Twinlab Performance Enhancer Creatine Fuel Stack for power & strength athletes. Each specially formulated Creatine Fuel Stack capsule contains pure creatine monohydrate synergistically combined with cell-volumizing amino acids glutamine and taurine, the two most abundant free amino acids in muscle tissue. Creatine plays an important role in the transfer of energy. In the muscle, it is used to fuel the process of contraction. It is converted to phosphocreatine, which is important for short energy bursts such as sprinting and weightlifting. Depletion of phosphocreatine can result in muscular fatigue and fading muscle power. This product is packaged in a glass bottle for maximum stability, quality and freshness.