USN Core Series Testo Tribulus Male Performance Aid 100 CapsulesUSN's Fast Grow Anabolic contains a scientifically researched premium 4 Stage Protein Matrix for both slow and fast release as well as a 2 stage Glyco Matrix Carb System to aid in sustainable energy and storage of glycogen. The addition of our Creatine Stack, Alanine and Taurine may improve endurance and performance. Glycine, an amino acid has been added to improve strength, increasing mass building and muscle strength.