Clinical trials: Vitamin C
Quality of Life
Effect of Colon Delivered Vitamin C on Gut Microbiota and Related Health Biomarkers in Healthy Older Adults
Recent studies have shown that many vitamins, if consumed in high daily dosages or delivered to the colon, can modulate the gut microbiota and their metabolites.
- Trial name
- NCT05598619
- Testing
- Vitamin C
- Where
- Ireland
- Volunteers
- 264 people, healthy volunteers welcome
- Sponsor
- dsm-firmenich Switzerland AG
Effect of Food Supplement
Effects of Vitamin C Enriched Hydrolyzed Collagen, PrimaColl™, Whey Protein, or Placebo on Collagen Synthesis
The purpose of this study is to determine the effects of repeated dosing vitamin C enriched hydrolyzed collagen (HC) over a 24hr period, compared to PrimaColl™ (PC), whey protein (WP) and placebo (PL), with prescribed exercise on…
- Trial name
- NCT05427279
- Testing
- Hydrolized Collagen, PrimaColl, Whey protein
- Where
- United States
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- University of California, Davis
Endothelial Function, Cognition
Cognitive and Cerebral Blood Flow Effects of Vitamin C
This investigation is interested in the effects of high dose vitamin C on endothelial function in healthy humans. A high fat meal will be utilized to induce endothelial dysfunction.
- Trial name
- NCT01055418
- Testing
- Vitamin C
- Where
- United Kingdom
- Volunteers
- 24 people, healthy volunteers welcome
- Sponsor
- Northumbria University
Vitamin C, Glutathione
Effect of Double Nutri® Liposomal Encapsulation Technology on Human Absorption of Vitamin C and Glutathione Liquid Sachet
The objective of this study is to evaluate whether Double Nutri® liposomal encapsulation technology can enhance the oral absorption of liquid vitamin C and glutathione supplements in humans.
- Trial name
- NCT07302828
- Testing
- Vitamin C and Glutathione without liposome, Liposomal Vitamin C and Glutathione
- Where
- Taiwan
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- TCI Co., Ltd.
Deficiency, Vitamin C
Hypovitaminosis C Prevalence and Risk Factors in an Acute Geriatric Unit
Vitamin C is essential for numerous biological processes as it acts as a cofactor in various hydroxylation reactions, but also as a powerful antioxidant.
- Trial name
- HYPO-VIT-C (NCT05668663)
- Testing
- Plasmatic Vitamin C concentrations (known as ascorbemia) on a single blood sample
- Where
- France
- Volunteers
- 434 people, healthy volunteers welcome
- Sponsor
- Hospices Civils de Lyon
Type 2 Diabetes, Oxidative Stress
Quantitative in Vivo Biomarkers of Oxidative Stress in Diabetes
Oxidative stress has been implicated in the development and complications of diabetes. Hyperglycemia and insulin resistance or insufficiency in diabetes can cause oxidative stress by excessive reactive oxygen species and can…
- Trial name
- NCT00845130
- Testing
- ascorbic acid (Vitamin C)
- Where
- United States
- Volunteers
- 42 people, healthy volunteers welcome
- Sponsor
- In-Young Choi, Ph.D.
Periodontitis, Polymorphism, Restriction Fragment Length
Vitamin D Receptor, Interleukin-1A and Interleukin-1B Gene Polymorphisms in Periodontitis
Background: The aim of the study is to find out the prevelance of VDR (rs731236), IL1B (rs1143634) and IL1A (rs1800587)gene polymorphisms in Turkish population and their association with stage III grade B / C periodontitis.
- Trial name
- NCT04806971
- Where
- 2 sites in Turkey (Türkiye)
- Volunteers
- 200 people, healthy volunteers welcome
- Sponsor
- Marmara University
Postural Tachycardia Syndrome
Local Vasoconstriction in Postural Tachycardia Syndrome
The investigators study will determine how often blood flow regulation abnormalities and abnormalities of sympathetic regulation produced by nitric oxide, angiotensin-II, and oxidative stress occur in POTS and the mechanism(s) of…
- Trial name
- NCT01210430
- Testing
- Losartan, Ascorbic Acid (Vitamin C), Normal Saline
- Where
- United States
- Volunteers
- 74 people, healthy volunteers welcome
- Sponsor
- New York Medical College
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
Bowel Preparation Solution
PEG-Asc Vs. SPMC for Bowel Preparation in Capsule-based Procedures
This clinical research study is designed to find out which of two different types of bowel preparation works best for people undergoing capsule-based endoscopy procedures.
- Trial name
- NCT07206329
- Testing
- Polyethylene Glycol plus Ascorbic Acid (PEG-Asc), Sodium Picosulfate with Magnesium Citrate (SPMC)
- Where
- Portugal
- Volunteers
- 220 people, healthy volunteers welcome
- Sponsor
- Unidade Local de Saúde do Alto Ave, EPE
Stress, Stress (Psychology)
Effect of Magnesium-, Vitamin C- and Grape Seed Extract-Enriched Date Bars on Perceived Stress and Salivary Cortisol Levels in Young Women
This randomized controlled trial aims to evaluate the effect of a 4-week daily consumption of a functional date bar enriched with magnesium, vitamin C, and grape seed extract on perceived stress and salivary cortisol levels in…
- Trial name
- NCT07585422
- Testing
- Functional Bar
- Where
- Russia
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- K.G. Razumovsky Moscow State University of Technologies and Management
Preterm Premature Rupture of Membranes
The Relation Between Serum Ascorbic Acid Concentration and Preterm Premature Rupture of Membranes
To study the association between maternal serum vitamin C concentration in women with preterm premature rupture of membranes (PPROM) and women without PPROM.
- Trial name
- NCT02635451
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Ain Shams Maternity Hospital
Malaria
Micronutrients and Child Health Study
The purpose of this study is to determine to what extent supplementation with zinc and other micronutrients are efficacious in preventing malaria in young Tanzanian children.
- Trial name
- MACH (NCT00623857)
- Testing
- Zinc, Vitamins and minerals other than zinc, Vitamins plus zinc and other minerals
- Where
- Tanzania
- Volunteers
- 612 people, healthy volunteers welcome
- Sponsor
- Wageningen 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
Pregnancy, Smoking
Evaluating the Effects of Supplemental Vitamin C on Infant Lung Function in Pregnant Smoking Women
Women who smoke during their pregnancy place their unborn child at an increased risk of health problems, including decreased lung function and possible lung diseases later in life.
- Trial name
- NCT00632476
- Testing
- Vitamin C
- Where
- United States
- Volunteers
- 282 people, healthy volunteers welcome
- Sponsor
- Oregon Health and Science University
Exercise, Blood Flow Restriction (BFR) Training Effects
Effects of BFR-training on Stem Cells and Immune Cells in Human Skeletal Muscle
In this 3-year project, investigators will first measure stem cells (primary outcome) and immune cells (secondary outcome) in human skeletal muscle immediately after and 24 hour after the BFR-training.
- Conditions
- Exercise, Blood Flow Restriction (BFR) Training Effects, Supplement
- Trial name
- NCT07569627
- Testing
- BFR (180 mmHg), NMN-BFR exercise, Vitamin C-resistance exercise
- Where
- Taiwan
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- University of Taipei
Pain Perception, Root Resorption
The Potential Effect of the Local Administration of Vitamins C and E on Orthodontic Treatment: A Randomized Clinical Trial
Brief Summary of the Study This study investigates the effects of locally administered vitamins C and E on orthodontic tooth movement during the initial stage of treatment.
- Conditions
- Pain Perception, Root Resorption, Rate of Orthodontic Tooth Movement, Biomarkers
- Trial name
- NCT06847880
- Testing
- 1: Vitamin C Supplementation, Vitamin E Supplementation, Saline Solution (Control)
- Where
- 3 sites in Iraq
- Volunteers
- 56 people, healthy volunteers welcome
- Sponsor
- University of Baghdad
Metabolism Changes, Vitamin D
Does Vitamin C Increase the Body Heat Generated By The Nervous System?
The goals of this clinical trial are to determine whether or not vitamin C is able to: (1) increase the body heat generated by the sympathetic nervous system; and, (2) increase circulating vitamin D concentration during…
- Trial name
- NCT07341308
- Testing
- Vitamin C
- Where
- United States
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- Colorado State University
Iron Absorption, Gut Microbiota
Iron Absorption From a Wheat-based Instant Cereal:Gut and Stable Isotope Studies in Kenyan Infants
The aim of this study is to measure the effect of a prebiotic (high dose/low dose) mixture at different doses within a wheat-based instant cereal, on fractional iron absorption (FIA), gut microbiota and inflammation after three…
- Trial name
- NCT03894358
- Testing
- FeFum and 7.5 g prebiotic mixture, FeFum and 3 g prebiotic mixture, Fefum and no prebiotic mixture
- Where
- Kenya
- Volunteers
- 195 people, healthy volunteers welcome
- Sponsor
- Swiss Federal Institute of Technology
Squamous Cell Cancer, Squamous Cell Carcinoma
Topical Ascorbic Acid for Treatment of Squamous Cell Skin Cancer
Randomized comparative trial of a 30% solution of ascorbic acid in 95% dimethylsulfoxide applied topically twice a day for 8 weeks vs 5% imiquimod cream in the treatment of biopsy proven squamous cell carcinomas of the skin in…
- Conditions
- Squamous Cell Cancer, Squamous Cell Carcinoma, Skin Cancer, Non-melanoma Skin Cancer
- Trial name
- NCT05932511
- Testing
- 30% ascorbic acid in DMSO
- Where
- United States
- Volunteers
- 15 people, healthy volunteers welcome
- Sponsor
- Center for Biomedical Research, Inc.