Maxler bars have been designed with one goal in mind: to deliver quality nutrition to any athlete on the go in the most convenient form. Different types of sports nutrition bars contain varying levels of protein, carbohydrates, fat, and sugar, depending on the intended goal. Protein bars provide high protein to help support lean muscle and an active lifestyle. L-Carnitine bar will boost your energy, promote fat metabolism and support appetite control. Bars are meant to replace a meal, or can be a healthy, low-calorie snack.