The main function of amino acids in the human body is the formation of protein complexes. At the genesis of protein amino acids are used up to 22, which are therefore called protein genic amino acids. There are a variety of other amino acids, but do not play a special role in muscle building. The human body takes amino acids in our diet to be in meat, fish, eggs, nuts or dairy products such as skim curd cavort countless amino acids, which then process the body as protein. Some amino acids can enter only in this way in the metabolism, since they cannot be manufactured by the body itself. These essential amino acids have in the branched chain amino acids, the so-called BCAA, again a subgenus. The BCAA include L-valine, L-isoleucine and L-leucine. These are often administered in the sport sector as a dietary supplement because they provide increased muscle power and rapid muscle recovery. In addition to the BCAA are also available in L-arginine, L-Glutamine, L-phenylalanine and L-methionine more amino acids that are often occupied by supplements. Amino acids as a dietary supplement can irritate the body to higher performance during the workout and then favour the duration of the recovery period. Central for building muscle, however, the stimulation of protein metabolism, which increased operating, makes the muscle grow faster. Because of this, amino acids are particularly suitable for strength and power athletes.