The root of this daisy-like flower revs up the immune system. According to an analysis by University of Wisconsin researchers, in eight of nine studies evaluating echinacea for upper-respiratory infections, the herb reduced symptoms and accelerated recovery compared with placebos . Echinacea is available in teas and capsules, though most herbalists prefer tinctures. Liquid echinacea products may cause temporary, harmless numbing or tingling of the tongue; minor stomach upset is possible with tinctures.
