5 hour energy is not that great. first of all, it tastes like concentrated shit. i know this cause i knew this girl who worked for the company/was sposored by it, and she gave us a full case of the stuff (about 500 bottles). it contains mostly vitamin b12 and niacin, my buddy took 7 of them, and just about died, its some crazy stuff. from my personal experience, it gives you energy, but takes away all of your concentration. ive tried using it for running races, and i couldnt keep my focus up to run fast. the best use i found for it was when i went skiing at 3:30am before school, i would take 2 bottles and a liter of mountain dew, and i wouldnt be tired until lunch, where i took 2 more, and cruised through the rest of the day. so, my conclusion, its good for partying, and staying awake, but not much else.