Learn about psilocybin, a chemical in certain types of mushrooms that can cause hallucinogenic effects and may have medical uses. Find out how psilocybin works in the brain, what are the risks and benefits, and how NIDA supports research on this topic. Magic mushrooms are any species of mushroom that contain the psychoactive compound psilocybin and psilocin. Research studies have shown shrooms offer a variety of mental health benefits. Justice PV Kunhikrishnan, who presided over the case, argued that mushrooms, including magic mushrooms, cannot be considered narcotics or psychotropic substances. Psilocybin is a hallucinogenic chemical in certain mushrooms known as magic mushrooms. Eating mushrooms that contain psilocybin can have a variety of effects, ranging from euphoria to...