Protein supplementation is absolutely essential for any hard training athlete to maintain, repair, and grow lean muscle mass. Hammer Whey, ideal for supporting your immune system, as well as enhancing recovery between workouts and races, helps you obtain the full amount of protein you need daily. Whey is the most easily assimilated of all proteins and is packed with a tremendous amount of naturally occurring branched chain amino acids. Hammer Whey also contains high amounts of other recovery specific amino acids and is glutamine fortified for immune system support. Hammer Whey is 100% whey protein isolate, not the usually found concentrate, so you get more actual protein per serving and less lactose and fat. Serious endurance athletes need protein far above the normal adult RDA, so make sure you always have Hammer Whey on hand.