To be clear, the research has been going on for a while.

But extracting an accurate enough signal from noise through the skin is an incredibly complex signal analysis problem. And there are multiple approaches.

Nothing has FDA approval yet because it's a major question whether any technology developed thus far is accurate enough. I understand there's at least one clinical trial going on right now. Fingers crossed...

Very neat! If they can crack this, I might actually bite and finally buy one.

This is pretty much the holy grail, that would make the first person to crack it crazy rich.

So the quick answer is: no, not even close. Also, you would somehow have to measure a very low concentration of soluble chemical in a fluid with always changing composition of a bunch of chemically similar other constituents across relatively wide tissue layers that themselves have a lot of that same chemical..

It's absolutely sci-fi.