Energizer, as its name suggests, is a soft drink that has energy-giving properties, and usually people, especially teenagers, young people and athletes, consume it when they need more energy. These soft drinks are used to increase the body's energy. The amount of energy (measured with a calorimeter) in this type of soft drinks has been reported at a higher level compared to other soft drinks such as juices, colas and isotonic sports drinks. For example, the amount of energy in isotonic sports drink is equal to 26 kilocalories per 100 milliliters, while it is reported between 43 and 50 kilocalories per 100 milliliters in energy drinks. Another important feature of these soft drinks is the use of stimulant compounds such as caffeine and taurine in their formulation.