B2 FAD supplement?

Hi all, anyone know of a way to get a FAD supplement?
As far as I can tell they are only available in Japan, but are very difficult to get if you are outside Japan.

Also any view on whether the enteric coated version of the oral tablet (which they sell in Japan), would actually deliver any meaningful amount of FAD into the bloodstream. (I’m referring of course to the fact that alkaline phosphatase tends to strip off the phosphate groups in the stomach and intestines, although it is not 100% successful at doing so).

I’m certainly not aware of any sub-lingual lozenge version of FAD. Although, interestingly there are ampoules available in Japan for injection.