1 Before. 2 During. Fuel for optimum performance. For more information call 1-800-587-6937 (8-8 ET). www.PowerBar.com. 100% recycled fiber. PowerBar Performance Energy bars help meet the fueling needs of athletes competing at the highest levels of exercise intensity and duration. This bar is formulated with PowerBar C2Max dual source energy blend and 200 mg sodium - a key electrolyte lost in sweat that is associated with muscle cramping in some athletes. You're stronger than you think.