A new study published in Environmental Science & Technology Letters has found that some smartwatch and fitness tracker bands may be exposing users to harmful chemicals.
Researchers discovered that wristbands made from fluoroelastomers—a type of synthetic rubber—contain high levels of perfluorohexanoic acid, a member of the PFAS chemical family, often referred to as “forever chemicals.”
PFAS are known for their resistance to heat and water but are also linked to serious health issues such as cancer, infertility, and high blood pressure due to their persistence in the body and environment.
Out of 22 wristbands tested, perfluorohexanoic acid was the most commonly detected chemical, with fluoroelastomer-based bands posing the highest risk.
Experts warn that people who wear these bands during exercise may face increased exposure, as sweat, body heat, and elevated blood flow can enhance the skin’s absorption of toxic substances.
To reduce potential health risks, researchers recommend switching to wristbands made from safer materials such as silicone, fabric, or leather.
