Melatonin at a glance
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Melatonin is produced in the dark, while we sleep and wanes upon daybreak:
bright light signals the production cycle to shut down. It is secreted by the pineal gland, a small organ set behind and between the eyes. The pineal is called the “third eye”, a reference to our evolutionary heritage – a time when the pineal may have extended the sensory capacities. The pineal gland serves as the timekeeper of the brain, helping to govern the sleep walk cycle and, in animals, seasonal rhythms of migration, mating and hibernation. In the human population, melatonin levels are highest in children.
Melatonin is made from an amino acid called tryptophan. Tryptophan is an essential amino acid – we can only get it from the food that we ingest. The tryptophan we consume during the day is converted into serotonin, a brain chemical involved with mood. Serotonin, in turn, in converted into melatonin.
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