it works [SEP] i originally thought this was a counterfeit product because after the first use it did not tingle or have a slight burn like other glycolic acid products i have used i even reviewed it badly i am now editing my review to say that the second time i used it tingled a lot you know that slight burning feeling i used it the next or days and my face started to flake so i took a break now i only use once a week it will literally exfoliate your pimple scars off but use with caution it can be irritating until your skin gets used to it i do not like the flaking but that is a small price to pay for clearer skin