Wow, that's interesting.

>Funnily enough, the research shows that peoples of African descent and Northern Europeans both have natural vitamin D deficiencies.<

Hmm. I wonder if they need the same amounts or if the amounts differ?

I can imagine Northern Europeans simply not getting much at all (but maybe not requiring tons).

And I'd at least guess that there could be two mechanisms at work in people of African descent - maybe because so much of Africa is SO sunny there's some rate-limiting of vitamin D absorption from the sun? Either that or over time because there was so much sun the body adapted to run optimally on more vitamin D than those in other climes... such that just getting a normal 'somewhere in the U.S.' dose of vitamin D from the sun isn't really enough.

Or, neither!

Will go experiment with some natural vitamin D this week. (I'm a very pale-don't-like-the-sun Northern/Western-European-descent person who feels best when it's overcast, storming, or night. So it may be interesting to see what a little extra natural D does for me, or to me.)