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But even 40 mg of caffeine â about the amount in a cup of tea or a can of soda â will give most people a subtle boost. In fact, many people can detect the effects of just 15 mg of caffeine, about the amount in a single sip of strong coffee or a large cup of decaf.
Energy drinks are supposed to do just what the name implies -- give you an extra burst of energy. As it turns out, most of that energy comes from two main ingredients: sugar and caffeine. A typical energy drink can contain up to 80 milligrams of caffeine (about the same amount as a cup of coffee). By comparison, a 2006 study found that the average 12-ounce soda contains 18 to 48 mg of caffeine.