02106975
View directory record Official record
Conditions
Acute Lung Injury, Sepsis
Interventions
Ascorbic Acid, Placebo: 5% Dextrose in water
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
170 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
5
States / cities
Atlanta, Georgia • Lexington, Kentucky • Cleveland, Ohio + 2 more
Source: ClinicalTrials.gov public record
Updated Oct 14, 2019 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Phase 2 Interventional Results available

Vitamin C & Thiamine to Treat Sepsis and Septic Shock

NCT03592277
View directory record Official record
Conditions
Sepsis, Septic Shock
Interventions
Vitamin C, Vitamin B1
Drug
Lead sponsor
Trinity Health Of New England
Other
Eligibility
18 Years to 90 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Sep 27, 2022 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Effect of Astaxanthin in Healthy Participants

NCT05376501
View directory record Official record
Conditions
Healthy
Interventions
Astaxanthin, Placebo
Dietary Supplement · Other
Lead sponsor
LycoRed Ltd.
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Richardson, Texas
Source: ClinicalTrials.gov public record
Updated Nov 30, 2022 · Synced Sep 11, 2026, 10:27 PM EDT
Withdrawn Phase 2 Interventional

The Role of Antioxidant Supplementation in Keratoconus Patients

NCT02827747
View directory record Official record
Conditions
Keratoconus
Interventions
Antioxidants (Vitamins A,C,E) plus GSH, Placebo, Centrum, Dietary Sources
Other · Dietary Supplement · Combination Product
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 45 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Palm Beach Gardens, Florida
Source: ClinicalTrials.gov public record
Updated Aug 15, 2021 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Exercise in Health and Chronic Obstructive Pulmonary Disease

NCT02300064
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
Knee-extensor exercise test, Exercise test with restricting/releasing blood flow, Exercise test with variable oxygen concentration and MRI, Exercise test with oral antioxidant or placebo cocktail
Other
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
185 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2016
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 31, 2016 · Synced Sep 11, 2026, 10:27 PM 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 11, 2026, 10:27 PM EDT
Completed Phase 1 Interventional

The Physiological Responses and Adaptation of Brown Adipose Tissue to Chronic Treatment With Beta3-Adrenergic Receptor Agonists

NCT03049462
View directory record Official record
Conditions
Polycystic Ovary Syndrome
Interventions
Mirabegron, B Complex Plus Vitamin C Tablets
Drug · Other
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years to 40 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2026
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 8, 2026 · Synced Sep 11, 2026, 10:27 PM EDT
Recruiting Phase 1Phase 2 Interventional

Sympathetic-vascular Dysfunction in Obesity and Insulin Resistance (Vitamin C Study)

NCT04715022
View directory record Official record
Conditions
Hypertension, Cardiovascular Diseases
Interventions
Ascorbic acid solution (American Regent Laboratories Inc.), Saline
Drug
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
35 Years to 65 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 7, 2025 · Synced Sep 11, 2026, 10:27 PM EDT
Terminated Phase 2 Interventional Results available

Docetaxel With or Without Ascorbic Acid in Treating Patients With Metastatic Prostate Cancer

NCT02516670
View directory record Official record
Conditions
Hormone-Resistant Prostate Cancer, Metastatic Prostate Carcinoma, Stage IV Prostate Cancer
Interventions
Ascorbic Acid, Docetaxel, Laboratory Biomarker Analysis, Pharmacological Study, Placebo, Quality-of-Life Assessment
Dietary Supplement · Drug · Other
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years and older · Male only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
6
States / cities
Washington D.C., District of Columbia • Annapolis, Maryland • Baltimore, Maryland + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 6, 2023 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Not applicable Interventional

Evaluation of Jarro-Dophilus EPS® Probiotic Formulations

NCT02693314
View directory record Official record
Conditions
Healthy
Interventions
Jarro-Dophilus EPS® (5 billion CFU/capsule), Jarro-Dophilus EPS® High Potency (25 billion CFU/capsule), Placebo
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 50 Years
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 22, 2018 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Hydroxychloroquine for COVID-19 Post-exposure Prophylaxis (PEP)

NCT04328961
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, SARS (Severe Acute Respiratory Syndrome), SARS-CoV-2
Interventions
Hydroxychloroquine Sulfate, Ascorbic Acid
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 80 Years
Enrollment
943 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
8
States / cities
Los Angeles, California • New Orleans, Louisiana • Baltimore, Maryland + 4 more
Source: ClinicalTrials.gov public record
Updated Dec 15, 2021 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Probiotic and Gastrointestinal Symptoms Due to Menstruation in Healthy Women

NCT04457401
View directory record Official record
Conditions
Menstrual Discomfort
Interventions
Probiotic, Placebo
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
187 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 27, 2024 · Synced Sep 11, 2026, 10:27 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Acute Study on Muscle Soreness, Damage, and Performance

NCT04230226
View directory record Official record
Conditions
Soreness, Muscle, Performance Enhancing Product Use, Damage Muscle
Interventions
Pre-workout plus and protein recovery plus, Placebo
Dietary Supplement · Other
Lead sponsor
Pharmanex
Industry
Eligibility
25 Years to 50 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 16, 2020 · Synced Sep 11, 2026, 10:27 PM EDT