How AHA (Glycolic/Lactic) works AHA
AHAs (glycolic, lactic) are water-soluble acids that weaken the bonds between surface dead skin cells, loosening and shedding them to reveal smoother, brighter skin and to even tone; lactic also adds humectant hydration. Glycolic (smallest) penetrates fastest and is stronger; lactic is gentler. OTC commonly 5–10%; SPF is essential afterward.
| Acts on | surface exfoliation, glow & even tone |
|---|---|
| Evidence | Strong |
AHA (Glycolic/Lactic) guide →Effective % & pH →
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What is the difference between AHA and BHA?
AHAs like glycolic and lactic acid are water-soluble and work on the skin's surface to brighten and smooth, while BHA like salicylic acid is oil-soluble and gets into pores. In Korean skincare both are used sparingly, a few times weekly, always with daily sun protection.
How long does Korean skincare take to work?
Most skincare, Korean or otherwise, needs time. Hydration benefits can appear quickly, but visible changes in tone, texture or fine lines typically take several weeks to a few months of consistent use, roughly one skin cycle or more. Sun protection and patience matter more than any single product.
✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed 2026-06-21.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.