PHA + Salicylic Acid Serum is the ultimate transforming solution ? for smooth, clear and blemish-free skin that glows with radiance and health. Its exfoliating prowess is all down to 10% Polyhydroxy Acid (PHA) and 2% Salicylic Acid. This power couple works hard to exfoliate away dull, rough dead cells that block your skin's radiance and help make acne a distant memory.