[verisimi]

Sounds so simple.... But how can one check vitamin D iu's for oneself? What machine is used, and how does it work?

Or is this a public relations piece from the mushroom marketing board?

[JLCarveth]

I would guess a GC MS[1]

- [1] https://en.wikipedia.org/wiki/Gas_chromatography%E2%80%93mas...

[verisimi]

Thanks. If that's it, it doesn't sound that amazing or accurate:

> A nonspecific test merely indicates that any of several in a category of substances is present. Although a nonspecific test could statistically suggest the identity of the substance, this could lead to false positive identification. However, the high temperatures (300°C) used in the GC-MS injection port (and oven) can result in thermal degradation of injected molecules,[3] thus resulting in the measurement of degradation products instead of the actual molecule(s) of interest.

from the wiki