A study reveals that many hair extensions contain chemicals linked to cancer and reproductive risks, cautioning that even biobased products may not be entirely safe.
A new study published in Environment & Health shows that dozens of hair extensions, including synthetic, raw human, and biobased fibers, contain chemicals linked to cancer, birth defects, and reproductive issues. Of 43 products tested, all but two contained hazardous substances, with 12 on California’s Proposition 65 list. Some extensions also exceeded EU chemical limits.
“The hazardous chemicals we identified each carry their own risks,” said lead author Elissia T. Franklin. Repeated use of these products can expose individuals to multiple compounds over time, potentially increasing cumulative health risks, though the study did not confirm whether current exposure levels exceed legal safety standards.
While biobased extensions made from banana or silk fibers are generally safer, some still contained unclassified complex chemicals. Franklin advises caution: “Biobased doesn’t automatically mean safer.” The findings add to growing evidence that hair styling practices, especially in Black communities, may involve exposure to harmful chemicals.
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