10 ] Melatonin has been reported in foodstuffs including cherries to about 0.17-13.46 ng/g, [ 11 ] bananas and grapes, rice and cereals, herbs, olive oil, wine [ 12 ] and beer. When bird chicks ingest melatonin-rich plant feed, such as rice, the melatonin binds to melatonin receptors in their brains. [