Melatonin
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Melatonin is a hormone found in animals, plants, and microbes. In animals, levels of melatonin have a daily cycle. It drives the circadian rhythms of several biological functions.
Melatonin is produced in the pineal gland. The pineal gland is on the blood side of the blood-brain barrier. It secretes melatonin "directly into the systemic circulation", thus melatonin is not affected by the blood-brain barrier
See also
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