San Pedro The channeling of healing energy from its spiritual source to someone who needs it is called spiritual healing. CUSCO WAHCA 957707108  In this article we review the ethno-archaeological and ethno-historical evidence of the ritual use of the San Pedro cactus in the pre-Columbian cultures, and these findings are compared with the information provided by current ethnographical studies. The longer a cactus has been stored, the stronger and the higher its content in mescaline- derived alkaloids will be. Archaeological evidence has been found of the use of San Pedro for magical-religious purposes in the following pre-Columbian Cultures: Cupisnique (1500 BC), Chavin (1000 BC), Moche (100-750 AD) and Lambayeque (750-1350 AD). Today's master shamans use San Pedro on altars ('mesas') erected for healing rites in order to treat enchantment and bad luck.The mesa follows a sophisticated ritual: 'levantar' (raise) or sniff tobacco with alcohol, ingest San Pedro, pinpoint the diseases, cleanse the evil and 'florecer' (flourish) the sick person. The mesa rite is performed in the early hours of Tuesdays and Fridays, which are sacred days in the Andean religions.