COSRX The Alpha Arbutin 2 Discoloration Care Serum 50ml

From Post-Breakout Marks to Dullness: Targeted Care with 6 Active Ingredients

If you're dealing with lingering marks left behind after breakouts or patchy hyperpigmentation, this is for you. Formulated with 2% Alpha-Arbutin at its core, plus 3% Tranexamic Acid, 5% Niacinamide, and 2% N-Acetyl Glucosamine (NAG)—all brightening functional ingredients at meaningful concentrations. Ferulic Acid and Glutathione join forces to create synergy, addressing hyperpigmentation at multiple stages for comprehensive, multi-dimensional care.

Changes Confirmed After 4 Weeks of Use

In a clinical study conducted on 20 adult women, significant improvements were observed.
- 20.47% reduction in surface melanin levels
- 22.31% improvement in visible, long-standing dark spots

Non-comedogenic tested and clinically tested on sensitive skin for primary irritation, so even acne-prone skin can use it with confidence.

A Soothing Formula Designed for Sensitized Skin

Just as much attention went into calming care as into high-performance brightening. Five types of Hyaluronic Acid, Panthenol, Madecassoside, Allantoin, and Tocopherol gently soothe skin sensitized by breakouts. The watery, low-viscosity texture absorbs quickly and finishes without stickiness, making it easy to use year-round regardless of skin type. After cleansing and toning, apply an appropriate amount and smooth over the face. For areas where marks are a concern, layer 2–3 times for targeted care.

After toner, before cream — in the serum step

After cleansing and toning to prep your skin, apply this serum before your moisturizer. Its watery texture absorbs quickly and helps the next layer — whether cream or hydrator — adhere more seamlessly. If you're layering with a booster serum, go in this order: booster → this serum → cream.

Safe for morning and evening use

Tranexamic acid, niacinamide, and alpha-arbutin are all low in photosensitivity, so you can use this serum day or night. That said, if you apply it in the morning, always follow with sunscreen to help prevent UV-induced hyperpigmentation.

1–2 dropper presses is all you need

Dispense 1–2 dropper presses into your palm and smooth over your entire face. Pat gently to absorb, avoiding the immediate eye area. For areas with post-breakout marks or stubborn dark spots, layer 2–3 times for targeted care. The lightweight formula sinks in without any sticky residue.

Recommended pairings by skin concern

• For post-breakout marks: Calming toner → this serum → lightweight hydrating cream for gentle, irritation-free care
• For overall dullness: Alternate with a vitamin C serum — use vitamin C in the morning and this serum at night
• For dryness: The formula includes 5 types of hyaluronic acid, but sealing it in with a rich moisturizer will give you even more hydration

What to know when using high-strength niacinamide

This serum contains 5% niacinamide, so if you have sensitive skin, start with a small amount to test your tolerance. It's non-comedogenic tested and dermatologist-tested on sensitive skin, but if you experience redness or discomfort, discontinue use and consult a dermatologist. After each use, wipe the dropper clean before closing to keep the formula hygienic.

Product ingredients list.

The list of ingredients is subject to change. Please consult the packaging of the product purchased.