Anecdotally, my own experience: Scored "introvert" on many "tests", but I've never fared well with caffeine. Sometimes it works but it feels like playing a roul

Anecdotally, my own experience: Scored "introvert" on many "tests", but I've never fared well with caffeine. Sometimes it works but it feels like playing a roulette game. Tends to put me out of focus instead of helping me focus, and often leads to paranoia for me.