COSRX The Vitamin C 23 Serum

COSRX The Vitamin C 23 Serum is a serum with a good ingredient blend and a high concentration of Vitamin C.

I am very satisfied with this product because it has a great whitening effect when applied consistently.

However, depending on your skin condition, there may be days when it feels tingly and irritating, but it is fine if you moisturize sufficiently on those days :)