Study Finds Hormone-Disrupting Chemicals in Major Headphone Brands

A comprehensive study has revealed that a wide array of headphones from both premium and budget brands contain harmful, hormone-disrupting chemicals. The investigation, titled The Sound of Contamination: A Comprehensive Analysis of Endocrine Disruptors and Hazardous Additives in the Headphones, was conducted by the non-profit organization Arnika as part of the EU-funded ToxFree LIFE for All project.

The research analyzed 81 different headphone models sold across five European countries: Austria, Czechia, Hungary, Slovakia, and Slovenia. Researchers tested 180 plastic components and found that 100% of the products contained hazardous chemicals. The findings implicate major industry names including Apple, Bose, JBL, Samsung, and Sennheiser, as well as products from online marketplaces like Temu and Shein.

Chemical Findings and Health Risks

The study identified the presence of bisphenols, phthalates, and flame retardants in every single model tested. Specifically, Bisphenol A (BPA) was detected in 98% of the samples, while Bisphenol S (BPS) appeared in more than 75% of the products. Some concentrations reached as high as 351 mg/kg, which significantly exceeds the 10 mg/kg limit proposed by the European Chemicals Agency (ECHA).

These substances are classified as endocrine disruptors, which can mimic the body’s natural hormones. According to the reports, these chemicals are linked to serious health issues, including cancer, infertility, neurodevelopmental problems, and the feminization of males.

Chemical expert Karolína Brabcová of Arnika noted that these substances may migrate from the headphones into the human body. This process is reportedly accelerated during daily use, particularly during exercise when heat and sweat are present, allowing chemicals to migrate directly to the skin.

Industry-Wide Impact and Retail Response

The report suggests a market-wide failure and an industry-wide reliance on these materials. While 68% of contact parts were rated as low risk (green) in one evaluation, 44% of the overall models were categorized as unsatisfactory. Gaming headsets were highlighted as posing a higher health risk due to the prolonged skin contact associated with their use.

In response to these findings, some European retailers have begun pulling select headphone models from their shelves. The study also highlighted the issue of regrettable substitutions, where manufacturers replace banned chemicals with nearly identical alternatives that carry similar neurotoxic and endocrine-disrupting risks.

The risk levels varied across different brand tiers, with the following findings regarding high-concern (red) ratings:

• Products from well-known brands: 48% red
• Products from retail brands: 50% red
• Products from no-name brands: 27% red

Broader Context of Headphone Usage

These safety concerns emerge as the use of headphones continues to be a point of contention in public spaces. In March 2026, United Airlines announced that passengers who play audio or videos without headphones risk a permanent ban from their aircraft. The airline stated that this policy change coincided with the expansion of Starlink to make their Wi-Fi rules clearer in the contract of carriage, though they provide free headphones to passengers who forget theirs.

Public pressure to enforce headphone use has also reached political levels. In 2025, the Liberal Democrats called for headphone dodgers who blast loud music on trains and buses to face fines of up to £1,000.

Despite the alarming chemical concentrations found in the study, researchers have stated that there is no immediate danger to users.