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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 the company back in 2007 charging man natech with a screm that exaggerated their products health benefits. in fact, state officials charged mannate mannatech's materials falsely claimed the dietary supplements could treat down syndrome, cancer and other serious illnesses. >> the te...

Founder paid $7 million to settle the suit without admitting wrongdoing and stopped making claims it could cure anything. >> i'm a candidate for president. >> reporter: so what does all this have to do with dr. and presidential candidate ben carson? this. >> let me just briefly delve into how i became associated with the products of this company. >> reporter: ben carson has a relationship with mannatech spanning nearly a deck said since he began taking it beginning in 2004 to 2013, dr. carson made four speeches in front of mannatech sales associates and the most recent speech carson was paid $...

This have to do with dr. and presidential candidate ben carson? this. >> let me just briefly delve into how i became associated with the products of this company. >> reporter: ben carson has a relationship with mannatech spanning nearly a deck said since he began taking it beginning in 2004 to 2013, dr. carson made four speeches in front of mannatech sales associates and the most recent speech carson was paid $42,000. for the three previous speeches, the company made donations to the carson scholarship fund but wouldn't say how much. in his speeches and testimonial interviews used in promotion...

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 hea...

Legitimate way. >> reporter: it's obvious why mannatech wanted a highly respected neurosurgeon to speak highly of the product. what is not obvious, why a neurosurgeon would lead his name to an unproven product. we asked about that at johns hopkins where ben carson became a famous neurosurgeon. >> we here at a major medical and bio medical research institution have a special responsibility to abide by evidence and share evidence based, knowledge with people. and whenever anybody here falls short of that standard, to me, that's disappointing. >> reporter: dr. carson was asked about his relations...