sentences:  Carson's image still appeared on the Mannatech's website in 2014, and in the same year he praised their "glyconutrient" supplements in a PBS special ("The Missing Link – The Science of Brain Health"), sponsored by a group of Mannatech distributors, that was subsequently featured on the site.During the CNBC GOP debate on October 28, 2015, Carson was asked about his relationship with Mannatech and denied any involvement with the company.Politifact rated Carson's denial of any involvement as "false".