Watch Bands Identified As Troubling Source Of “Forever Chemicals”

Smartwatches have become essential to daily life, helping people monitor health and fitness while staying connected. However, a recent study has raised concerns about the safety of materials used in smartwatch bands. Researchers have found several popular bands contain high levels of per- and poly-fluoroalkyl substances (PFAS), a group of chemicals linked to potential health risks.

PFAS, commonly referred to as “forever chemicals,” are known for their resilience and ability to repel oil and water. First introduced in the 1940s, these chemicals have been widely used in industries like aerospace, food packaging, and consumer products such as non-stick cookware, waterproof fabrics, and personal care items. While their durability makes them valuable for manufacturing, it also means they persist in the environment and accumulate in living organisms, potentially leading to health issues like cancer and diabetes.

The research, conducted by a team from the University of Notre Dame, tested 22 smartwatch bands from major brands like Apple, Google, Fitbit, and Samsung. The focus was on detecting 20 types of PFAS, and the findings revealed alarming results. Nine bands contained perfluorohexanoic acid (PFHxA), a specific type of PFAS, with median concentrations reaching nearly 800 parts per billion (ppb). One band even exceeded 16,000 ppb, a stark contrast to the 200 ppb typically found in cosmetics.

Study co-author Graham Peaslee highlighted the significance of this discovery: “This stands out because of the very high concentrations of one type of forever chemical found in items that are in prolonged contact with our skin.”

Thirteen of the bands were advertised as being made with fluoroelastomers, a synthetic rubber known for its durability. All these bands were found to contain fluorine, a key component of PFAS. Interestingly, even two bands not labeled as fluoroelastomer-based were also found to contain fluorine. Bands costing over $30 were more likely to have higher PFAS levels compared to those under $15, indicating that premium bands may pose greater exposure risks.

Although PFAS has been detected in the human body for years, the study emphasizes that the extent of PFHxA’s absorption through the skin and its long-term effects remain unclear. Scientists are still investigating whether and how these chemicals might impact human health when absorbed via prolonged skin contact.

Lead author Alyssa Wicks advises consumers to carefully review product descriptions when shopping for smartwatch bands.

“If the consumer wishes to purchase a higher-priced band, we suggest that they read the product descriptions and avoid any that are listed as containing fluoroelastomers,” Wicks stated.

On a broader scale, regulatory bodies like the European Commission are taking steps to limit PFAS exposure. Starting in October 2026, new restrictions will cap PFHxA levels in cosmetics at no more than 25 ppb, reflecting growing concerns over the widespread use of these chemicals.