Introduced in 2004, 5-Hour Energy is the original two-ounce energy shot. Despite dozens of imitators, it is still number one – by a wide margin. Why? Because it works. Me-too energy shots try to fool you with sugar and herbal stimulants, but 5-Hour Energy gives you a proven blend of B-vitamins, amino acids and essential nutrients to keep you going strong. It has zero sugar, zero herbal stimulants and only four calories.