[wolfcreek]

http://www.acu-cell.com/acn2.html

Too many variables to count. Maybe this will help inform.

[neverdem]

Thanks for the link.

[brytlea]

I know the RDA for D is 400 iu, but there are those who believe that is very low. I’m not an expert, I can only say mine was really low. In nature we would make most of our D from sun exposure, we wouldn’t have fortified foods.