Melatonin is a hormone produced by the pineal gland, the organ which regulates the body's sleep/wake cycle. The hormone is secreted in a circadian rhythm by enzymes, which are activated by darkness and depressed by light.*

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Melatonin is a hormone produced by the pineal gland, the organ which regulates the body's sleep/wake cycle. The hormone is secreted in a circadian rhythm by enzymes, which are activated by darkness and depressed by light.*

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