American ginseng & colds

Consumption of North American ginseng (Panax quinquefolium) appears to confer some immunity to catching colds. Two hundred and seventy-nine subjects were randomised to receive either 400mg of freeze-dried ginseng or placebo for four months. Consumption of the ginseng was a associated with a decreased mean number of colds and reduced total symptom scores and days of illness. (Predy GN et al. Effica ...
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