Adderall? LSD? Meth? Atomic coffee? This is all useless piece of shit.
MEET THE ADRENALINE INJECTOR!
This is the most badass and OP drug here. The only drug which can be used to get maximum 250 stimulation, which means you get, like, +37 INT and the same for PER. Just by using three of those injectors you can pretty much learn everything inside a library in lesser than 1 hour.
Moreover - you never get addicted to adrenaline.
Moreover - this drug is pretty easy to craft.
Moreover - the effect is very long lasting.
Moreover - can be flushed by Blood Filter CBM
Moreover - every component in craft is renewable (including syringe which is returned when you use this), allowing you to make craploads of them.