My understanding is that stimulants alleviates ADHD symptoms. That meth is a type of stimulant. And that specialized ADHD meds are based off of meth (according to my nurse mom and sister).

But also, I am being intentionally hyperbolic for the purposes of comedy.

Meth. Anything less will only result in eventual and catastrophic failure. Source: I have ADHD and have tried everything else, several times over.