Ayahuasca is a medicinal tea with a history of use dating back over 2,500 years. The two main ingredients are Ayahuasca vine (Banisteriopsis caapi) and Chacruna (Psychotria viridis). Huachuma (San Pedro) cactus has perhaps the longest history of use of any plant medicines in South America. Its ceremonial use dates back almost 3,500 years and its traditions continue today.