Even Adderall use (which I haven't tried) eventually has side effects and physiological costs (as well as immediate costs in terms of creativity for many users).
It would be neat if there were a way to cheat the rules about how much the average person can produce in their lifetime. I think many of us have a tendency to look towards extraordinarily productive people and want to try to match their output. But, either they seem to have won the genetic lottery which allows them to get away with things that other mere mortals cannot, or they eventually pay the price in insanity or exhaustion or early demise.
I'm starting to come around to the idea that the best possible productivity "hack" is healthy living and a laser-like focus on just one or two projects at a time, and delegate everything else.