Lactic acid ek alpha-hydroxy acid hai jo skin ko exfoliate karta hai. Ye corneocytes ke beech bonds ko loosely kar deta hai, jisse skin cell turnover badhta hai. Saath saath humectant ki tarah kaam karte hue skin ka hydration, texture aur tone improve karta hai. Isko generally alag-alag concentrations mein use kiya jaata hai.