As far as I know, Adderall for people without ADHD induces the self-perception of higher performance, yet increase in performance isn’t actually statistically noticeable, so it might be useful for someone who feels emotionally stuck (afraid of failing, tired), but not for someone who does not have the capacity to do well, much like caffeine only gives you the self-perception that you’re less tired than you actually are.
The typo will stay.