Beauty

By Kate Betts

Yerba mate, the latest ingredient to hit the skin-care market, comes from a small tree in South America. Like green tea and tea-tree oil before it, yerba mate promises to reduce inflammation and treat such skin problems as acne, psoriasis and sun damage. Anticipating another skin-care craze, Kiehl's has already introduced it in a face cleanser, toner and lotion, below.