We’ve combined Glycolic and Lactic Acid (which naturally help to remove rough, flaky skin) with soothing Niacinamide. Ingredients for happy, silky smooth feet. How to use Wash and dry feet. Cut the seal of each sock to open it. Slip feet into socks (avoid walking). Remove socks and rinse off remaining serum. Feet will begin to exfoliate naturally after 3 to 7 days.