Psilocybin mushrooms (AKA magic mushrooms, or shrooms) is the name given to fungi that contain psilocybin, a naturally occurring psychedelic compound. There are more than 180 species of mushrooms that contain psilocybin, or its derivative psilocin. Psilocybin mushrooms have a long history of use in Mesoamerica in spiritual and religious rituals, and are currently one of the most popular recreational psychedelics in the United States and Europe.
Psilocybin mushrooms have been used in therapeutic settings to treat a wide variety of ailments and disorders including cluster headaches, obsessive-compulsive disorders, anxiety, depression, and addiction.
Magic mushrooms are illegal and categorized as a Schedule I controlled substance in the United States, though recently, the FDA and DEA have allowed some small, highly controlled human studies on their potential for use in medical and psychiatric settings.