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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.
10. You have to take it immediately at the very first sign of the oncoming. Edited on Fri Dec-17-04 10:55 PM by bobweaver. cold-that moment when you feel the first tingle in your nose. The zinc coats your nasal passages and inhibits the spread of the cold germs. If they have already spread, it's too late.