Vitamin C Supplementation found to Reduce Frequency of Common Cold.

A Japanese study published online in the Aug. 24 issue of the European Journal of Clinical Nutrition (http://www.nature.com) found that vitamin C supplementation appears to reduce the frequency of the common cold. Researchers conducted a double blind, five-year, randomized, controlled trial of subjects who had been diagnosed with atrophic gastritis. Of a total of 439 subjects, 144 and 161 were assigned to receive 50 mg (low-dose group) or 500 mg (high-dose group) of vitamin C, respectively. During the supplementation phase, 61 dropped out, and 244 completed the trial.

Incidences of the common cold per 1,000 person-months were 21.3 for the low-dose group and 17.1 for the high-dose group. After adjustments for a number of variables, the relative risk of suffering a common cold three or more times during the survey period was 34% for the high-dose group. No apparent reduction was found in the severity and duration of colds.

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