[distantaidenn]

Freestyle Libre : https://www.freestyle.abbott/us-en/home.html

They're a bit pricey if you buy them direct (sans insurance). It feels like you have an additional sense when wearing it.

[lytefm]

There are also a few startups (in the US e.g. Levels, Veri) which offer more insights than just using the libre sensor „as it is“. Unless you already know a lot about metabolic health, I'd recommend going that route over just getting the sensor.