Isntree Chestnut BHA 2% Clear Liquid
A leave-on BHA liquid built on salicylic acid alongside chestnut shell extract, which is where the name comes from. Unlike an acid cleanser, this stays on the skin, which is the only way a BHA can do the thing BHAs are good at — working through sebum to loosen what is blocking a pore. Isntree keeps the formula plain and low-fragrance, in line with the rest of its range.
What it is built around
Who it suits
Oily, congested and blackhead-prone skin, particularly around the nose, chin and forehead. It also helps the rough, bumpy texture that comes with persistent congestion. Dry and sensitive skin should approach carefully or choose a PHA instead. If you are pregnant or breastfeeding, ask a doctor before adding any salicylic acid product to a routine.
How to use it
Evening, after cleansing and before heavier layers, on dry skin. Start two nights a week and build slowly — most people settle at three or four. Follow with a moisturiser, and wear sunscreen daily, which matters more with any exfoliant in the routine. Do not use it on the same night as a retinoid until you know how your skin behaves.
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🙋 People also ask
What is BHA and what does it do?
BHA, usually salicylic acid, is an oil-soluble exfoliant that can penetrate pores to dissolve oil and dead skin, helping refine the look of texture and blemish-prone skin. In Korean routines it's used a few times weekly, with sunscreen by day, to avoid over-exfoliating.
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.
✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed: 2026-08-23.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.