For Occasional Sleeplessness. Melatonin is a neurohormone produced in humans by the pineal gland. A favorite for travelers it governs the body's circadian rhythms helping the body ease into restful sleep. Melatonin is a potent antioxidant. . Suitable for vegetarians. Contains no yeast dairy egg gluten or wheat. Contains no sugar starch salt preservatives or artificial color flavor or fragrance.