5 Hour Energy is lighter, more portable, faster acting and longer lasting, quickly became the no nonsense way for working adults to stay focused and productive. It"s packed with b-vitamins for energy and amino acids for alertness and focus. There is zero sugar, zero herbal stimulants, and only as much caffeine as a cup of premium coffee. The two-ounce energy shot takes just seconds to drink and in minutes you"re feeling bright and alert. And that feeling lasts for hours.