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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.
Several herbs, including osha, yarrow, kudzu, and ginger, are said to help avert colds when taken at the first sign of infection. Other herbs sometimes recommended to reduce cold symptoms include mullein, marshmallow, and peppermint.