Man this junk didn't do crap for me except for make things worse. I had way better results with two weeks on retin-a and minocycline. I was breaking out pretty bad and used Differin for three weeks and it just got worse. I would have stuck it out but the break out was unbearable. I used the mino and retin-a combo for two weeks and my skin got way better. Maybe though the differin got me through the breaking out stage and the combo came just when the gettin better stage came. I don't know but I ain't using that stuff again.