An oily, acne-prone user with old scars saw improvement in scars and discolouration from the COSRX Niacinamide 15 Serum without irritation or redness.
“I used Cosrx Niacinamide 15 and I saw improvement”
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Older than 36 months. These may describe an earlier version.
A user finds the COSRX Niacinamide 15 Serum great but a little expensive.
“The COSRX Niacinamide 15% is great, but I think it's a little expensive.”