Is Your Smartwatch Band Exposing You to Harmful Chemicals? What to Know Before Wearing It Again
While your fitness tracker helps you monitor steps and heart rate, new research suggests it could also expose you to harmful chemicals. Scientists have found that several popular smartwatch bands contain significant levels of PFHxA (perfluorohexanoic acid), a concerning chemical that can be absorbed through the skin.
In a detailed study of 22 watch bands from different brands and price ranges, researchers discovered that many bands marketed as containing “fluoroelastomers” – a synthetic rubber designed to resist sweat and oils – contained significant levels of PFHxA. This chemical could easily transfer to the wearer’s skin, raising concerns, especially since approximately 21% of Americans wear smartwatches or fitness trackers for more than 11 hours a day.
Smartwatch bands expose users to harmful PFAS chemicals
Graham Peaslee, the study’s lead author, emphasized the importance of the findings, stating, “This discovery is significant due to the extremely high levels of one type of forever chemical found in products that remain in close contact with our skin.” This is especially concerning as millions of people wear these devices for long periods. A 2020 study referenced by the researchers found that participants wore their devices for an average of 11.2 hours a day. The bands tested were from different manufacturers and price points, though specific brands were not revealed.
PFHxA is part of the larger family of synthetic chemicals known as PFAS (per- and polyfluoroalkyl substances), often called “forever chemicals” due to their ability to remain in the environment and human body for long periods. While PFAS are found in items like non-stick cookware, food packaging, and cosmetics, their presence in watch bands worn directly on the skin creates a distinct exposure risk.
Health risk associated with smartwatches
The study found that watch bands priced above $30 contained high levels of fluorine, with concentrations of PFHxA exceeding 1,000 parts per billion (ppb), much higher than in most consumer products. In contrast, cheaper bands under $15 were free of these chemicals. Some bands even exceeded 16,000 ppb, far surpassing the 200 ppb found in cosmetics.
This study is timely as regulatory bodies in the U.S. and Europe are tackling PFHxA concerns. In 2023, the U.S. EPA highlighted potential health risks from PFHxA, including effects on the liver, blood, and endocrine system, while the EU has begun restricting its use.