Clinical Research Directory
Browse clinical research sites, groups, and studies.
The Effect of Vitamin C Supplementation on Gut Microbiota Composition and Function in Healthy Adults
Sponsor: University of Glasgow
Summary
The aim of this dietary intervention study is to explore how vitamin C affects the bacteria that live in our gut. Vitamins are essential nutrients found in fruits and vegetables. Our bodies cannot make them on their own, but we need them to function correctly. Vitamins play various roles, including supporting the immune system and assisting with energy production. Some vitamins in our diet can reach the large intestine, where they may be used by gut bacteria to promote their growth. In this study, we aim to investigate how our gut bacteria interact with vitamin C and how this interaction affects their growth and activity. For this study, participants will follow their habitual diet for one-week (run-in period), followed by two consecutive two-week supplementation periods in which they will first take a moderate dose (200 mg/day) and then a high-dose (1000 mg/day) of vitamin C. A final one-week period follow up period will involve a return to their habitual diet. Faecal, blood and urine samples will be collected at the start and end of each supplementation period to explore changes in gut microbiota composition, activity and markers of inflammation.
Official title: The Effect of Vitamin C Supplementation on Gut Microbiota Composition and Metabolic Activity in Healthy Adults
Key Details
Gender
All
Age Range
18 Years - 65 Years
Study Type
INTERVENTIONAL
Enrollment
23
Start Date
2025-11-01
Completion Date
2026-07-01
Last Updated
2026-02-04
Healthy Volunteers
Yes
Interventions
Moderate Vitamin C dose (200 mg)
200 mg of vitamin C provided as a chewable tablet, taken orally daily for two weeks
High-dose vitamin C supplementation (1000 mg)
1000 mg of Vitamin C provided as a chewable tablet, taken orally daily for two weeks
Habitual diet (run in period)
this is a run-in period where participants consume their habitual diet for one week
Locations (1)
New Lister Building, Glasgow Royal Infirmary, 10-16 Alexandra Parade, G31 2ER
Glasgow, United Kingdom