It would be helpful if local news reported the UVB index during the winter.
I am of the opinion that the sun is the best source for vitamin d as naturally metabolized vitamin D is likely to provide the best balance of the different forms of the vitamin.
BTW have you studied the connection between free fructose found in HFCS and invert sugar and vitamin D?
!WINE
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RE: I Read Way Too Many Studies About Vitamin D So You Don't Have To