Why is there a supplement craze if they don’t even work?

Sarah Gonzalez and Jane Black investigate the $70 billion dietary supplement industry, which is projected to double in seven years despite weak evidence that most products work. They trace a century-long tug-of-war between regulators and consumers who are drawn to the promise of a quick fix, and explain how lobbying, lax regulation, and the GRAS loophole have allowed the industry to thrive.