Melatonin is a hormone secreted by the pineal gland which is responsible for the lightning of the skin. Melatonin is the hormone responsible for sleeping and waking cycles. People who are suffering from chronic insomnia usually use melatonin supplements, however it is not recommended for all patients with sleep problems. In vertebrates this hormone is derived from serotonin, this is responsible for darkness of the skin. Melatonin journals deals with penial gland secreations. Related journals of Melatonin Melatonin and Ageing, Melatonin, Melatonin against Parasitic Infections, Melatonin in Multiple Sclerosis, Nutrition, Toxicology of Melatonin, Disorders. Melatonin plays a important role in regulation of sleep cycles. Melatonin receptors are found in the SCN (suprachiasmatic nucleus) and the pituitary gland of the brain, as well as in the ovaries, blood vessels, and intestinal tract. Melatonin also has anti-aging properties it acts as antioxidant, neutralizing harmful oxidative radicals and activation of antioxidant enzymes. it also modulate immune system to some extent.