Melatonin is a neurohormone produced in humans by the pineal gland. A favorite of travelers, it governs the body's circadian rhythms, helping the body ease into restful sleep. Melatonin is also a potent antioxidant.Source Naturals Timed Release Melatonin is formulated to allow for a gradual release of the active ingredient during an approximate six hour period. This provides the body with a more even absorption of melatonin.The Benefit of Sublinguals Some nutrients may break down during liver metabolism. The sublingual form is absorbed directly into the bloodstream, via the blood vessels under the tongue and in the cheeks, bypassing the liver and allowing for quick entry into the system.