system
A chat on subreddit /r/wallstreetbets
human
Or just get a script so you can take it when you want. Also L-amph isn't active on the CNS so it causes no desirable effects.

gpt
l-amphetamine is certainly active in the CNS and had its own brand name marketed solo - Cydril. It is still a potent catecholamine releaser, but is only 1/3 as potent as d-amphetamine.