Three Arm Trial of Immune Effects of Echinacea

Inclusion Criteria: * Healthy adult (based on a screening health questionnaire) * Speaks and reads English. * If female of child-bearing potential, willing to use contraception to prevent pregnancy during the study. * No use of any medication (other than multivitamins, essential fatty acids, oral contraceptives and probiotics) for 2 weeks prior to first dose of study. * Willing to abstain from ingesting edible mushrooms for 2 weeks prior and throughout study. * Willing to eat less than 2 garlic cloves per day for 2 weeks prior and during the study period Exclusion Criteria: * Pregnancy or currently breastfeeding. * History of autoimmune disease or immune disorders. * History of asthma. * History of allergic rhinitis. * History of physician diagnosed eczema, psoriasis or other skin condition that could mask an Echinacea-induced rash. * Known allergic reaction to Echinacea or related species, specifically ragweed (Ambrosia), chamomile (Matricaria), goldenrod (Solidago), and sunflower (Helianthus). * Known allergic reaction to xylitol sweetener, glycerine, citric acid, or citrus fruits