Clinical trials: Ascorbic Acid
Ocular Physiology, Regional Blood Flow
Effects of Vitamin C on Hyperoxia-Induced Reduction of Retinal Blood Flow
High arterial blood oxygen tension leads to vasoconstriction of retinal vessels, possibly related to an interaction between reactive oxygen species and endothelium-derived vasoactive factors.
- Trial name
- NCT00712907
- Testing
- vitamin C (Mayrhofer) 24mg/min i.v. for 64 min, 100% O2 (AGA) two times for 12 min
- Where
- Austria
- Volunteers
- 12 people, healthy volunteers welcome
- Sponsor
- Medical University of Vienna
Male Infertility
Effect of Eurycoma Longifolia (DLBS5055) and Multivitamins (Vitamin C+Vitamin E+ β-carotene) for Infertile Males
Infertility is defined as the inability of a couple to get pregnant after one year of regular and unprotected sexual intercourse.
- Trial name
- NCT06100432
- Testing
- DLBS5055 200mg, Multivitamin (Vitamin C 500mg + Vitamin E 100IU + Beta Carotene 10000IU)
- Where
- Indonesia
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- Duta Wacana Christian University
Stress, Psychological
Effect of Low Doses of Vitamin C on Salivary Cortisol , Heart Rate , Blood Pressure During Group Presentation
Vitamin C (ascorbic acid) is a well-known antioxidant that is involved in anxiety, stress, depression, fatigue and mood state in humans .
- Trial name
- NCT04135378
- Testing
- ascorbic acid
- Where
- Iraq
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- Kufa University
Iron Deficiency (Without Anemia)
Effect of Chitin and Ascorbic Acid on Dietary Insect Iron Absorption
Iron is involved in many vital metabolic processes such as oxygen transport, electron transport in cells, DNA synthesis and repair, and muscle metabolism.
- Trial name
- INSECTE (NCT06822062)
- Testing
- Meal A, Meal B, Meal C
- Where
- Switzerland
- Volunteers
- 25 people, healthy volunteers welcome
- Sponsor
- Swiss Distance University of Applied Sciences
Pulmonary Function; Newborn, Abnormal, Infant Wheeze
Vitamin C to Decrease Effects of Smoking in Pregnancy on Infant Lung Function
Vitamin C supplementation (500 mg per day) given to pregnant women who can not quit smoking will improve the pulmonary function tests in their offspring measured at 3 months of age.
- Conditions
- Pulmonary Function; Newborn, Abnormal, Infant Wheeze, In-utero Nicotine, Second Hand Smoke
- Trial name
- VCSIP (NCT01723696)
- Testing
- Vitamin C +prenatal vitamin
- Where
- 2 sites in United States
- Volunteers
- 252 people, healthy volunteers welcome
- Sponsor
- Oregon Health and Science University
Vitamin C Deficiency
"Novo C Plus" Vitamin C Containing Dietary Supplement Bioavailability in Healthy Subjects
The aim of this study is to evaluate the bioavailability of "Novo C Plus" vitamin C containing dietary supplement compared to licensed vitamin C medications. The novelty of this product is the liposomal formulation.
- Trial name
- NCT02606773
- Testing
- Ascorbic Acid
- Where
- Hungary
- Volunteers
- 32 people, healthy volunteers welcome
- Sponsor
- Semmelweis University
Fontan Procedure, Hypoplastic Left Heart Syndrome
Impact of Vitamin C on Endothelial Function and Exercise Capacity in Fontan-Palliated Patients
In this study, investigators will evaluate the effect of vitamin C on endothelial function, exercise tolerance and quality of life in patients with a single ventricle who have been palliated to Fontan physiology.
- Conditions
- Fontan Procedure, Hypoplastic Left Heart Syndrome, Tricuspid Atresia
- Trial name
- NCT00974025
- Testing
- Vitamin C
- Where
- United States
- Volunteers
- 53 people, healthy volunteers welcome
- Sponsor
- University of Michigan
Depigmentation Treatment, Depigmentation
Effect of Co-enzyme Q10 and Vitamin C Alone or in Combination After a Surgical Gingival Depigmentation
This study aims to assess the clinical effectiveness of Co-enzyme Q10 and Vitamin C, applied individually or in combination after surgical gingival depigmentation.
- Trial name
- Effect of Coe (NCT07677826)
- Testing
- surgical depigmentation, Coenzyme Q10, Vitamin C
- Where
- Egypt
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- Al-Azhar University
Interventional
The Effect of Exercise and Presleep Nutrition on Muscle Connective Tissue Remodelling
The primary objective of this study will be to determine the influence of a presleep vitamin C-enriched, collagen-modelled supplement (CVC) on the metabolic fate of dietary glycine using a [2H5]glycine tracer within the…
- Trial name
- NCT06054620
- Testing
- Collagen and Vitamin C
- Where
- Canada
- Volunteers
- 12 people, healthy volunteers welcome
- Sponsor
- University of Toronto
Kidney Stone
Oxalate Formation From Ascorbic Acid
The purpose of this basic research study is to determine the contribution of endogenous ascorbic acid (AA) turnover to urinary oxalate excretion in both normal BMI and obese adult non-stone formers and calcium oxalate stone…
- Trial name
- NCT04603898
- Testing
- Low Oxalate Diet, Carbon-13 Ascorbic Acid Oral Load
- Where
- United States
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- University of Alabama at Birmingham
Diabetes Mellitus, Non-Insulin Dependent, Non-Insulin Dependent
Study of the Effects of Vitamin C on Patients With Type 2 Diabetes
Diabetes is a disease characterized by decreased sensitivity to the action on insulin to promote sugar (glucose) use and blood vessel relaxation (vasodilation) in muscle.
- Trial name
- NCT00001870
- Testing
- Acetylcholine
- Where
- United States
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- National Center for Complementary and Integrative Health (NCCIH)
Obstetric Labor Complications, Fever
Effect of Intravenous Vitamin C on Intrapartum Maternal Fever After Epidural Labor Analgesia
This study aims to explore the effect of intravenous vitamin C infusion on intrapartum fever after epidural labor analgesia, to reduce the impact of intrapartum fever on maternal and infant, improve maternal and infant outcomes…
- Trial name
- EIVCIMFAELA (NCT06354582)
- Testing
- Vitamin C Injection, Normal saline
- Where
- China
- Volunteers
- 400 people, healthy volunteers welcome
- Sponsor
- Kunyue Li
Iron-deficiency
Measuring Dietary Iron Absorption From Edible Insects and Assessing the Effect of Chitin Content on Iron Bioavailability (Study 2)
Due to the growing world population, there is a need to develop viable ecological and nutritional alternatives to animal food products.
- Trial name
- Sustironable2 (NCT05328141)
- Testing
- Bread and butter, X.gideon, X.gideon with ascorbic acid
- Where
- Switzerland
- Volunteers
- 11 people, healthy volunteers welcome
- Sponsor
- Swiss Federal Institute of Technology
Post Operative Pain
Effect of Ascorbic Acid Final Flush on Post-operative Pain in Mandibular Molars.
The study is conducted to evaluate the effect of Ascorbic acid as a final flush on post operative pain after single visit root canal treatment in cases with symptomatic irreversible pulpits.
- Trial name
- NCT05478044
- Testing
- Ascorbic acid, saline
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Cairo University
Inflammation, Oxidative Stress
Antioxidants Combined With Cryotherapy on Inflammatory Response After Resistance Exercise in Untrained Volunteers
Acutely resistance exercise induces inflammatory responses and leukocytosis arising of oxidative stress, that clinically manifested by pain and/or delayed onset muscle soreness (DOMS).
- Conditions
- Inflammation, Oxidative Stress, Pain
- Trial name
- NCT02902315
- Testing
- Cryotherapy, Vitamins C and E, Vitamins C and E associated with cryotherapy
- Where
- Brazil
- Volunteers
- 26 people, healthy volunteers welcome
- Sponsor
- Universidade Federal de Santa Maria
Collagen Synthesis, Rate of Force (RFD) Development
Effects of Hydrolyzed Collagen and Vitamin C on Explosive Performance
Determine whether supplementation with a combined dose of 20 g of hydrolyzed collagen and 50 mg vitamin C, along with a power training exercise program, increases rate of force development (RFD) and performance in athletes
- Trial name
- NCT04437758
- Testing
- Collagen and Vitamin C powder mix nutritional intervention, Maximum power training exercise
- Where
- United States
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- PepsiCo Global R&D
Noise-Induced Hearing Loss
Micronutrients to Prevent Noise-induced Hearing Loss
Noise-induced hearing loss (NIHL) is a significant clinical, social, and economic issue. Studies in animals have allowed us to identify mechanisms contributing to NIHL, including direct mechanical trauma, free radicals formed in…
- Trial name
- NCT00808470
- Testing
- beta-carotene, vitamins C and E, magnesium
- Where
- United States
- Volunteers
- 72 people, healthy volunteers welcome
- Sponsor
- University of Michigan
C-reactive Protein, Inflammation
Obesity, Inflammation and Oxidative Stress
The purpose of this study is to determine whether or not Vitamin C (1000 mg/day) can reduce markers of inflammation, especially C-reactive protein (CRP), in obese persons with baseline CRP greater than 1 mg/dl.
- Conditions
- C-reactive Protein, Inflammation, Obesity, Oxidative Stress
- Trial name
- NCT01028976
- Testing
- Vitamin C (ascorbic acid)
- Where
- United States
- Volunteers
- 512 people, healthy volunteers welcome
- Sponsor
- University of California, Berkeley
Thin Gingival Biotype
Comparative Evaluation of Vitamin C and Injectable-platelet Rich Fibrin in the Management of Thin Gingival Phenotype
The goal is to compare between the effect of vitamin C and Injectable-platelet rich fibrin in the management of thin gingival phenotype.
- Trial name
- NCT05841303
- Testing
- Vit C, injectable PRF
- Where
- Egypt
- Volunteers
- 13 people, healthy volunteers welcome
- Sponsor
- Cairo University
Gingival Pigmentation, Depigmentation
Gingival Hyperpigmentation Treatment
It is a clinical study conducted to evaluate the effect of vitamin C and Glucathonine injection of pigmented gingival tissue versus surgical removal by scalpel
- Conditions
- Gingival Pigmentation, Depigmentation, Vitamin C, Glutathione
- Trial name
- NCT07595705
- Testing
- Vitamin c and glutathione, Surgical depigmentation
- Where
- Egypt
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Cairo University