Doses of vitamin C do not protect against common cold

摘要

Prophylatic use of vitamin C does not offer protection against the common cold in the general population but can reduce the duration of illness,.a review suggests (Cochrane Database of Systematic Reviews 2007;issue 3).Comparison of 30 trials including 11,350 participants showed the relative risk of developing a cold when taking prophylactic vitamin C (200mg per day or higher) to be 0.96 (95 per cent confidence interval 0.92-1.00).