Echinacea preparations (from Echinacea purpurea & other Echinacea species) may improve the body's natural immunity. Echinacea is of the most often used herbal products, but studies are mixed as to whether it can help prevent or treat colds. A meta-analysis of 14 clinical studies examining the effect of echinacea on the incidence & period of the common chilled found that echinacea supplements decreased the odds of getting a chilled by 58%. It also shortened the period of a chilled by one.4 days.
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