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RECRUITING
NCT07388121
NA

The Effect of Vitamin C Supplementation on Gut Microbiota Composition and Function in Healthy Adults

Sponsor: University of Glasgow

View on ClinicalTrials.gov

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

DIETARY_SUPPLEMENT

Moderate Vitamin C dose (200 mg)

200 mg of vitamin C provided as a chewable tablet, taken orally daily for two weeks

DIETARY_SUPPLEMENT

High-dose vitamin C supplementation (1000 mg)

1000 mg of Vitamin C provided as a chewable tablet, taken orally daily for two weeks

OTHER

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