Valerian, used since ancient Greek times, is believed to be one of the most valued herbs throughout the world. Nature's Plus Herbal Actives Valerian root extract is uniformly standardized to a minimum of 1% (6 mg) valerenic acid to guarantee that each and every capsule delivers consistent potency and activity. Each capsule, delivering the greatest concentration of active botanical principles, maximizes the synergistic benefits of the whole root, which naturally features sesquiterpenes and glycosides.