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Showing 25–48 of 367 matching trials from the live ClinicalTrials.gov search.
Recruiting Not applicable Interventional Accepts healthy volunteers

Vascular Function and Oxidative Stress in Emergency Medical Responders

NCT06985394
Conditions
Cardiovascular Function in EMTs
Interventions
Antioxidant cocktail, Placebo
Dietary Supplement
Lead sponsor
University of Delaware
Other
Eligibility
20 Years to 40 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Newark, Delaware
Conditions
Pre-Eclampsia
Interventions
L-arginine supplementation in a medical food, Vitamin C and E supplementation in a medical food
Procedure
Lead sponsor
Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes
Government
Eligibility
19 Years to 32 Years · Female only
Enrollment
585 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2006
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Completed Phase 2 Interventional Results available

Alii Supplement Study

NCT07271316
Conditions
Nutrient Deficiency, Happiness, Digestive Health, Vulnerability to Disease, Mood Swings, Energy
Interventions
Alii Supplement
Dietary Supplement
Lead sponsor
Texas Christian University
Other
Eligibility
18 Years to 25 Years · Female only
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Fort Worth, Texas
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
Conditions
Cutis Laxa Facialis, Xeroderma
Interventions
HydraFacial Syndeo System, ReGen-GF, HydraFacial Elite MD System
Device · Drug
Lead sponsor
Austin Institute for Clinical Research
Network
Eligibility
30 Years to 55 Years
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
2
States / cities
Houston, Texas • Pflugerville, Texas
Conditions
Frailty, Inflammation
Interventions
Epigallocatechin-3-Gallate (EGCG), Microcrystalline cellulose (MCC), Ascorbic Acid (Vitamin C)
Drug · Dietary Supplement
Lead sponsor
University of Rochester
Other
Eligibility
65 Years and older
Enrollment
118 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2030
U.S. locations
1
States / cities
Rochester, New York
Conditions
Glioblastoma Multiforme
Interventions
Temozolomide, radiation therapy, Ascorbic Acid
Drug · Radiation
Lead sponsor
Bryan Allen
Other
Eligibility
18 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2028
U.S. locations
1
States / cities
Iowa City, Iowa
Completed Not applicable Interventional Accepts healthy volunteers Results available

Nitric Oxide Bioavailability in Chronic Obstructive Pulmonary Disease (COPD)

NCT01398943
Conditions
Pulmonary Disease, Chronic Obstructive
Interventions
Tetrahydrobiopterin (BH4), Antioxidant Cocktail
Drug · Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Augusta, Georgia
Conditions
Pancreatic Cancer, Pancreas Cancer, Pancreatic Adenocarcinoma Resectable, Pancreatic Ductal Adenocarcinoma, Pancreas Metastases
Interventions
High Dose Ascorbic Acid 25 g/m^2, Nanoparticle Paclitaxel protein bound 125mg/m^2, Cisplatin 25mg/m^2, Gemcitabine 1000mg/m^2, High Dose Ascorbic Acid 37.5 g/m^2, High Dose Ascorbic Acid 56.25 g/m^2, High Dose Ascorbic Acid 75 g/m^2
Drug
Lead sponsor
HonorHealth Research Institute
Other
Eligibility
18 Years and older
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
1
States / cities
Scottsdale, Arizona
Completed Not applicable Interventional Accepts healthy volunteers

Nutrition Interventions to Support the Immune System in Response to Stress

NCT02053506
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
Terminated Not applicable Interventional Accepts healthy volunteers

The Effects of Vitamin C on Acute-Exercise in Postmenopausal Females

NCT07109115
Conditions
Females, Males, Menopause, Sedentary, Healthy Participants
Interventions
Vitamin C (Ascorbic Acid)
Dietary Supplement
Lead sponsor
University of Virginia
Other
Eligibility
45 Years and older
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Charlottesville, Virginia
Completed Phase 4 Interventional Accepts healthy volunteers Results available

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

NCT06654089
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
Recruiting No phase listed Observational Accepts healthy volunteers

Urinary Vitamin C Loss in Diabetic Subjects

NCT00071526
Conditions
Diabetes
Interventions
Not listed
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years to 65 Years
Enrollment
5,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2006
U.S. locations
1
States / cities
Bethesda, Maryland
Completed Phase 1Phase 2 Interventional Results available

Velcade, Trisenox, Vitamin C and Melphalan for Myeloma Patients

NCT00469209
Conditions
Myeloma
Interventions
Trisenox (Arsenic Trioxide), Velcade (Bortezomib), Melphalan, Vitamin C (Ascorbic Acid)
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
Up to 75 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Houston, Texas
Conditions
Acne Scarring
Interventions
Universal Peel, Microneedling, Post-Microneedling Skin Care, Post-Universal Peel Skin Care
Drug · Procedure
Lead sponsor
Englewood Hospital and Medical Center
Other
Eligibility
18 Years to 60 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Englewood Cliffs, New Jersey
Completed No phase listed Observational Accepts healthy volunteers

Pediatric COVID Outcomes Study (PECOS)

NCT04830852
Conditions
Covid19, MIS-C Associated With COVID-19, MIS-C Multisystem Inflammatory Syndrome in Children, SARS-CoV2 Infection
Interventions
Not listed
Lead sponsor
Children's National Research Institute
Other
Eligibility
0 Years to 21 Years
Enrollment
1,097 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Bethesda, Maryland
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
Conditions
Glioma
Interventions
5-Aminolevulinic acid (ALA), Placebo - ascorbic acid
Drug
Lead sponsor
St. Joseph's Hospital and Medical Center, Phoenix
Other
Eligibility
18 Years and older
Enrollment
127 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2018
U.S. locations
1
States / cities
Phoenix, Arizona
Conditions
HIV Infections, Disease Transmission, Vertical
Interventions
Vitamin A + Beta Carotene, Multivitamins, Placebo
Dietary Supplement · Other
Lead sponsor
Harvard School of Public Health (HSPH)
Other
Eligibility
18 Years and older · Female only
Enrollment
1,085 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1995 – 2003
U.S. locations
1
States / cities
Boston, Massachusetts
Conditions
Adequate Vitamin C Status, Inadequate Vitamin C Status
Interventions
Vitamin C Supplement + Low Vitamin C Diet, Placebo + Low Vitamin C Diet
Dietary Supplement
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 50 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Columbus, Ohio
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
Conditions
Pancreatic Neoplasm
Interventions
Ascorbate, Gemcitabine, radiation therapy
Drug · Radiation
Lead sponsor
Joseph J. Cullen, MD, FACS
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2030
U.S. locations
1
States / cities
Iowa City, Iowa
Conditions
Metastatic Pancreatic Cancer
Interventions
Gemcitabine and Erlotinib, Intravenous Vitamin C
Drug · Dietary Supplement
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Thomas Jefferson University
Other
Eligibility
18 Years to 75 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Recruiting Not applicable Interventional Accepts healthy volunteers

Impact of Phenylalanine Elevations on Brain and Cognition in Adult PKU Carriers

NCT07220265
Conditions
Carrier of Phenylketonuria, Healthy
Interventions
Phenylalanine (Phe), Placebo
Dietary Supplement
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years to 60 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Columbia, Missouri