FRONTLINE teams with The New York Times and the Canadian Broadcasting Corporation to examine the vitamin and supplement industry, a business worth billions that operates with almost no oversight from the FDA. Reporters trace cases where store-bought pills caused liver damage, heart failure, and death, interviewing families of victims alongside doctors who treated them. The film follows how the 1994 law reshaped supplement regulation in the United States, letting manufacturers sell products without proving they are safe or effective before they reach shelves. Undercover testing and internal industry documents show how some companies market ingredients linked to serious health risks while regulators struggle to act even after harm is reported. Executives and lobbyists defend the industry's practices on camera, while former FDA officials describe the agency's limited power to pull dangerous products before more people are hurt. The reporting moves between the Capitol Hill lobbying that kept the law in place and the emergency rooms where its consequences show up.