I got smarter (sort of), but it certainly wasn’t a cure-all. “Brain,” the dark glass jar read, alongside a shortlist of benefits including “mood-lifting,” “mental clarity,” and “anxiety-reducing.” The container was filled with a powdery blend of adaptogens that promised to make me a happier, calmer, and smarter version of myself if I just mixed a bit of this magic powder into my water, juice, or coffee every day.