Its methylated 1-AD. It doesn't act like either Methyl 1-T, 1-T, or 1-AD in its effects(Its a Methyl 1-A clone with a few additives). Honestly, this is a great compound for strength gains(to the point where you try and be a bit careful while lifting, so you won't injure yourself). Weight gains are marginal, with the highest repoted gains being 12lbs by a newb(most experienced users net around 5-7lbs). I used to be involved with EST, so while I haven't ran this one, I'm more than a little familiar with it. Most users experience sides comparable to Pheraplex, but there have been a few that have said it was worse than superdrol for them.