If there is indeed a Fountain of Youth, it's probably located right between your ears: a tiny conical gland at the centre of your brain known as the pineal gland. As fountains go, the pineal gland isn't very productive: It releases almost undetectable minute quantities of a substance known as melatonin into the bloodstream. But as researchers have learned more about this mysterious and elusive hormone, they have discovered that it has far-reaching effects on some of our most basic bodily processes. In fact, drop for drop, melatonin may be one of the most powerful hormones in the body.
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