Botanical Support for Restful Sleep Herbal Supplement Approved by Michael Tierra L.Ac, O.M.D Valerian root has been the primary herb of choice for supporting a restful sleep since the 9th century. Modern research has confirmed this traditional use, identifying valerenic acid, a component of the essential oil, as being primarily responsible for its relaxing effects. Planetary Herbals Full Spectrum Valerian Extract delivers 450 mg of a concentrated standardized extract yielding 0.8% valerenic acid, and an additional 200 mg of whole valerian root.