Used it for 7 weeks now, purchased it in Nov. It had no effect for me. I used it on acne ice pick scars and it`s not even close to a real peeling effect. Yes, indeed I used the 40% glycolic one, and not the 60%, but it should have had an effect so far. The only + is that after you use it your face is very luminous and clean for 1-2 days. Overall it worth spending an extra £100 once every 6-7 weeks for 2 sessions of peeling.