[Candace]

The optimal amount of vitamin D in the blood serum seems to be around 50-70 ng/dl.

http://anabolicmen.com/vitamin-d-testosterone/

It makes me lose faith in humanity to see this recommendation all over the place. (I should note that I'm not mad at you Lotus - that would be shooting the messenger.) No one ever cites any evidence to back it up. Well, LEF did provide a bunch of footnotes in one of their magazine's articles, but when I looked up the papers, not a single one supported going over 50 ng/ml. (Notice how the bro-science website didn't even get the units right. They used the ones you'd use for total testosterone.)