NEGL I sometimes swap Ritalin for Caffeine. One pill in the morning and it feels like I just drank 3 cups but it lasts all day and no stomachache/headache.
Waaaay back in college, during a different Age of the World, Ephedrine was legal and available by mail without a prescription. I strongly doubt I would have completed that double STEM major on caffeine alone, and afik Ritalin hadn't been invented yet.
EDIT: But yeah, "with getting things done." I am literally sitting here taking pulls on the coffee as I work (in between sh*tposts). It's like cigarettes; smokers say they need the cigarette for "something to do with their hands". Taking that pull becomes part of my thinking process. (When I'm on a health kick it's icewater instead and ofc I feel 100x better)