NutriBiotic MetaRest® combines melatonin and kava root, two of the most potent ingredients found in nature to help relieve occasional sleeplessness. MetaRest contains melatonin, an essential neurohormone produced by the pineal gland, which helps set and maintain the internal clock governing the natural rhythms of the body. Kava root is a traditional drink of the South Pacific Islands used for its profound relaxing qualities.