During the nineties energy bars gained quick acceptance over homemade and grocery-store alternatives due to their pack-ability, nutritional value, and long shelf life. In a word, convenient. At the forefront of that energy-bar movement was Powerbar and its line of Performance Bars. While most of those energy-bar start ups have quietly disappeared, Powerbar, like one of its sponsored endurance athletes, has soldiered on. This is because Powerbar has continually fine tuned its flavors and formula to ease digestion while providing nutritional benefits for high-intensity athletes. Fore example, each low-fat bar contains 200mg of sodium-based electrolytes to help the body efficiently replenish its water supply. This helps prevent dehydration when exercising or competing in extreme conditions. But, that's just one advantage these energy-bars bring to serious endurance athletes. Through extensive research and development, Powerbar's optimized a glucose to fructose blend with a two-to-one ratio for efficient and long-lasting energy. What they've coined C2MAX, this dual-source energy blend helps supply more energy to muscles than glucose alone. In fact, testing by Med Sci Sports Exerc journal as shown this ratio to deliver 20 - 50 percent more energy to muscles, and improve endurance performance by eight percent. Powerbar Performance Bars ten flavors are free from preservatives and artificial flavors. Each box contains 12 bars.