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BOULDER, CO - OCTOBER 28:  Presidential candidate Ben Carson looks on during the CNBC Republican Presidential Debate at University of Colorados Coors Events Center October 28, 2015 in Boulder, Colorado.  Fourteen Republican presidential candidates are participating in the third set of Republican presidential debates.  (Photo by Justin Sullivan/Getty Images)
BOULDER, CO - OCTOBER 28:  Presidential candidate Ben Carson looks on during the CNBC Republican Presidential Debate at University of Colorados Coors Events Center October 28, 2015 in Boulder, Colorado.  Fourteen Republican presidential candidates are participating in the third set of Republican presidential debates.  (Photo by Justin Sullivan/Getty Images)

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Carson's ties to health-supplement company

Dr. Ben Carson is denying a relationship with a controversial nutritional-supplement company called Mannatech. CNN's Drew Griffin reports.

Carson's ties to health-supplement company

Dr. Ben Carson is denying a relationship with a controversial nutritional-supplement company called Mannatech. CNN's Drew Griffin reports.