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COSRX
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A 20 ml serum at 15% niacinamide, a high dose by any standard and the reason the bottle is small. Korean users treat this as a targeted step on the oily zones rather than a full-face daily serum, at least at first.
Who it's for. Oily and blemish prone skin with visible pores. Skin that flushes easily should patch test, since 15% niacinamide can sting on reactive skin.
How to use. After cleansing and toner, apply two or three drops to the face or only to the oily areas, and press in. Follow with moisturizer. Start once a day and see how skin responds.
Key active. Niacinamide at 15%, a vitamin B3 derivative used for oil-related shine, the look of pore size and the appearance of a more even tone.
Sourced in Seoul. This is the Korean domestic SKU, not a reformulated export version.
All orders ship from South Korea. Your order is picked and packed by our logistics partner in Bucheon-si, Gyeonggi-do, then travels to the United States as an international shipment.
Handling 1-3 business days, international transit and customs clearance 7-11 business days. Total estimated delivery 8-14 business days. These are estimates, not guarantees.
Free shipping on orders $120+; a flat $12.99 below that. The $120 threshold applies to your order total after any automatic discount. Product prices do not include U.S. import duties or customs fees, which are billed by the carrier and are the responsibility of the recipient.
You may request a return within 30 days of delivery on unused, unopened items. Returns ship to our facility in South Korea and require a Return Authorization Number, which you must request from us before sending anything.
The full ingredient list (INCI) is printed on the product packaging. These are authentic Korean-market formulations sourced directly in Seoul - the domestic SKU, not a reformulated export version.

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A 20 ml serum at 15% niacinamide, a high dose by any standard and the reason the bottle is small. Korean users treat this as a targeted step on the oily zones rather than a full-face daily serum, at least at first.
Oily and blemish prone skin with visible pores. Skin that flushes easily should patch test, since 15% niacinamide can sting on reactive skin.
After cleansing and toner, apply two or three drops to the face or only to the oily areas, and press in. Follow with moisturizer. Start once a day and see how skin responds.
Niacinamide at 15%, a vitamin B3 derivative used for oil-related shine, the look of pore size and the appearance of a more even tone.
The steps that go with it, added in one click
Routine total
$120.00
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100% authentic
Sourced in Korea from the brands. Never counterfeit.
Ships from Seoul
Dispatched from Bucheon. 8-14 business days to the US.
Free shipping $120+
Flat $12.99 under $120. Import duties not included.

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