Research Discovers Cancer-Linked Substances in Hair Extensions

A recent investigation has uncovered that commonly used hair extensions contain a variety of hazardous chemicals, many of which are linked to cancer, hormone disruption, and reproductive damage.

The research, conducted by experts at the Silent Spring Institute, identified 169 distinct chemicals across 43 different hair extension products.

Published in February 2026 in the journal Environment & Health, the study raises alarms regarding the safety of products typically utilized for braiding.

The research indicated that both synthetic and natural hair extensions, which include those advertised as human hair or plant-based, are contaminated with chemicals, suggesting this problem is prevalent throughout the industry.

Chemical Risks

Researchers noted the detection of numerous dangerous substances, with certain synthetic fibers exhibiting particularly elevated levels of chemical signatures. Among the chemicals found were phthalates, organotin compounds, flame retardants, and other industrial materials.

Approximately 10 percent of the samples contained organotins, with certain levels surpassing European Union safety guidelines for consumer products. The study also highlighted that phthalates were present in about half of the samples, even in those labeled as "phthalate-free," raising concerns about product labeling accuracy.

The study detected 17 chemicals commonly associated with breast cancer in most of the tested items, with about 91 percent harboring at least one substance known to cause cancer or reproductive harm under California’s Proposition 65.

Elissia Franklin, the lead author of the study, expressed surprise at finding organotins, noting that these substances are frequently utilized as heat stabilizers in PVC and are known to provoke skin irritation.

Exposure Concerns

The research team pointed out that the manner in which hair extensions are employed may heighten exposure to these chemicals. Extensions are often worn for prolonged periods and remain in close contact with the scalp, while the heat applied during styling might release volatile organic compounds (VOCs).

This leads to potential exposure for both users and hairdressers through skin contact and inhalation. A report by CNN, referencing a Consumer Reports investigation, also discovered lead in most of the tested braiding hair products, with each sample containing VOCs that present health hazards.

Experts suggest that hair braiders might experience the highest level of exposure due to the repetitive and extended contact with these products. Franklin emphasized that hair braiders represent a particularly vulnerable group.

“We should not place the responsibility on hair braiders to make individual choices about product safety,” she stated, calling for the establishment of safety regulations.

Regulation and Transparency Gaps

The findings of the study illuminate serious issues regarding the lack of regulation within the hair extension market, where manufacturers are not compelled to disclose all ingredients. Researchers indicated that this omission restricts consumers' ability to evaluate potential risks, complicating appropriate safety assessments.

Franklin remarked, “Companies infrequently reveal the chemicals used to achieve product attributes, leaving consumers unaware of the health risks associated with extended use.”

Moreover, these findings raise concerns concerning health disparities, particularly since hair extensions are predominantly worn by Black women.

Studies indicate that over 70 percent of Black women utilize hair extensions at least annually, often for extended periods. Franklin argued that "This industry has historically neglected the health of Black women, who should not have to choose between cultural expression, convenience, and their well- being."

The researchers advocated for stricter regulations, improved product labeling, and additional research to thoroughly understand the long-term health implications.