Vitamin C and the common cold - Summary
Vitamin C has no impact on the prevention or duration of the common cold, with two exceptions:
Under extreme stress (e.g., marathon running, extreme cold) vitamin C seems to decrease the incidence of colds by 50%.
8 grams of vitamin C, digested on the first day of a cold, may decrease its duration.
So, as a regular prophylactic, or taken throughout the duration of a cold, there is no expectation of any impact of vitamin C on colds.
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Last Modification - June 29, 2005