5-Hour Energy Drinks provides a boost of energy and mental alertness that lasts for hours ? with no crash. That?s because 5-Hour Energy is packed with B-Vitamins, enzymes and amino acids. It contains zero sugar, zero net carbs, and just enough caffeine to get the ball rolling. 5-Hour Energy Drinks go where you go. Instead of a big can, it comes in a little 2-ounce bottle you can carry anywhere and drink anytime. It fits neatly into pockets, purses, lockers, desk drawers or backpacks. For maximum energy drink the whole bottle at one time. For moderate energy, drink half the bottle or less then screw the cap back on the save the rest for later.