[theshrike79]

The point wasn't the dose, I just picked a number out of my ass.

The point is that from that N IU the 100 people will absorb anything from 0-N, it's very individual and varied.

The only way to be sure is to test your levels, which costs money every time. There really should be a simple and cheap home test kit for it. You'd sell millions every year just in the Nordics and Canada =)

[Etheryte]

Maybe this comes across snide, but have you been to the Nordics? I can get tested at my GP for free practically as often as I'd like, I doubt you'd sell too much in the way of home test kits.

[theshrike79]

Been living here my whole life.

I've been offered a (free) Vitamin D checkup exactly zero times. We should be getting them though, dunno why we don't.