The AHA BHA PHA LHA 35 Peel

For a decade, COSRX has been the brand that whispered where others shouted. The BHA Blackhead Power Liquid. The AHA Whitehead Power Liquid. These were products that said trust the process, be patient, gentle daily exfoliation will get you there. And then, in late 2023, COSRX walked into the room with a pink gel containing 35 percent acid and essentially said: actually, sometimes you need to turn the volume up.

The AHA BHA PHA LHA 35 Peel is a four-acid chemical peel that does not pretend to be anything other than what it is — a serious exfoliating treatment for people who know what they are doing with acids. The 35 represents a combined acid concentration that includes nearly 28 percent AHA (glycolic, lactic, mandelic, and citric), 5 percent PHA (gluconolactone), 2 percent BHA (salicylic acid), and a trace 0.02 percent LHA (capryloyl salicylic acid). Each acid type operates at a different molecular size and solubility, and together they create something genuinely compelling: multi-depth exfoliation that addresses the skin surface, the mid-stratum corneum, and the interior of pores simultaneously.

Glycolic acid, the smallest and most penetrating AHA, drives the deep resurfacing. Lactic acid provides broader, more even exfoliation with added humectant properties. Mandelic acid, with its larger molecular size, contributes antimicrobial action and gentler surface-level peeling. Gluconolactone exfoliates while moisturizing. Salicylic acid dives into the oil-filled pores where water-soluble acids cannot follow. And capryloyl salicylic acid — the LHA that earns this peel its fourth initial — is even more lipophilic than standard salicylic acid, targeting the deepest part of the sebaceous follicle. The theoretical framework is elegant. Each acid has a job. Together, they cover the full depth of what chemical exfoliation can address.

In practice, you feel the 35 percent working. Apply the distinctive pink gel to clean, dry skin and a tingling begins almost immediately, building to a mild sting that peaks around the second or third minute before stabilizing. This is not uncomfortable for anyone experienced with acid products, but it is unmistakable — your skin is being actively exfoliated, and it wants you to know. First-time users should start with three to five minutes and work up to the full ten. Pushing through discomfort is not bravery; it is barrier damage waiting to happen.

After rinsing, the results are gratifyingly immediate. Skin feels polished — not raw or stripped, but genuinely smoother, as if someone has carefully buffed away a layer of dullness that you had stopped noticing was there. The complexion looks brighter and more even. Pores that were clogged feel clearer. Over the course of four to six weekly sessions, the cumulative effect is significant: improved texture, reduced congestion, more even tone, and a clarity that daily-use acid products take much longer to achieve.

The formula earns additional points for what it includes alongside the acids. Panthenol, listed eighth in the INCI — high for a supporting ingredient — provides meaningful barrier repair and soothing during the peel process. Cyanocobalamin, the vitamin B12 responsible for the gel’s natural pink hue, contributes skin barrier support without artificial coloring. Allantoin soothes. Hydrolyzed hyaluronic acid provides humectant action. These are not afterthoughts; they are deliberate formulation choices that make the difference between a peel that leaves skin feeling punished and one that leaves it feeling renewed.

The packaging is the product’s weakest element. At thirty milliliters, the bottle is small — roughly eight to twelve applications at once per week, giving you two to three months of use. Multiple users have reported leaking issues with the closure mechanism, which is a genuine concern for a product containing high-concentration acids. A more robust, possibly airless pump format would better serve both the formula’s stability and the user’s bathroom counter.

At nineteen dollars, the price per bottle is reasonable, but the price per use — roughly one-fifty to two-fifty per session — is higher than it initially appears for a K-beauty product. That said, comparable multi-acid peels from Western brands typically cost forty to sixty dollars for similar volumes, so COSRX’s positioning remains aggressive on value.

This peel is explicitly not for everyone, and COSRX deserves credit for saying so clearly. If you are new to chemical exfoliation, this is not your starting product. If you have rosacea, eczema, or a compromised barrier, this will make things worse before it makes them better. If you are pregnant, the salicylic acid content warrants a conversation with your doctor. This is a product for people who have spent months building acid tolerance and are ready for the next level — and for those people, it delivers a genuinely professional-grade experience at a fraction of the price.

COSRX’s decision to make this product feels like a statement of maturity. The brand is saying: we are not just the gentle daily-acid company anymore. We can formulate at the high end too. The AHA BHA PHA LHA 35 Peel proves the point convincingly. Just make sure your skin is ready for the conversation.

Formula