"These products, often presented as devices similar to oximeters, are often advertised under different brand names, promising fast, reliable, and painless results and even referring to supposed 'approvals' granted by the competent authorities".

According to the document, Infarmed was alerted, through cooperation mechanisms with similar authorities, to the fact that it had identified, on various online platforms and social media, an increased availability of devices allegedly designed to measure blood glucose levels non-invasively, that is, without the need to pierce the skin.

The national authority also stated that there is no record of CE-marked medical devices that allow non-invasive blood glucose measurements to be made available on the Portuguese market.

"Products claiming this purpose are likely based on misleading claims," ​​the circular warned, noting that "any reference to approval or certification by a competent authority" of one of the European Union member states is false.

In light of this, Infarmed recommends that “medical devices should be purchased from duly legalised economic operators,” and that purchases from unverified websites or online platforms should be avoided, as this poses risks to consumers due to there being no guarantee of quality, safety, and performance.