Above all, however, it is used as a stimulus for gaining muscle mass, as well as for increasing strength and endurance. This use, however, is widely criticized by health professionals. It is used by athletes seeking faster gains in muscle mass. Through this supplement, the athletes seek to influence their endocrine system to optimize performance and muscle gain from training. It is an amino acid supplement; its role in the endocrine system of humans has been clarified, so that previously unknown functions are slowly clarified. Some of these functions, as we will see that it may be suitable for consumption among athletes and bodybuilders in general.