If you are serious about building lean, strong muscle, Sci-MX®’s flagship protein product is a must! GRS-5 Protein System® is a new generation, scientifically formulated protein drink designed to supply a sustained release of proteins for longer periods that ordinary protein. When subjected to weight or conditioning training, muscles grow in size and strength more effectively if constantly supplied with amino acids over a gradual period. Immediately after exercise, muscles require rapidly metabolised proteins like whey protein isolate and concentrate. GRS-5 contains optimum quantities of both. For the periods in between training sessions, meal times and during sleep, muscles continue to repair themselves, and this is when gradually absorbed proteins are best. So in addition to whey protein, GRS-5® also contains gradually released proteins from milk, egg white and soy which together with work in synergy with a complex enzyme package called OptiZyme™, which increases the uptake of BCAA’s (branch chained amino acids) and free form amino acids. The addition of Aminogen®, a breakthrough US patented compound which has proven in clinical research to increase BCAA release by up to 250%, and boost nitrogen retention by 32%. Essential amino acids and a vitamin package designed to aid the metabolism of protein complete GRS-5® as the ultimate choice for anyone serious about muscle size and strength. GRS-5 Protein System® is virtually carbohydrate free so as to promote fat loss and encourage leanness and muscle definition. It is also delicious and mixes easily with water into a creamy and satisfying shake.