What does glycolic acid do for skin?

Glycolic acid is an AHA with the smallest molecular size, allowing it to penetrate the skin most deeply among the alpha hydroxy acids. It exfoliates dead skin cells, stimulates collagen production, reduces fine lines, fades hyperpigmentation, and improves overall skin texture. Regular use produces noticeably smoother, more radiant skin. It is best suited for normal to oily skin types as it can be drying for sensitive skin.