But, what’s the difference between dihydrovitamin D and vitamin D and which one is in dairy? [/quote]
1,25 Dihydrovitamin D is a Hormone, a final metabolite of Vitamin D (under control, so intake of vitamin D does not always lead to increased levels of 1,25(OH)2 VitD.
vitamin D in dairy is the food souce of something that can be generated invivo (part of cholesterol metablolism into Vitamin D in skin)
[quote]In any event, vitamin D being a fat soluable vitamin would be lessened when the fat is removed from dairy, no?[/quote]Sorta, it gets complicated… the term fat soluble is a tad awkward. as they are essentially lipids, they do not need additional lipids per se to be taken up. If they are within the product, without additional fat, they can be taken up within the gut. Seeing how they are lipids, it is difficult within the average diet to get enough without eating adequate fat, not that the fat increases their uptake. If there is 0.1% fat in a dairy product, and they fortify it with Vitamin D, it will still be absorbed. I have a better description of it somewhere, I think at work.