This this skin peel 4000 is not the same as it was back in the 1990's back then it was call super shelling and I mean it gave a deep shelling peel. Around the year 2000 or later I order the 4000 peel thinking it would give the same peel has the super shelling I thought they had just change the name! Boy was I wrong" it hardly work at all no strong deep burning like the super shelling my face was almost black after using this super shelling that's what kind of a good peel I got! I'm just saying they have made the product weaker! But even after that super shelling peel on the face, after about a month or two the problems i tried to get rid of was back like before! So don't waste your money!