41 popular hair extensions have toxic chemicals linked to cancer and other health risks

The global market for hair extensions is booming, and projected to hit $14 billion by 2028. What was once a niche luxury item for women is now widely available.

Now, a new study from Silent Spring Institute says many hair extensions—including products made from human hair—contain dozens of hazardous chemicals, some linked to cancer.

The research, published in the American Chemical Society journal Environment & Health, provides the strongest evidence to-date about the potential...