Ayahuasca is a psychoactive brew that has a long history of ritual use among indigenous groups of the Upper Amazon. In recent years, it has gained in popularity worldwide, with some practitioners suggesting that the drug inspires greater self-knowledge, healing, and reconnection with the natural world. This formerly esoteric, little-known drink is now a growth industry. But why? While recounting the history of ayahuasca, this book explores its scientific basis and its potential impact on society.