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ClinicalTrials.gov public records Last synced Oct 3, 2026, 10:25 PM EDT

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Showing 25–38 of 38 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin C 1000 mg Clear all

Conditions: Preeclampsia
Interventions: Dietary Supplement/Vitamins, Placebo for Vitamin C and Vitamin E; Drug
Lead sponsor: The George Washington University Biostatistics Center; Other
Eligibility: Female only
Enrollment: 10,154 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2003 – 2009
U.S. locations: 16
States / cities: Birmingham, Alabama • Chicago, Illinois • Detroit, Michigan + 13 more

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

Conditions: Aging, Metabolism
Interventions: Intermittent Fasting, 400 IU Vitamin E, 1000 mg Vitamin C; Other · Dietary Supplement
Lead sponsor: University of Florida; Other
Eligibility: 19 Years to 30 Years
Enrollment: 37 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011
U.S. locations: 1
States / cities: Gainesville, Florida

Conditions: COVID-19, Corona Virus Infection, SARS-CoV-2, 2019-nCoV, 2019 Novel Coronavirus
Interventions: Hydroxychloroquine, Vitamin C; Drug · Dietary Supplement
Lead sponsor: Providence Health & Services; Other
Eligibility: 45 Years and older
Enrollment: 13 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2020 – 2022
U.S. locations: 1
States / cities: Portland, Oregon

Conditions: Cardiovascular Disease
Interventions: Vitamin C, Vitamin E, Placebo; Dietary Supplement
Lead sponsor: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK); NIH
Eligibility: 18 Years and older
Enrollment: 396 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2004 – 2008
U.S. locations: 1
States / cities: Berkeley, California

Conditions: Infant Mortality, Preterm Birth, Low Birth Weight, Neonatal Mortality, Perinatal Mortality
Interventions: Iron (27 mg) - folic acid (600 ug), Multiple micronutrient; Dietary Supplement
Lead sponsor: Johns Hopkins Bloomberg School of Public Health; Other
Eligibility: 12 Years to 45 Years · Female only
Enrollment: 44,567 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2012
U.S. locations: 1
States / cities: Baltimore, Maryland

Conditions: Kidney Stones, Kidney Calculi, Urolithiasis, Urolithiasis, Calcium Oxalate, Nephrolithiasis, Nephrolithiasis, Calcium Oxalate, Oxalate Urolithiasis, Healthy, Healthy Volunteer
Interventions: Low-oxalate diet and glycolate dosing, Oral glycolate dosing, Oral 13C- ascorbic acid dosing; Dietary Supplement
Lead sponsor: University of Alabama at Birmingham; Other
Eligibility: 18 Years to 80 Years
Enrollment: 80 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2025 – 2031
U.S. locations: 2
States / cities: Birmingham, Alabama • Dallas, Texas

Conditions: Blood Pressure, Hypertension
Interventions: Dextrose 20 % in 500 ML Injection, Intralipid, Saline, Ascorbic acid; Drug
Lead sponsor: University of Kansas Medical Center; Other
Eligibility: 18 Years to 79 Years
Enrollment: 46 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2022 – 2027
U.S. locations: 1
States / cities: Kansas City, Kansas

Conditions: Chronic Obstructive Pulmonary Disease (COPD)
Interventions: Tetrahydrobiopterin (BH4), Antioxidant Cocktail; Drug · Dietary Supplement
Lead sponsor: Augusta University; Other
Eligibility: 18 Years and older
Enrollment: 15 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2018
U.S. locations: 1
States / cities: Augusta, Georgia

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

Conditions: Myelodysplastic Syndromes, Chronic Myelomonocytic Leukemia-1, Cytopenia
Interventions: Vitamin C (ascorbic acid), Placebo; Dietary Supplement · Other
Lead sponsor: Copenhagen University Hospital, Rigshospitalet; Other
Eligibility: 18 Years and older
Enrollment: 109 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2025
U.S. locations: 1
States / cities: Los Angeles, California

Conditions: Dietary Modification
Interventions: C4 Extreme, C4 Extreme (without Advantra Z, Placebo; Dietary Supplement
Lead sponsor: Texas A&M University; Other
Eligibility: 18 Years to 40 Years
Enrollment: 31 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2014
U.S. locations: 1
States / cities: College Station, Texas

Conditions: Neoplasms, Metastatic Cancer, Advanced Cancer, Solid Tumor, Non Small Cell Lung Cancer Metastatic, Non Small Cell Lung Cancer Stage IIIB, Non Small Cell Lung Cancer
Interventions: Niraparib, TSR-042, Carboplatin-Paclitaxel, Bevacizumab, TSR-022, Carboplatin-Pemetrexed, Carboplatin-Nab-Paclitaxel; Drug
Lead sponsor: Tesaro, Inc.; Industry
Eligibility: 18 Years and older
Enrollment: 60 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2024
U.S. locations: 8
States / cities: Scottsdale, Arizona • Encinitas, California • San Marcos, California + 5 more

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

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Combined Antioxidant and Preeclampsia Prediction Studies (CAPPS)

Vitamin C Supplementation Intervention

Practicality of Intermittent Fasting and Its Effect on Markers of Aging and Oxidative Stress

Hydroxychloroquine in Patients With Newly Diagnosed COVID-19 Compared to Standard of Care

Gender, Obesity, C-Reactive Protein, and Oxidative Stress

Antenatal Micronutrient Supplementation and Infant Survival

Endogenous Oxalate Synthesis in Idiopathic Calcium Oxalate Kidney Stone Disease

Reversing Glucose and Lipid-mediated Vascular Dysfunction

Long Term Nitric Oxide Bioavailability on Vascular Health in Chronic Obstructive Pulmonary Disease

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

Epigenetics, Vitamin C, and Abnormal Blood Cell Formation - Vitamin C in Patients With Low-Risk Myeloid Malignancies

Assessment of a Pre-Workout Dietary Supplement

Study of Niraparib, TSR-022, Bevacizumab, and Platinum-Based Doublet Chemotherapy in Combination With TSR-042

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