Just in general not that hard to get .. for example adderal is a great stimulant but i feel that it’s pretty hard to get, at least in America . Usually need a script or have tons of cash . Meth is a great stimulant but is very easy to end up with consequences - psychosis, and to sum it up , major disruptions to sleep , appetite , and mood. Etc.
most of the workout stims are very short acting and loaded with side effects as we all know .. dmha , dmaa, yohimbine.. try taking them for a daytime boost at the office lol.
Modafinil seems promising but doesn’t work a lot of times for me , and doesn’t give me much drive/motviation .
And part of my definition of effective is not too extreme in the euphoria department (cocaine, mdma, meth) because this takes away from its usefulness for day to day activities when the high is too intense .
These are just my opinions from personal experience. Good batches of Excelsior seemed like one of the most useful, functional stimulants I’ve tried