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 saying "the vividness of this place only underscores the lifelessness of the people leading us through it ... There are 394 million stories on the City of a Thousand Planets, and Valerian’s might be the only one we’ve seen before. Still, any excuse to visit this place is one worth taking." Peter Sciretta of /Film touted the first half of "Valerian" as "unpredictable and bonkers insane", while calling the second half more formulaic and "far less exciting", though he still encouraged seeing the film in 3D "on the biggest screen possible". Ignatiy Vishnevetsky of "The A.V. Club" wrote that it