Melatonin is a hormone whose activity focuses at a central level, regulating the circadian rhythm during sleep and wakefulness. Besides being produced in the pituitary gland, melatonin release might get affected by the exposure to light received through the retina. Many people use electronic devices when they're in bed and they usually suffer alterations producing insomnia. As we get older, melatonin levels decrease - therefore melatonin supplementation can improve sleep quality, rest, and help adjust our biological clock (which reduces jet-lag effects) or even act on leptin, the hormone responsible for regulating our organism.

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