The influenza vaccine, while not perfect, significantly decreases the risk of catching the annual flu epidemic. It may also lead to less severe symptoms if influenza does develop.

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Ginseng  

May Increase Effectiveness of Vaccine

A double-blind study of 227 individuals found that ginseng might help the vaccine work more effectively, increasing antibody production and decreasing the frequency of colds and flus. 1 The dose used in the study was 100 mg of Asian ginseng (Panax ginseng) taken twice daily for 1 month prior and 2 months after the vaccine was administered.