The Cosrx BHA was the first active I ever used so I really wasn't sure what to expect. I was afraid it would make me purge or that it would dry out my skin too much but nope this BHA is actually very gentle (at least on my oily, not sensitive skin). I've even used it twice in one day on a few occasions and it still never dried out my skin or made me break out. Since I began using this product my skin has become much smoother, more even looking, my pores and sf are not as clogged up as they used to be. Unfortunately I still do get minor pimples from time to time and my pores do tend to get a bit clogged up especially in my chin area but nothing like before.