Smartwatches fake blood sugar readings as Germany’s regulator steps in
There is currently no smartwatch that can reliably determine blood glucose levels without connecting to an external sensor such as a continuous glucose monitor (CGM). Even so, many cheap smartwatches are advertised with a blood sugar measurement feature.
As Germany’s Federal Network Agency reports, some of these smartwatches had also been sold in Germany before the authority pulled them from the market. How far the "measurements" from such a smartwatch can deviate from actual blood glucose levels is illustrated by our Kospet iHeal 6 review.
In 2025, the Federal Network Agency found a total of 1,266 suspicious online listings, which constitutes a drop of 11.2% compared to the previous year. Those listings supposedly account for around five million units sold. Smartwatches were responsible for the most violations in this category, not only because of simulated sensor readings, but also because requirements of the so-called Radio Equipment Act haven’t been met.
In retail inspections last year, Germany’s Federal Network Agency reviewed 2,400 device types. Of those, 58% failed to meet requirements, which means a total of 1.9 million sold devices are affected. In many cases, the issues didn’t result in major safety risks, such as missing CE marking or user manuals that were not offered in German.
However, the agency also found products including PV inverters and network switches with excessively high interference voltage, which in some cases could disrupt wireless devices, broadcasting and military signals. According to the agency, customs prevented the import of a total of 359,000 products. 8,202 shipments have been flagged as suspicious by customs, 89% of those were not compliant with regulations.
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