Such grandiose claims, spread by word of mouth and all over the Web, have made XanGo llc, the Lehi, Utah producer of the juice, perhaps the nation's fastest-growing pyramid marketing company.
Holding a maroon folder labeled "Medical Breakthrough, " John Machlovitz, a XanGo distributor, asks attendees to share feedback from "doing" the juice, one of the hottest products in the dietary-supplement market.