I’m wondering if there are any (non-prescription, OTC, not controlled substances) that have effects similar to that of caffeine. By scientifically-accepted, I mean “have been clinically proven to enhance alertness/quicken heartbeat/act as a general stimulant”.
I am not interested in the least in unsubstantiated claims that whatever herbal “remedies” will do it for me. Nor am I interested in suggestions to try getting more sleep (I would if I could), nor yoga/meditation/etc (because if I can’t gulp it down on my way to class, it’s useless to me). So far everything I’ve found has fallen into the above categories, and I’m tired of giving so much of my money to whatever company makes Tums.