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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.
Garlic strengthens the immune system as well as helps to fight chest infections, coughs and congestion. In the winter months garlic is a great food to boost your immune system and ward off colds and flu. An old folk remedy is to eat a clove of garlic that has been dipped in honey at the first sign of a cold.