Valerian (herb) particular binding site. Hydrophilic extractions of the herb commonly sold over the counter, however, probably do not contain significant amounts of isovaltrate. Valerenic acid in valerian stimulates serotonin receptors as a partial agonist, including 5-HT which is implicated in the sleep-wake cycle. The chief constituent of valerian is a yellowish-green to brownish-yellow oil present in the dried root, varying in content from 0.5 to 2.0%. This variation in quantity may be determined by location; a dry, stony soil yields a root richer in oil than moist, fertile soil. The volatile oils that form the active ingredient are pungent, somewhat reminiscent
Valerian and the City of a Thousand Planets Valerian and the City of a Thousand Planets Valerian and the City of a Thousand Planets () is a 2017 English-language French 3D space opera film written and directed by Luc Besson, and co-produced by Besson and his wife, Virginie Besson-Silla. The film is based on the French science fiction comics series "Valérian and Laureline", written by Pierre Christin and illustrated by Jean-Claude Mézières. It stars Dane DeHaan as Valerian and Cara Delevingne as Laureline, with Clive Owen, Rihanna, Ethan Hawke, Herbie Hancock, Kris Wu and Rutger Hauer in supporting roles. Besson independently crowd-sourced and personally funded "Valerian". With a