What comes to mind when you think of psychedelic mushrooms? Laser light shows, college experimentation, The Grateful Dead? That’s normally what I think of. So in a way, I owe a debt to the compelling and insightful documentary Dosed, which brings to light a perhaps not-so-widely known use for psilocybin, the active ingredient in magic mushrooms: therapy for depression, anxiety, and a host of other mental afflictions.

Adrianne, the film’s subject, is a ...