I've heard tales of Ritalin. I'm personally a fan of energy drinks and loud music as too much coffee gets in a First World War with my body - it works, but just not in the ways I need it too. Drinking coffee works for speeding up the morning process and nothing else unless I'm smoking and playing guitar at the same time.
I'm not going to be the faggot who tells you to drink water or orange juice and that if you were working out you would feel the natural energy. I'm the faggot who's going to tell you to try channeling energy from other sources, feng shui and chakras.