Cosrx CosRx, The Niacinamide 15 Serum, 0.67 fl. oz. (20 ml)

Been using the COSRX Niacinamide 15% Serum for a few weeks now and wow, it really helped lighten my dark spots. My acne marks don’t look as strong anymore and my skin looks more even. The serum feels light, not sticky, and it absorbs fast. I was a bit scared at first since it’s 15%, but I just used it slowly and it didn’t irritate my skin. Super happy with the results so far!

I had been searching for a long time for something that could lighten the dark spots on my face. I tried so many serums, but they only damaged my skin barrier. I'm so glad I finally tried this—it's truly worth it!

If you’re looking to refine texture, control breakouts, and gradually fade scarring—and don’t mind a serum on the stronger side—this is a high-value pick. Just start slow, moisturize well, and monitor how your skin responds.

I've been using CosRx Niacinamide 15 Serum for a few months now, and I'm really satisfied. The high quantity of niacinamide alleviated my breakouts and considerably reduced the appearance of my pores. My skin is more even-toned, smoother, and has a healthy glow I haven't seen in a while! It absorbs quickly, feels light, and blends well with my other products. There is no sticky or greasy residue, which I quite appreciate. A little goes a long way, so the 20 mL bottle lasts longer than I anticipated. If you have oily, dull skin or occasional breakouts, I definitely recommend trying this serum. CosRx nailed this one!

I like this product because it is very effective for me since i have a sensitive and acne prone skin. So the niacinamide ingredient works well with my acne.