Beauty: Beauty

Yerba maté, 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 maté 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.

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