I have been using Epiduo for probably a couple of months now. I was using a different type before, and I have to say, that Epiduo does work better than the one I was using. I put the Epiduo on right before I go to bed every night. But I only use it when I have acne on my face. I never use it just to use it to try and prevent acne. I put it on before I go to bed and usually overnight it will dry out your acne, which is good. Usually it makes the redness of my acne go down as well. There are some times where it doesn't work as well. For example, if I'm on my period that week, it tends to not work as well for some reason. I don't know if that's just because my acne always gets worse when I'm on my monthly friend or what. But it still does a decent job in getting rid of my acne. Just doesn't seem as powerful as it is when I'm not on my monthly friend. Epiduo works pretty fast and pretty well and efficient compared to other brands that I have experienced with so I would definitely recommend it to teenagers as well as adults.