I've been on this for a year now and yes, it has definitely controlled the oil on my face and it has improved my complexion.......that and also minocycline (and this was before my new skincare regimin which has only increasingly helped!). Since I've had problems w/ redness and too much oil, I have to take these 2 and I can notice a difference if I've stopped taking them a few days. I was unaware of serious side effects. I guess I will have to do some more research to see what some of those might be.