Re: How much vitamin D do I need?

What do you consider vitamin D3 made from fermented yeast to be? How about vitamin D3 made from mushrooms (such as the white button mushroom)?   Whatever you call them, such food derived vitamin D is much superior to synthetic vitamin D.  As one example, food derived vitamin D3 has 10 times the antirachitic effect as does synthetic vitamin D.  I suppose it may be a matter of semantics, but when you get down to it, vitamin D is not really a vitamin in the first place.