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COSRX
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A 20 ml serum at 23% pure L-ascorbic acid, one of the highest concentrations sold at retail in Korea and the reason it comes in a small opaque bottle. L-ascorbic acid is unstable in light and air: it will darken over time, and once it turns deep amber it is past its best. It stings on first use for most people.
Who it's for. Skin already used to actives, dealing with dullness and the appearance of uneven tone. Not a starting point, so begin with The Vitamin C 13 if this is new to you.
How to use. Start two or three times a week. Three or four drops after cleansing and toner, avoiding the eye area; a slight tingle for a minute or two is expected. Follow with moisturizer. Store cool and dark, keep the cap tight, and use broad-spectrum sunscreen daily.
Key active. L-ascorbic acid at 23%, the pure form of vitamin C, an antioxidant used for the appearance of brightness and 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 23% pure L-ascorbic acid, one of the highest concentrations sold at retail in Korea and the reason it comes in a small opaque bottle. L-ascorbic acid is unstable in light and air: it will darken over time, and once it turns deep amber it is past its best. It stings on first use for most people.
Skin already used to actives, dealing with dullness and the appearance of uneven tone. Not a starting point, so begin with The Vitamin C 13 if this is new to you.
Start two or three times a week. Three or four drops after cleansing and toner, avoiding the eye area; a slight tingle for a minute or two is expected. Follow with moisturizer. Store cool and dark, keep the cap tight, and use broad-spectrum sunscreen daily.
L-ascorbic acid at 23%, the pure form of vitamin C, an antioxidant used for the appearance of brightness and even tone.
The steps that go with it, added in one click
Routine total
$125.00
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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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