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 often seems more 19th- than 26th-century, notably in a sequence where Laureline is captured by members of a hostile species and forced to don a white dress to be presented to their emperor. The blobby computer-generated creatures resemble natives from the most racist of "Tarzan" movies." Despite the film being a disappointment at the box office, director Luc Besson claims a sequel is still possible due to positive fan reaction. 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