Melatonin bụ homonụ nke pineal gland nke ụbụrụ na-ewepụta n'ime anụ mammadụ na ụmụ mmadụ.N'ihi na ọ nwere ike ime ka mkpụrụ ndụ ndị na-emepụta melanin ìhè, ya mere aha ahụ bụ melatonin, nke a makwaara dị ka pineal hormone, melatonin, melatonin.Mgbe emechara melatonin ma chekwaa ya n'ime ahụ pineal, mkpali akwara ọmịiko na-eme ka mkpụrụ ndụ pineal hapụ melatonin.Ihe nzuzo nke melatonin nwere ụda circadian doro anya, nke a na-ebelata n'ehihie ma na-arụ ọrụ n'abalị.Melatonin nwere ike igbochi hypothalamic-pituitary-gonadadal axis, belata ọdịnaya nke gonadotropin na-ewepụta homonụ, gonadotropin, homonụ luteinizing na homonụ na-akpali akpali, ma nwee ike ime ihe ozugbo na gonads iji belata ọdịnaya nke androgen, estrogen na progesterone.