Hazardous Chemicals Found in Popular Hair Extensions

Study reveals concerning levels of cancer-linked substances in unregulated beauty products.

Published on Feb. 16, 2026

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A new study by the Silent Spring Institute has found that dozens of hazardous chemicals, including those linked to cancer and chronic illness, are present in many popular hair extension products. The researchers analyzed 43 hair extension items and detected 169 different chemicals, many of which appear on California's Proposition 65 list of substances known to cause cancer or reproductive harm. The findings are especially concerning given that over 70% of Black women report wearing hair extensions, exposing them disproportionately to these health risks in an industry that largely lacks transparency and regulation.

Why it matters

Hair extensions have become increasingly common, especially among Black women, but the lack of ingredient labeling and regulation in this industry means consumers are unaware of the potential health hazards they may be exposing themselves to. This study sheds light on the need for greater transparency and safety standards to protect vulnerable communities.

The details

The Silent Spring Institute used advanced chemical testing to analyze 43 hair extension products purchased online and from local beauty stores. They detected 169 different chemicals, many of which are linked to cancer, hormone disruption, developmental problems, and immune system effects. Nearly all of the products tested contained hazardous substances such as flame retardants, phthalates, pesticides, and organotins. Some of the chemicals identified appear on California's Proposition 65 list of substances known to cause cancer or reproductive harm.

  • The study was published on February 16, 2026.

The players

Silent Spring Institute

A non-profit research organization focused on environmental health and justice.

Dr. Elissia Franklin

A research scientist at the Silent Spring Institute and lead author of the study.

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What they’re saying

“There are not any ingredients labels on the product, so it leaves the consumer in the dark, and people cannot make informed decisions.”

— Dr. Elissia Franklin, Research Scientist, Silent Spring Institute

“I think it starts with companies being more transparent about what they're putting in the product and allowing the consumer to make a decision. Granted, these decisions should not be on the consumer. There should be a requirement that companies are not putting these chemicals in the products that we use every day.”

— Dr. Elissia Franklin, Research Scientist, Silent Spring Institute

What’s next

Several states and the U.S. Food and Drug Administration are considering measures that would regulate the safety of hair extensions.

The takeaway

This study highlights the urgent need for greater transparency and regulation in the hair extension industry to protect the health of vulnerable communities, particularly Black women, who are disproportionately affected by the use of these products containing hazardous chemicals.