# COSRX The AHA 2 BHA 2 Blemish Treatment Serum

AHA BHA blemish treatment serum, with Glycolic and Salicylic Acid.

- Brand: COSRX
- Product: The AHA 2 BHA 2 Blemish Treatment Serum
- Price: $26.99
- Availability: Out of stock
- Market: Korean market, the version sold in Korea
- Made in: Republic of Korea
- EAN (barcode): 8809598455696
- Category: Serums & Ampoules

## Key benefits

- Glycolic acid is the AHA on the list; salicylic acid is the BHA.
- Neither acid carries a declared percentage on this bottle's own ingredient list.
- Sodium hyaluronate and allantoin sit further down for a calmer feel.
- Dipotassium glycyrrhizate, a licorice-derived ingredient, rounds out the calming base.

## How it works

An acid serum is the one step in a routine that should not be doubled up, and this one carries two acid types at once: glycolic acid and salicylic acid, with gluconolactone behind them. It goes on in the evening after cleansing, before moisturizer, on skin that is dry rather than damp. Zinc PCA, allantoin and dipotassium glycyrrhizate are on the same list, which is what keeps a short acid formula wearable. Skin that looks congested and marked in the same places is the case it fits. Two or three evenings a week to start, and sunscreen the next morning is part of using an acid at all.

## How to use

1. Use the AHA 2 BHA 2 Blemish Serum in the evening, after cleansing and before moisturizer.
2. A thin layer over the areas that want it, or the whole face, kept clear of the eyelids and lips.
3. Wait a minute, then follow with a plain moisturizer the same evening.
4. Two or three evenings a week to start. Do not use it in the same routine as another acid or a retinoid.

## Ingredients

Water, Propanediol, Polysorbate 20, Glycolic Acid, Salicylic Acid, Gluconolactone, Zinc PCA, Allantoin, Sodium Hyaluronate, Sodium Hydroxide, Dipropylene Glycol, Hydroxyacetophenone, Caprylyl Glycol, Ethylhexylglycerin, Dipotassium Glycyrrhizate, 1,2-Hexanediol, Disodium EDTA

## FAQ

### What do the numbers in AHA 2 BHA 2 actually refer to on the ingredient list?

Glycolic acid sits fourth on this serum's list and salicylic acid fifth, right after the base solvents, on a comparatively short list of only seventeen entries. Neither acid carries a declared percentage on this bottle's own ingredient panel, so the numbers in the name are not something we can confirm as an exact concentration. What is confirmed is that both acids sit high on a short list, ahead of the calming and hydrating ingredients that follow.

### Is this too strong for skin new to chemical exfoliants?

Glycolic acid and salicylic acid both sit near the front of the list, which is a real signal that this is formulated as an active exfoliating treatment rather than a gentle everyday serum. Zinc PCA, allantoin, sodium hyaluronate, and dipotassium glycyrrhizate follow to offset some of the dryness acids can cause. Anyone new to combining an AHA and a BHA in one product should start with a thin layer a few nights a week rather than applying it nightly from the start.

### Will blemishes clear up after one use of this serum?

Exfoliating acids work by encouraging surface turnover with repeated, spaced-out use, not by clearing a blemish after a single application. Gluconolactone, a gentler PHA-family ingredient, sits alongside the two acids and supports the same gradual resurfacing process over time. Using it consistently a few nights a week and watching how skin responds over several weeks is the realistic way to judge whether it is working.

### Can I apply moisturizer right after this serum?

Yes, applying a moisturizer afterward is standard practice with an acid treatment like this one, since sodium hyaluronate on this list only partially offsets the drying effect glycolic and salicylic acid can have. Nothing here is known to conflict with a standard moisturizer or sunscreen used in the same routine. Avoid layering it the same night as a separate strong acid or retinoid product, since stacking actives raises the chance of irritation.

### How do I verify this serum is the genuine Korean-market formula?

This bottle's own barcode, 8809598455696, is a real EAN tied to this exact product, so checking that number against your packaging is a useful first step. COSRX additionally verifies units through its own system: enter the batch number and expiration date printed on your unit at the checking page on cosrx.com, read directly from the box itself. Combining the barcode check with the batch verification is the more complete way to confirm authenticity.

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Page: https://korean-pharmacy.com/products/cosrx-the-aha-2-bha-2-blemish-treatment-serum