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1 However, taking vitamin C before the onset of cold symptoms may shorten the duration of symptoms. 2  Vitamin C may provide benefit for people at high risk of colds due to frequent exposure â for example, children who attend group child care during the winter.
40 mg/day. To avoid irritating the stomach, take zinc with food. For the common cold, zinc lozenges are supposed to be started within 24 hours of the onset of cold symptoms. Then, take the zinc lozenges every two to three hours -- while you're awake, of course -- until the symptoms go away.