The alcohol-free AHA 7 Whitehead Power Liquid by cosrx fights skin impurities using 7% AHA (glycolic acid) without causing dryness. Therefore, it is ideal for use on all skin types, including dry skin. Alpha hydroxy acid (AHA) stems from Pyrus malus water that is obtained from malic acid. The exfoliating effect of AHA buffs away dead skin cells and removes excess sebum in a gentle way. The result is clearer, more radiant-looking skin.