Pro-hormones are basically steroids that haven't been converted by an enzymatic reaction yet, for example the popular Andro will convert into Nor-testosterone. They work well, take a toll on the endocrine system and take a toll on the liver also, as well as turn up the Blood pressure raise triglyceride levels. I took superdrol one week, by the second by my BP was 145/93...after just being 120/80 which is perfectly normal. they are also methylated which wil make your liver have to work harder to break of of that methyl bond, he's taking 3 methylated steroids...not good at all.