Lower incidence of sesquiterpene lactone sensitivity in a population in Asia versus a population in Europe: an effect of chrysanthemum tea?

Sesquiterpene lactones (SLs) (Fig. 1) are an important cause of allergic plant contact dermatitis but are uncommon in the Far East. They belong to the Compositae family of plants. Sensitivity to SL may be airborne or via the topical route [topical herbal remedies, cosmetic products, and in many occupations such as gardeners and florists].