I purchased the Salicylic acid and Glycolic peels . I use the one for help with my menopausal acne and I must say it works!!! After about 2 weeks I saw a vast improvement on my chest area and also face . I followed their instructions and wait 30 mins on both peels before I apply to freshly cleansed skin . The Glycolic is taking longer to see results in regards to pigmentation but I am only a month in so will judge after about 3 months . But as an exfoliator its fab... my skin after the 15 mins on feels soft and smooth. I would say it does dry the skin a bit however I expect that due to the exfoliation level and use more hydrating products to help this at bedtime. Overall I am happy.Will rebuy due to how easy this is incorporate into my routine at night that actually works. But again I think I need to be patient to see maximum results. One thing though I do think is they should offer a set with one brush as an option when purchase either of these acids . I stupidly bought one and wish I bought another brush as well but postage too much just to order one brush