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You can absolutely get D3 supplements! The FDA recommended dose is still only like 400iu, but most supplements are >1000iu. Seems like 2000iu is pretty common, but they also make 5000iu's as well.
I just took one, as a matter of fact.
Bear in mind, though, that it's a FAT SOLUBLE substance...meaning, it builds up. You can O/D on it, though what I've read indicates that you'd have to take many hundreds of thousands of IU's a day for a long period of time. I would definitely suggest going to the doc, having them do a 25-hydroxyvitamin-d test (NOT a
1,25-
dihydroxyvitamin-d, as that's the wrong test!) to get a baseline. If you don't supplement, and you don't get out in the sun much...or if you wear sunscreen, cosmetics with SPF, hats, sunglasses, long sleeves, long pants, and all the other stuff we've all been instructed to do...your levels are most likely deficient.
Personally, I believe Vit. D3 deficiency to be reaching epidemic proportions in this country. But, that's just an opinion.
Go get checked, though.