>> announcer: the following is a paid advertisement for green tea cr, brought to you by purity products. >> one of my favorite guests is on the program with us tay. we're gonna get to him in just a moment. i'm talking about chris kilham, known as the medicine hunter. cnn calls chris the indiana jones of natural medicine because he's constantly scouring the globe, searching for natural remedies. you may have seen chris on "the dr. oz show" or maybe on pbs or cbs. he's been on fox news, where he does a health segment. he's been featured in the new york times, also on abc's "20/20." he's an author, he's an educator, he's written 14 books. he's joining us today to talk about not one but three of the hottest nutritional ingredients