Abstract
Three centuries ago, the French philosopher Rene Descartes described the pineal gland as “the seat of the soul,” but it was not until the late 1950s that melatonin, the principal substance secreted by the pineal gland, was identified.1 There is now evidence that melatonin may have a role in the biologic regulation of circadian rhythms, sleep, mood, and perhaps reproduction, tumor growth, and aging (Table 1). However, uncertainties and doubts still surround the role of melatonin in human physiology and pathophysiology. This review summarizes current knowledge about melatonin in humans and its clinical implications. Physiology and Pharmacology In humans, the . . .
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