Complex increasing concentration is restricted by the manufacturer, is designed to improve concentration, focus and memory, containing stimulating substances and influencing the levels of neurotransmitters. The complex contains: L-tyrosine (which is a precursor of dopamine and norepinephrine affecting the nervous system, circulatory, intensifying glycogenolysis and lipolysis), acetyl-tyrosine (an amino acid involved in the synthesis of neurotransmitters and hormones), choline bitartrate (precursor of acetylcholine) and β-phenylethylamine (neuromodulator). In the sports supplementation used in sports that require concentration skills and memory. The complex available at www.muscle-zone.pl