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

I’ve been using COSRX The Niacinamide 15 Serum for several weeks, and it’s become one of my favorite serums. I have oily, acne-prone skin, and I noticed that my skin looks less greasy throughout the day and my pores appear smaller. The serum feels lightweight, absorbs quickly, and layers well with the rest of my skincare routine without feeling sticky. I also noticed that some of my post-acne marks started fading gradually, and my overall skin tone looks more even. Since it contains a high concentration of niacinamide (15%), I started using it a few times a week before building up to daily use, which worked well for my skin. The only downside is that people with sensitive skin may need to introduce it slowly to avoid irritation. Overall, I’d recommend it to anyone looking to reduce oiliness, improve skin texture, and help with acne marks. I’d definitely repurchase it.