I'm currently in love with this, seriously. The first time I applied it, I was a bit scared as I knew it would burn a little. It did, actually, and my face was red 20 minutes after applying it. However, the redness and burning feeling went away quite quickly, nothing to worry about! I've been using this for a while, twice.a week, with no negative consequences. Some minutes after applying the product, I can feel some blackheads on the surface of my skin, so yes, it's working. I've noticed my pores look different, though it's too soon to give more details. In general, I love it.