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ClinicalTrials.gov public records Last synced Oct 13, 2026, 9:14 PM EDT

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Showing 337–360 of 368 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ascorbic Acid (Vitamin C) Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Bioavailability and Pharmacokinetics of Mango

NCT03365739
View directory record Official record
Conditions
Healthy Subjects
Interventions
Active Comparator 1, Active Comparator 2, Control Comparator
Dietary Supplement
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
20 Years to 45 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 14, 2020 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Effect of Funk It Cycle Bites on PMS

NCT05900024
View directory record Official record
Conditions
Premenstrual Syndrome
Interventions
Funk It Cycle Bites
Other
Lead sponsor
Funk It Wellness
Industry
Eligibility
18 Years to 40 Years · Female only
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Feb 29, 2024 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Micronutrients to Prevent Noise-induced Hearing Loss

NCT00808470
View directory record Official record
Conditions
Noise-Induced Hearing Loss
Interventions
beta-carotene, vitamins C and E, magnesium, Placebo
Drug · Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years to 35 Years
Enrollment
72 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2013
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 19, 2017 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Assessment of Gastric pH Changes Induced by Ascorbic Acid Tablets

NCT04199624
View directory record Official record
Conditions
Hypochlorhydria
Interventions
Omeprazole 20mg, Vitamin C
Drug · Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 30 Years · Male only
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Sep 22, 2025 · Synced Oct 13, 2026, 9:14 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

A Clinical Trial to Examine the Efficacy of a Supplement to Support Healthy Hair and Skin

NCT06579742
View directory record Official record
Conditions
Hair Thinning, Hair Loss
Interventions
Live Conscious Beyond Collagen, Placebo
Dietary Supplement
Lead sponsor
Scale Media Inc
Industry
Eligibility
40 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Aug 30, 2024 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Not applicable Interventional Results available

Does Vitamin C Reduce Finger Stiffness After Distal Radius Fractures?

NCT02216812
View directory record Official record
Conditions
Finger Stiffness, Distal Radius Fracture
Interventions
500 mg vitamin c, 1 pill per day for 6 weeks, 1 placebo pill for 6 weeks
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
134 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 14, 2019 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Phase 2Phase 3 Interventional

Integrative Medicine Approach to the Management of Asthma in Adults

NCT00843544
View directory record Official record
Conditions
Asthma
Interventions
Integrative Medicine
Behavioral
Lead sponsor
Beth Israel Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
156 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 13, 2009 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Ascorbic Acid, Corticosteroids, and Thiamine in Sepsis (ACTS) Trial

NCT03389555
View directory record Official record
Conditions
Sepsis, Septic Shock, Metabolic Disturbance
Interventions
vitamin C, vitamin B1, hydrocortisone, Normal saline
Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years and older
Enrollment
205 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
13
States / cities
Phoenix, Arizona • Boston, Massachusetts • Cambridge, Massachusetts + 6 more
Source: ClinicalTrials.gov public record
Updated Feb 16, 2021 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Phase 1 Interventional

Vitamin E Pharmacokinetics and Biomarkers in Normal and Obese Women

NCT00862433
View directory record Official record
Conditions
Diabetes, Fatty Liver, Obesity, Healthy Volunteers
Interventions
Alpha tocopherol, Vitamin E, Vitamin C
Drug · Other
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years to 55 Years · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2022
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 13, 2026 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Supplementary Vitamins on Oxidant Gene Expression in the Lungs of Healthy Smokers

NCT00565214
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease (COPD)
Interventions
Group 1, Group 2
Dietary Supplement
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years to 70 Years
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 25, 2017 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Not applicable Interventional

Study of Glutathione, Vitamin C and Cysteine in Children With Autism and Severe Behavior Problems

NCT00889538
View directory record Official record
Conditions
Autism, Severe Behavior Disorder
Interventions
placebo, glutathione, glutathione, vit C and NAC
Drug
Lead sponsor
University of Louisville
Other
Eligibility
5 Years to 16 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Dec 7, 2016 · Synced Oct 13, 2026, 9:14 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

An Investigation of a Multi-Function Skincare Product to Improve Aging, Eczema, and Acne Outcomes

NCT05873933
View directory record Official record
Conditions
Acne, Eczema, Skin Aging
Interventions
Hemptress Oil
Other
Lead sponsor
Hemptress
Industry
Eligibility
21 Years to 65 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Oct 9, 2024 · Synced Oct 13, 2026, 9:14 PM 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 13, 2013 · Synced Oct 13, 2026, 9:14 PM 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 27, 2023 · Synced Oct 13, 2026, 9:14 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Gut Kidney Axis in Enteric Hyperoxaluria

NCT05124886
View directory record Official record
Conditions
Enteric Hyperoxaluria
Interventions
Moderately High Oxalate (MOx) Diet
Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 80 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2028
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Administration of Intravenous Vitamin C in Novel Coronavirus Infection (COVID-19) and Decreased Oxygenation

NCT04357782
View directory record Official record
Conditions
COVID-19, Hypoxia
Interventions
L-ascorbic acid
Drug
Lead sponsor
Hunter Holmes Mcguire Veteran Affairs Medical Center
Federal
Eligibility
18 Years to 99 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 25, 2022 · Synced Oct 13, 2026, 9:14 PM EDT
Not listed Not applicable Interventional

Supplemental Adjuvants for Intracellular Nutrition and Treatment

NCT00893724
View directory record Official record
Conditions
Neovascular Age-related Macular Degeneration, Diabetic Macular Edema
Interventions
Neutral pills with no medicinal effect, Inosine; Tocopherols, Tocotrienol, CoQ10 combination capsule; Niacinamide SR; Viatmin C; N-acetyl Cysteine; Complete Multivitamin with all minerals, Inosine; Tocopherol, Tocotrienol, CoQ10 combination capsule; Niacinamide; Vitamin C; N-acetyl Cysteine; Complete Multivitamin with all minerals; Minocycline
Drug · Dietary Supplement
Lead sponsor
Mid-Atlantic Retina Consultations, Inc.
Other
Eligibility
Not listed
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Morgantown, West Virginia
Source: ClinicalTrials.gov public record
Updated Jul 20, 2011 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Not applicable Interventional

Impact of HLNatural Immune Supplement on Colds

NCT04103099
View directory record Official record
Conditions
Immune System Diseases
Interventions
HLNatural Immune
Dietary Supplement
Lead sponsor
Hawthorne Effect Inc.
Other
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Lafayette, California
Source: ClinicalTrials.gov public record
Updated Nov 15, 2021 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nutrition Interventions to Support the Immune System in Response to Stress

NCT02053506
View directory record Official record
Conditions
Mitigation of Immune Function Decrements in Response to Stress
Interventions
Immune-enhancing nutritional beverage, Probiotics (BB-12), Placebo (for nutritional beverage and probiotic)
Dietary Supplement
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
18 Years to 45 Years
Enrollment
63 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Natick, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 2, 2017 · Synced Oct 13, 2026, 9:14 PM EDT
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 Oct 13, 2026 · Synced Oct 13, 2026, 9:14 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Oxalate Formation From Ascorbic Acid

NCT04603898
View directory record Official record
Conditions
Kidney Stone
Interventions
Low Oxalate Diet, Carbon-13 Ascorbic Acid Oral Load
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
19 Years and older
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jun 9, 2026 · Synced Oct 13, 2026, 9:14 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A 4-week Study Investigating Two Targeted Brightening Serum (A and B) Versus 4% Hydroquinone in Women With Mild to Severe Full-face Hyperpigmentation

NCT07644871
View directory record Official record
Conditions
Hyperpigmentation, Melasma, Dark Spots
Interventions
Facial Cleanser, Facial Moisturizer, Sunscreen SPF 55
Other
Lead sponsor
Revision Skincare
Industry
Eligibility
20 Years to 60 Years · Female only
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Irving, Texas
Source: ClinicalTrials.gov public record
Updated Jun 12, 2026 · Synced Oct 13, 2026, 9:14 PM EDT
Terminated Phase 2 Interventional Results available

High Dose Vitamin C in the Critically Ill Patient

NCT01587963
View directory record Official record
Conditions
Shock
Interventions
Ascorbic Acid, Ringers Lactate or Normal Saline
Drug · Other
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated May 11, 2017 · Synced Oct 13, 2026, 9:14 PM EDT
Terminated Phase 2 Interventional Results available

Pazopanib Hydrochloride With or Without Ascorbic Acid in Treating Patients With Kidney Cancer That Is Metastatic or Cannot Be Removed by Surgery

NCT03334409
View directory record Official record
Conditions
Clear Cell Renal Cell Carcinoma, Metastatic Clear Cell Renal Cell Carcinoma, Stage III Renal Cell Cancer AJCC v8, Stage IV Renal Cell Cancer AJCC v7, Unresectable Renal Cell Carcinoma
Interventions
Ascorbic Acid, Pazopanib Hydrochloride
Drug
Lead sponsor
Academic and Community Cancer Research United
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
5
States / cities
Peoria, Illinois • Urbana, Illinois • Rochester, Minnesota + 2 more
Source: ClinicalTrials.gov public record
Updated Mar 31, 2022 · Synced Oct 13, 2026, 9:14 PM EDT