Glycolic Acid

Glycolic acid is the smallest AHA molecule, which lets it penetrate fastest and work hardest — the most potent everyday acid for resurfacing dull, uneven, sun-affected skin. It smooths texture, brightens tone and softens the look of fine lines. That strength means caution: start slow, use at night, and never skip SPF the next day. Best for normal to oily skin. See Pigmentation & Dark Spots.