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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.
Recommended dosages from the Arm & Hammer Company for colds and influenza back in 1925 were: 1  Day 1 â Take six doses of 1/2 teaspoon of baking soda in glass of cool water, at about two-hour intervals. 2  Day 2 â Take four doses of 1/2 teaspoon of baking soda in glass of cool water, at the same intervals.