How are dietary supplements regulated?

Companies that make supplements are responsible for the safety of their products. They must ensure that their products are free of contaminants and that they're accurately labeled.

Dietary supplements don't require approval by the U.S. Food and Drug Administration (FDA). But if a supplement is found to be unsafe, the FDA can issue warnings or ask that it be withdrawn from the market.

The FDA can also take action against companies that make false or unsupported claims to sell their supplements.