A low, daily-use dose of AHA and BHA in willow bark water — exfoliation you can use nightly.
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Most acid toners are water with acid added. This is built on willow bark water, a natural source of salicylates, so the exfoliating character runs through the base. That is what makes it mild enough for regular use rather than something you brace for.
Watery and quick to absorb with no residue. Little to no tingle on healthy skin, which is the point of a daily-strength formula.

The base of the formula and a natural source of salicylates, giving a gentle BHA character throughout rather than in a single spike.

At low dose. AHA works on the surface, BHA inside the pore - the pairing pore-focused products almost always use.

Provitamin B5, offsetting the dryness that follows regular exfoliation.
COSRX's AHA/BHA Clarifying Treatment Toner sits in the useful middle ground of chemical exfoliation.
Most acid products are either weekly peels - strong, provoking, and only occasionally used - or so mild they do nothing at all. This is built for regular use, and the base is why. Willow bark water replaces plain water as the foundation, and willow bark is a natural source of salicylates, so a gentle BHA character runs through the formula rather than arriving as a single spike of acid.
On top of that sit low doses of AHA and BHA. AHA works on the skin surface; BHA is oil-soluble and reaches inside the pore, which is why pore-focused products pair them. Panthenol offsets the dryness that follows regular exfoliation.
Apply after cleansing with hands or a cotton pad, before serums and moisturiser. Start every other day and build to daily. Sunscreen the following morning is essential.
Willow bark water as the base rather than plain water is a formulation choice that shows - it is where the salicylic character comes from, gently, and it is why this reads as a daily treatment rather than a weekly peel.
Willow Bark Water, Apple Fruit Water, Betaine Salicylate (BHA), AHA
After cleansing, sweep over the face with a cotton pad or press in with palms. Start once daily and build to twice if comfortable. Use sunscreen daily.
After cleansing, sweep over the face with a cotton pad or press in with palms.
Start once daily and build to twice if comfortable.
Use sunscreen daily.
Different approach entirely. A peel is a strong occasional intervention; this is a low dose used regularly. For congestion, consistency generally outperforms intensity.
Hands waste less product and are gentler. A cotton pad gives a light physical sweep, which some people prefer on congested areas - either works.
Yes, and it is a common COSRX routine - this first, then the essence. The essence buffers the dryness the acids cause.
It helps keep pores from refilling with regular use. Existing blackheads need consistent BHA exposure over weeks; nothing clears them in a single application.
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