Fast Energy with C2 Max Dual Source Energy Blend. No artificial flavors, colors or preservatives. Good Source of Vitamin C. PowerBar Energy Gel Blasts are a great choice for use before or during moderate and high-intensity exercise. They're formulated with C2 MAX dual source energy blend for more energy to muscle. In fact, C2 MAX was designed to have the same blend of energy sources found in breakthrough studies to deliver 20-55% more energy than glucose alone, and in another study to improve athletes' cycling times by 8%.