Mental NRG & N-Durance Matrix - a complex of activating components, affecting concentration and memory, increase exercise capacity (strength and endurance) and eliminating fatigue, prolonged exercise duration and recovery of the organism, containing caffeine, histidine, taurine. Caffeine (a purine alkaloid thermogenic properties) inhibits in the human adenosine receptors, stimulating exercise capasity, fighting fatigue and allowing activation of operation, increasing the exercise capacity and accelerating post-workout recovery. Histidine (amino acid or endogenous) with beta-alanine processed by the muscles into carnosine, a dipeptide which is a powerful antioxidant that allows to improve functional capacity (strength and endurance), and rapid recovery. Taurine (enhances the effects of caffeine) neurotransmitter and neuromodulator, insulin-mimetic improves insulin metabolism, responsible for the transport of creatine into the muscle cells. Mental NRG & N-Durance Matrix is a component of the preparation Serum Muscle by Fitness Authority, available at www.muscle-zone.pl