Green tea awakens good spirits and wise thoughts. If you are depressed, it will reassure you. With these inspiring words, the legendary Chinese emperor Shennong already described the many positive properties of the active ingredient theanine, which is contained in the leaves of green tea in a natural concentration of about 2 - 5%. NeuroTeyanin is the purely natural L-theanine extract from green tea (Camellia Sinensis) in a highly concentrated form. Invigorating, mood-lifting and concentration-enhancing without tiring. Neuroteyanin - the stimulating amino acid from the green tea plant: the mental and physical concentration and relaxation agent.