Ashwagandha, a mainstay of traditional Ayurvedic Indian medicine has been prescribed for a few thousand years to treat physical and mental fatigue. And over the past decade or two, Western researchers have been measuring its benefits across multiple health domains: stress-reduction; mood; sleep; brain; hormones; even physical strength. Pretty impressive for a shrub (technical name: Withania somnifera) grown all over Asia, the Middle East and Africa, whose Sanskrit name, Ashwagandha, translates roughly to “smell of the horse.”