I-Melatonin iyi-hormone ekhishwa yi-pineal gland yobuchopho ezilwaneni ezincelisayo nakubantu.Ngoba ingenza amangqamuzana akhiqiza i-melanin ukukhanya, yingakho igama elithi melatonin, eyaziwa nangokuthi i-pineal hormone, i-melatonin, i-melatonin.Ngemuva kokuthi i-melatonin ihlanganiswe futhi igcinwe emzimbeni we-pineal, ukuvuthwa kwezinzwa zozwela kwenza amangqamuzana e-pineal akhulule i-melatonin.Ukukhiqizwa kwe-melatonin kunesigqi esisobala se-circadian, esicindezelwa emini futhi sisebenze ebusuku.I-Melatonin ingavimbela i-axis ye-hypothalamic-pituitary-gonadal, yehlise okuqukethwe kwe-gonadotropin ekhulula ihomoni, i-gonadotropin, i-hormone ye-luteinizing kanye ne-follicle stimulating hormone, futhi ingasebenza ngokuqondile kuma-gonads ukunciphisa okuqukethwe kwe-androgen, i-estrogen ne-progesterone.