This review examines two books about plants that have been used in religious and healing rituals across many cultures for their mind-altering properties. The author verifies that the hallucinogenic plants described in Carlos Castaneda’s popular books about a Yaqui sorcerer are accurately portrayed pharmacologically. The review explains how different sacred plants like peyote, certain mushrooms, and nightshade varieties affect the brain through various chemical pathways, while noting their dangers when misused.