Melatonin ndi mahomoni opangidwa ndi pineal gland mu ubongo mwa nyama ndi anthu.Chifukwa amatha kupanga maselo omwe amapanga melanin kuwala, motero amatchedwa melatonin, wotchedwanso pineal hormone, melatonin, melatonin.Melatonin ikapangidwa ndikusungidwa mu thupi la pineal, kusangalatsa kwa minyewa kumapangitsa kuti maselo a pineal atulutse melatonin.Katulutsidwe ka melatonin kamakhala ndi kamvekedwe ka circadian, kamene kamaponderezedwa masana ndikugwira ntchito usiku.Melatonin akhoza ziletsa hypothalamic-pituitary-gonadal olamulira, kuchepetsa zili gonadotropin kumasula timadzi, gonadotropin, luteinizing timadzi ndi follicle stimulating timadzi, ndipo akhoza mwachindunji kuchita pa gonads kuchepetsa zili androgen, estrogen ndi progesterone.