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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Completed Not applicable Interventional

Literacy and Language Interventions Via Telepractice for School-Age Children

NCT03878641
View directory record Official record
Conditions
Literacy-language Intervention
Interventions
Children in Grade 1 to 5 with literacy and language needs
Behavioral
Lead sponsor
Vanderbilt University
Other
Eligibility
6 Years to 11 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 5, 2020 · Synced Sep 2, 2026, 10:55 AM EDT
Completed Phase 2 Interventional Results available

Males, Antioxidants, and Infertility Trial

NCT02421887
View directory record Official record
Conditions
Male Infertility
Interventions
Antioxidant Supplement, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
18 Years and older · Male only
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
10
States / cities
Los Angeles, California • San Francisco, California • Sunnyvale, California + 7 more
Source: ClinicalTrials.gov public record
Updated Sep 3, 2019 · Synced Sep 2, 2026, 10:55 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Withdrawn Not applicable Interventional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 9, 2015 · Synced Sep 2, 2026, 10:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Multi-Center, Open-label Study Evaluate the Efficacy and Tolerability of a Dual Skincare Regimen Treatment for Facial Hyperpigmentation and Photodamaged Skin in Patients Exposed to Extrinsic Factors of Aging

NCT05423873
View directory record Official record
Conditions
Hyperpigmentation, Photodamaged Skin, Wrinkle, Fine Lines
Interventions
Gentle Cleansing Lotion, Revision Skincare
Other
Lead sponsor
Revision Skincare
Industry
Eligibility
35 Years to 60 Years · Female only
Enrollment
33 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
3
States / cities
Solana Beach, California • Greenwood Village, Colorado • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jun 20, 2022 · Synced Sep 2, 2026, 10:55 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Folic Acid for Vascular Outcome Reduction In Transplantation (FAVORIT)

NCT00064753
View directory record Official record
Conditions
Chronic Kidney Disease, Cardiovascular Disease, Death
Interventions
High Dose Multivitamin, Low Dose Multivitamin
Drug · Device
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
35 Years to 75 Years
Enrollment
4,110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2011
U.S. locations
27
States / cities
Birmingham, Alabama • Phoenix, Arizona • Los Angeles, California + 22 more
Source: ClinicalTrials.gov public record
Updated Oct 17, 2017 · Synced Sep 2, 2026, 10:55 AM EDT
Recruiting Phase 1 Interventional

High Dose Ascorbic Acid (HDAA) in Patients With Plasma Cell Disorders

NCT06313502
View directory record Official record
Conditions
Plasma Cell Disorder
Interventions
75gm HDAA, 100gm HDAA, 125gm HDAA
Drug
Lead sponsor
University of Arkansas
Other
Eligibility
18 Years to 100 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Jun 3, 2026 · Synced Sep 2, 2026, 10:55 AM 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 24, 2017 · Synced Sep 2, 2026, 10:55 AM 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 2, 2026, 10:55 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Quercetin PK/PD Study in Healthy Adults and Patients With Hypercoagulable States

NCT01722669
View directory record Official record
Conditions
Healthy
Interventions
isoquercetin or quercetin
Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 11, 2020 · Synced Sep 2, 2026, 10:55 AM EDT
Completed Phase 1 Interventional

Trial of Combination Therapy to Treat COVID-19 Infection

NCT04482686
View directory record Official record
Conditions
COVID, Covid-19, Corona Virus Infection, Coronavirus Infection, Coronavirus-19, SARS-CoV2, SARS-CoV Infection
Interventions
Ivermectin, Doxycycline Hcl, Zinc, Vitamin D3, Vitamin C
Drug · Dietary Supplement
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Sep 23, 2024 · Synced Sep 2, 2026, 10:55 AM 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 2, 2026, 10:55 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety and Immunogenicity of Peru-15-pCTB in Healthy Adult Subjects

NCT00654108
View directory record Official record
Conditions
Gastroenteritis Escherichia Coli
Interventions
Ciprofloxacin, Peru-15-pCTB, Sodium bicarbonate/Ascorbic Acid/Aspartame Buffer
Drug · Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 45 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 28, 2021 · Synced Sep 2, 2026, 10:55 AM EDT
Recruiting Phase 3 Interventional

Trial of IV vs Oral Iron Treatment of Iron Deficiency Anemia in the Post-Operative Bariatric Surgical Patient

NCT04268849
View directory record Official record
Conditions
Iron Deficiency Anemia
Interventions
Ferumoxytol, Saline, Ferrous sulfate tablets, Vitamin C
Drug
Lead sponsor
Auerbach Hematology Oncology Associates P C
Other
Eligibility
18 Years and older
Enrollment
104 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 2, 2025 · Synced Sep 2, 2026, 10:55 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Pharmacokinetics Study of Intravenous Ascorbic Acid

NCT02534753
View directory record Official record
Conditions
Pharmacokinetics
Interventions
Ascor L 500® (Ascorbic Acid Injection, USP)
Drug
Lead sponsor
McGuff Pharmaceuticals, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 22, 2016 · Synced Sep 2, 2026, 10:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating the Effects of Supplemental Vitamin C on Infant Lung Function in Pregnant Smoking Women

NCT00632476
View directory record Official record
Conditions
Pregnancy, Smoking
Interventions
Placebo, Vitamin C
Other · Dietary Supplement
Lead sponsor
Oregon Health and Science University
Other
Eligibility
15 Years and older · Female only
Enrollment
282 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2012
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 3, 2013 · Synced Sep 2, 2026, 10:55 AM 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 2, 2026, 10:55 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Nebivolol and Endothelial Regulation of Fibrinolysis (NERF)

NCT01595516
View directory record Official record
Conditions
Prehypertension, Hypertension
Interventions
Nebivolol, Metoprolol, Placebo, Bradykinin, Saline, Vitamin C
Drug · Other
Lead sponsor
University of Colorado, Boulder
Other
Eligibility
45 Years to 65 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 24, 2019 · Synced Sep 2, 2026, 10:55 AM EDT
Withdrawn Not applicable Interventional

A Study to See if Certain Antioxidants and Vitamins Will Keep Lactate Levels Down in Patients Taking Anti-HIV Drugs

NCT00037063
View directory record Official record
Conditions
HIV Infections
Interventions
Thiamine hydrochloride, Riboflavin, Ascorbic acid, Vitamin E
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
13 Years and older
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
4
States / cities
Denver, Colorado • Cleveland, Ohio • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 3, 2015 · Synced Sep 2, 2026, 10:55 AM 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 29, 2024 · Synced Sep 2, 2026, 10:55 AM EDT
Withdrawn Phase 3 Interventional

Vitamin C and Atrial Fibrillation After Cardiac Surgery

NCT01580683
View directory record Official record
Conditions
Atrial Fibrillation
Interventions
Ascorbic Acid, Identical Placebo
Drug · Other
Lead sponsor
Regional Hospital of Scranton
Other
Eligibility
50 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Scranton, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 12, 2015 · Synced Sep 2, 2026, 10:55 AM EDT
Completed Phase 2 Interventional Results available

Cephalon Decitabine, Arsenic Trioxide and Ascorbic Acid for Myelodysplastic Syndrome

NCT00621023
View directory record Official record
Conditions
Myelodysplastic Syndrome
Interventions
Decitabine, Arsenic Trioxide and Ascorbic Acid
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 3, 2013 · Synced Sep 2, 2026, 10:55 AM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Effect of Age and Fitness on Vascular Function and Oxidative Stress During Acute Inflammation

NCT03889158
View directory record Official record
Conditions
Aging, Inflammation
Interventions
Typhoid Vaccine, Ascorbic Acid
Biological · Dietary Supplement
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years to 75 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 11, 2021 · Synced Sep 2, 2026, 10:55 AM EDT
Completed Phase 1 Interventional

Gemcitabine, Ascorbate, Radiation Therapy for Pancreatic Cancer, Phase I

NCT01852890
View directory record Official record
Conditions
Pancreatic Neoplasms
Interventions
Ascorbate, Gemcitabine, Radiation therapy
Drug · Radiation
Lead sponsor
Joseph J. Cullen
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2025
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Oct 23, 2025 · Synced Sep 2, 2026, 10:55 AM EDT
Terminated Phase 1 Interventional

Bevacizumab and Ascorbic Acid in Patients Treating With Recurrent High Grade Glioma

NCT02833701
View directory record Official record
Conditions
Glioblastoma, Glioma
Interventions
Ascorbic Acid, Bevacizumab, Laboratory Biomarker Analysis, Quality-of-Life Assessment
Dietary Supplement · Biological · Other
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 23, 2023 · Synced Sep 2, 2026, 10:55 AM EDT