them. i do speeches for other people. they were paid speeches. it is absolutely absurd to say that i had an kind of relationship with them. do i take the product? yes. i think it's a good product. >> well, as we reported before, dr. carson is claiming he has no ties to mannatech don't stand up to scrutiny. tonight dr. drew griffin has more information. >> it's a good product. >> reporter: this is the product at the center of the political controversy. ambritose. a dietariry supplement sold by a company called mannatech made up of tree bark, aloe gum and product supposedly to support better health. in 2013 mannatech reported sales of $170 million selling this product based on what it claims is the science of glyco knew nutrients. >> he said there is no science about it. it's a made up term. >> there is no established evidence that these are useful. >> reporter: that has been a problem for mannatech in the past. the texas attorney general sued