Cherry-Flavored Designer Food A Dietary Supplement InnerPower is a Designer Food dietary supplement designed by Life Extension scientists Durk Pearson & Sandy Shaw for their own personal daily use. It offers a delicious and nutritious means of supplementing with L-arginine. This nutrient amino acid, is the subject of hundreds of research studies around the world and is used by world-class athletes, Olympic weightlifters, body builders, and holders of The Guinness Book of World Records. InnerPower is sweetened with xylitol and contains choline and vitamin B5 and now also L-citrulline, magnesium aspartate, and vitamins B6 and B12, along with folic acid, glycine, and betaine.