Dietary Supplement. New. Premium formula designed for men who exercise regularly. Fuels lean muscle with 10g of protein*. Supports recover with L-glutamine*. Electrolyte replacement to fuel performance*. 1000 mg of L-arginine to boost nitric oxide*. Promotes energy and metabolism* Dr. Frank L Costa, M.D., an internationally acclaimed urological surgeon and mens health expert, is of the GNC Medical Advisory Board. One of "America s Top Physicians," Dr. costa lectures nationally and internationally on men s health topics. .