Ephedrine is a schedule 3 banned substance in the USA. It was abundantly put in fat burner supplements which were abused causing enough deaths for the DEA to ban it.
Basically people were misusing it...
If used correctly... like
24mcg's daily with 200-250mg's of caffeine and perhaps 100mgs of asprin (although iv'e never used asprin with it ).
Pros: Good focus, mood, alertness, fat burning qualities.
Cons; used for making meth, body becomes slightly addicted/Dependant if used for an extended period of time.
Because it's schedule 3 substance I won't tell you where to find it, but google can be your best friend.
It's also legal in Canada as a nasal decongestant, so with that said google away !
gl
peace