Smartwatches that claim to measure blood sugar without needles are once again under scrutiny, this time from Germany’s Federal Network Agency. In its latest market surveillance report, the regulator confirmed that several devices sold in 2025 advertised blood glucose tracking despite having no technical ability to measure it, which is a practice officials say poses real risks to consumers.

According to the agency, inspections carried out over the year uncovered problems across roughly 7.7 million electronic products. Many of the violations were procedural, such as missing CE markings or incomplete German-language documentation. Others, however, went far beyond paperwork. Among the most concerning findings were smartwatches that simulate blood sugar readings using unrelated sensors or estimated values, while presenting the results as genuine health data.

Why blood sugar tracking on smartwatches is misleading

Industry experts have been clear for years: accurate blood glucose monitoring requires either invasive testing or an external continuous glucose monitor (CGM). No standalone smartwatch can currently deliver reliable readings on its own. Despite this, low-cost models sold mainly through online marketplaces continue to market the feature aggressively, often targeting people with diabetes.

In at least some cases, the consequences could be serious. A previously published review of the Kospet iHeal 6 showed that its so-called glucose readings varied sharply from real measurements, sometimes enough to influence medication decisions. Regulators warn that relying on such data could lead users to delay insulin, overcorrect their dosage, or ignore warning signs altogether.

The scope of the issue remains significant. The agency flagged 1,266 online listings suspected of non-compliance. While this figure represents an 11.2% decline compared to the previous year, the products involved still accounted for an estimated five million units sold. Smartwatches were the most common offenders, not only for false health claims but also for violations of Germany’s Radio Equipment Act.

Offline inspections revealed similar problems. Of 2,400 device models checked at retail, 58% failed to meet regulatory standards, affecting around 1.9 million units. Most issues were administrative, though some products were found to emit excessive electromagnetic interference.

Customs authorities also stepped up enforcement, blocking 359,000 non-compliant devices at the border after examining more than 8,200 shipments.

For regulators, the message is straightforward: health claims must be backed by real technology. For consumers, Germany’s warning is a reminder that if a smartwatch promises needle-free blood sugar tracking, skepticism is not just reasonable, it’s necessary.

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