Renowned ethnopharmacologist, Dr. Dennis McKenna, discusses the origins and the pharmacology behind the powerful South American hallucinogenic brew called ayahuasca.
He says that the pharmacology of the brew, and how it works, are well understood, but that Western scientists are baffled by the question of how the indigenous shamans, or curanderos, discovered the precise method for creating the decoction–where are the roots in history of ayahuasca origins?