I don't believe Differen contains Glycolic Acid although, i'm not 100% sure but, it has some of the '' peeling '' effect.. and i know that the Glycolic acid kind of does the same thing so, i feel like i'm '' double peeling '' my skin, if that makes any sense? Sometimes the Glycolic Acid feels like it's burning certain spots but, it dosen't look effected so, i'm not sure.