COSRX - AshSkin review for The Niacinamide 15 Serum

I have tried 10% niacinamide before but it was my first time trying a 15% niacinamide serum. Even though i was very skeptical in the beginning, i actually ended up liking it. This is the first product that actually helped in fading my older acne scars. There was no purging and no irritation at all too. It also does a very good job in controlling oil and sebum on my t-zone.