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Q: You’ve written a lot about the value of vitamin D, especially for women living in overcast places. I live in Minneapolis and I’m wondering how much I should take every day. Also, I read that vitamin D is a fat-soluble vitamin and there are risks if you take too much. How much is too much?
A: You should get between 1,000 and 3,000 I.U. per day. Yes, there are risks with taking excessive vitamin D, but this is in the range of 25,000 I.U. taken on a daily basis, and over a long period of time.