not so impressed [SEP] i bought this lactic acid for my husband who has a small dark spotwell he used it times and he broke out exactly on the spot where he put the product i am sure it was the lactic acid that made him break out because he was putting it only on that spot and the zit popped only on that spot he usually does not get random zits on his face very disappointing i wish i could contact skin laboratory but seems like their contact page does not workwell if you see this review please contact me i am extremely disappointed by your product and would like to send it back for a refundupdate peeling went wrong i do not have sensitive skin cannot imagine what it would have done to someone else be careful powerful stuff