[allmost]

Which forms of vitamin D were they testing for? There are more than one, D3 and D6 mainly.

[allmost]

Let me be the first to call myself an idiot D₂ and D_3.

[decimon]

Which forms of vitamin D were they testing for?

This article doesn't say so I don't know.

There are more than one, D3 and D6 mainly.

As supplement, I'm familiar with D2 and D3. D2 used to be the common supplement but has been replaced by D3 as D3 is the form we make naturally and is so thought to be better utilized. I recently posted something with the opinion that D2 may be as beneficial as D3.

That summarizes my readings on the matter.

[neverdem]

Which forms of vitamin D were they testing for? There are more than one, D3 and D6 mainly.

PROVISIONAL INTERNATIONAL UNION OF PURE AND APPLIED CHEMISTRY and INTERNATIONAL UNION OF BIOCHEMISTRY JOINT COMMISSION ON BIOCHEMICAL NOMENCLATURE* NOMENCLATURE OF VITAMIN D PDF

D6 is listed at the end of page 6, the last page.

25-hydroxy vitamin D test

You can find it written as 25(OH)vitamin D. Some docs aren't thrilled with its methodology. My guess is a problem with the reproducibility of results.