AHA ~ Alpha Hydroxy Acid.

The exfoliant that works at the surface ~ and Korea formulates it without the burn.

Alpha hydroxy acids ~ glycolic acid, lactic acid, mandelic acid, malic acid ~ are water-soluble exfoliants that dissolve the bonds holding dead skin cells to the surface, accelerating the cell turnover that reveals brighter, smoother, more even skin beneath. They are among the most clinically studied and consistently effective actives in skincare ~ with decades of evidence behind their ability to improve texture, fade hyperpigmentation, reduce fine lines, and produce the kind of surface refinement that physical exfoliation simply cannot replicate.

The difference between a well-formulated AHA and an aggressive one is pH and concentration ~ and Korea understands this better than anyone. Too high a concentration without the right pH buffering produces the stinging, peeling, and sensitivity that has given chemical exfoliants a complicated reputation. Korean AHA formulations are precisely buffered to the pH range where the acid is most effective ~ low enough to exfoliate, high enough to remain tolerable ~ and paired with barrier-supporting, calming actives that allow consistent daily or multi-weekly use without the recovery period that Western acid treatments typically demand.

Glycolic acid ~ the smallest AHA molecule ~ penetrates deepest and produces the most dramatic results on texture and pigmentation. Lactic acid is gentler, more hydrating, and better tolerated by sensitive skin. Mandelic acid ~ the largest molecule ~ works most slowly and is the most appropriate starting point for reactive and sensitive skin types new to chemical exfoliation.

Used consistently, AHA produces cumulative results ~ skin that is visibly smoother, more even, and more luminous than it was before, with a surface texture that makes every other product in the routine absorb and perform better.

Best for: texture, dullness, hyperpigmentation, fine lines, uneven tone, cell turnover ~ use in the evening and always follow with SPF.