I have found it to be true that keeping your vitamin D levels up will really help the most with cold and flu viruses. Vitamin D deficiency is actually in plague proportions in much of the world, even when people live in sub-tropics, because people avoid going in the sun. Now, I am one of those people, because I have always been one who burns easily, but taking natural vitamin D3 in high enough doses will actually help boost and maintain vitamin D levels. My vitamin D originally tested dangerously low, but I eventually got it up to low normal and have been able to steer clear of cold and flu viruses for the first time I can remember. A good place to get vitamin D3 at a high enough dose for a reasonable price can be found at this link: http://www.swansonvitamins.com/SW1030/ItemDetail?n=4294967184 It's even often on sale for less than this. The RDA of vitamin D is too low for people, especially in the winter time. Here is a list of articles talking about vitamin D and how important it is for your immune system: http://search.mercola.com/Results.aspx?q=vitamin%20D&k=vitamin%20D He talks about adults needing to take 4,000 mg of vitamin D3 everyday during the winter time, but once my vitamin D levels were up to low normal, my naturopath told me to go to 2,000 mg. Taking the 4,000 mg everyday while your vitamin D levels are too low will raise your vitamin D levels. My guess for why my naturopath had me drop down to 2,000 mg everyday is because 4,000 mg everyday will continue to raise the vitamin D levels and having too high of vitamin D levels is just as bad as having too low of vitamin D levels. It took me nearly a year to raise my vitamin D levels to low normal, though, and since most people are deficient, 4,000 mg is probably fine for most people to take. But, the key is getting the vitamin D levels tested regularly. So, one should probably start with 2,000 mg everyday, since that's the maintenance dose, then be sure to get tested as soon as possible.
I know from my own experience how important this is, and I know about the vitamin D deficiency epidemic. I also know how much more important vitamin D levels are for CFS/FMS patients and anyone else dealing with auto-immune problems. Mine was so low that the test almost couldn't even measure it. That's downright dangerous!
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