In Mushroom Medicine: The Healing Power of Psilocybin & Sacred Entheogen History, author Brian Jackson describes his personal experiences with psilocybin mushrooms, both recreationally, and as a medicine. The book also discusses the latest research being done on psilocybin at many top universities, which have shown promising results in the treatment of OCD, depression, & anxiety. These studies have also shown a correlation between taking psilocybin and having mystical experiences. Due to these findings, the book also explores how psychedelic plants were used throughout history by numerous religious groups.