of caffeine. These are things athletes often take as supplements. Excessive caffeine consumption is not healthy for the body. The History Of Energy Drinks: A Look Back 10 Common Energy Drink Ingredients: What You Need to Know Top Selling Energy Drink Brands - Caffeine Informer Reports identify that a single serving of energy drink contains 80 to 200 milligrams of caffeine. Some energy drinks also contain additives like guarana, which contain large quantities of caffeine. This leads to a caffeine addiction.