Lately supplementation market, thanks to wide researches, has been diversified with d-aspartic acid. As it was found out this amino acid derivative shows strong characteristics, similar to those of testosterone. It highly affects sexual functions, increases libido, prolongs and affects the quality of sexual intercourse. D-aspartic acid, via a complex series of biochemical reactions, increases the concentration of LH and testosterone, and thus indirectly this compound is causing all positive reactions associated with these hormones. In addition, it affects on secretion of dopamine and GABA (having here a substance relaxing, unwinding and calming properties).