I-Melatonin iyi-hormone ekhiqizwa indlala ye-mammalian kanye ne-pineal yomuntu, enemisebenzi ehlukahlukene yezinto eziphilayo, okuhlanganisa ukuthuthukisa izinga lokulala, ukulwa nokuguga, nokuvikela imithambo yegazi. ukuthuthukisa izinga lokulala, ukunciphisa inani lokuvuka ebusuku, nokwelula isikhathi sokulala okujulile.Ngaphezu kwalokho, i-melatonin iphinde ibe yi-antioxidant enamandla kakhulu, engasusa ama-radicals mahhala emzimbeni, ibambezele ukuguga, futhi ibe nomthelela wobuhle nobuhle.I-Melatonin futhi inomphumela wokuvikela emithanjeni yegazi.