GNC AMP Mass XXX (9 Servings) is a science-based gainer supplement. It has the right balance of carbs, high-quality protein, and other nutrients to help achieve maximum gains. The foundation of Amplified Mass XXX provides a ration of nutrients that helps accelerate increases in lean mass and exercise performance. Miconized amino acids are one which are pulverized into small particles to facilitate faster absorption. These key amino acids including glutamine, leucine and arginine, all support muscle protein synthesis and other key processes crucial to gaining mass. GNC Whey Proteins are World Anti-Doping Agency (WADA) Approved and Informed Choice Certified.Products bearing this logo have been tested for banned substances.