It's estimated that half of all Americans take a health supplement every day, from fish oil to multivitamins to diet pills. The booming $30 billion plus vitamins and supplements industry says these products can make consumers healthier, but "Supplements and Safety," a new FRONTLINE investigation with the New York Times and the Canadian Broadcasting Corporation, raises troubling questions. Director/producer Neil Docherty discussed the episode which premieres Tuesday night (1/19) at 9:00 p.m. Central on SDPB-TV. The documentary investigates the hidden dangers of vitamins and supplements - exploring how they're marketed and regulated.