You mean like PCA, TCA etc? Majority of medical grade peels are not available for non professionals. I would not recommend using them on your own because application matters - you have to do it quick, usually it's better if someone applies it and controls the entire process. Last time I did medical peel, we had to check time to make sure we apply the peel in 3 minutes max. You have to protect broken skin with vaseline or other solutions - depends on what product says. You also should have neutralizer and water. With downtime - it depends on skin, sometimes you have to shorten the time, my friend used one acid one minute too long and it turned out that one of our friend had to help her in her own salon since she needed some products to calm the skin