Been mucking around with huge doses of B Vitamins (especially B3/Niacin) and 5-HTP (a serotonin precursor). Both of those are rather, uh, effectful. 500mg+ Niacin will turn you red unless you're actually deficient. And you do not want to mess with the 5-HTP and alcohol at the same time, plus 5-HTP can cause some nasty side effects in some people.

Seems like a nice way to have some weird dreams while probably improving my health (high dose B vitamins seem to do great things for mental disorder and the only apparent downside is colorful piss and possibly turning into a cherry).

For people who don't do vita-drugs, there's always tea, coffee, chocolate, and matcha.