was a trick question
ah i don't want to seem as if i am flaming..i actually thought you may have read something that would surprise me
truth is - vit d is not even considered an essential vitamin, as the human body can synthesize from sunlight (as has been mentioned) or even tanning beds with UV rays
in developed countries, vit d is added to many things (milk the obvious but foods as well), so furthers this stance
there is even conflicting data from such respected places like the IOM here in the states (institute of medicine), and researchers claim IOMs data was conflicted, on
their (IOM) report of stating such conflictions..
is quite interesting stuff..sure there is the theory of increasing testosterone production as well (d3 variation)
for my .02 - if you don't get it from foods or sunlight, you'd better be supplementing with it
(rickets are not an attractive thought)
i like d3 version personally, and anecdotal reports say that supplementing extra in the winter will help mood (seasonal depression etc) and also strengthen immune system
if you take a multi, eat decently, and drink milk (oh gawd milk, there is another topic eh??
) one would seem to have all their bases covered
if you take a multi at all (minus the above factors), and it has standard vit d - one can really not take a stance that you
need to supplement additionally