I have adult acne and through much trial and error have found a regimen that works for me: 4% BP gel in the mornings and 2% SA at night, along with a good hydrating moisturizer. Since these acne products increase cell turnover and exfoliation, I was wondering if extensive use could lead to premature aging of the skin. One of the components of aging is mutation via repeated DNA replication. The more times your body makes copies of its cells, the higher the chance of a mutation occurring and a less-than-perfect copy being made. So, does it follow that BP and SA, by increasing skin cell renewal, would hasten the aging process? I can't find anything about this in the literature, only a few other public forums with what I think is scare-mongering about free radicals. Could you clarify the risk and point me to any studies done on the subject?