Washington: Vitamin C is beneficial against common cold particularly for people under heavy physical stress.In five randomized trials of participants with heavy short-term physical stress, vitamin C halved the incidence of the common cold.Three of the trials studied marathon runners, one studied Swiss school children in a skiing camp and one studied Canadian soldiers during a winter exercise.Furthermore, in a recent randomized trial carried out with adolescent competitive swimmers, vitamin C halved the duration of colds in males, although the vitamin had no effect on females.
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