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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.
Zinc helps treatânot preventâa cold. Popping zinc within 24 hours of the start of symptoms helps shorten your sniffle, according to a 2013 Cochrane review. The authors say significant effects were seen at doses of at least 75 mg (the equivalent of three or four lozenges) per day, taken as long as your cold lasts. How does it work?