ron wheelock, aka, the gringo shaman.a former mechanic and pot dealer from kansas, who spent two decades in peru, cooking up psychedelic teas in his role as shaman, or traditional healer. i meet up with stan and ron at el purguero as the gringo shaman breaks down the mix for his brew, acclaimed as the most powerful in the region. >> these are the leaves of the wambita, the chaliponga, they contain five dmt. this is chacruna, this contains indian dmt. and these are from the -- [ indiscernible ] >> for millennia, native shamans in the amazon has tapped this jungle pharmacy for all types of cures. but in the past decade, thousands of american tourists have flocked here, seeking help from medicine men, healers like ron. a ten-day retreat at el purguero costs about a thousand dollars and attracts a wide range of seekers from across the globe. a father and daughter from canada, an online entrepreneur, the son of a successful ceo, and a professor from belgium. like stan, these travelers are serious. they want healing for mind, b