Comment by comrade1234

Before you start taking crazy amounts (or any amount) of vitamin D just get a blood test. It's simple. As part of my insurance I can get a bunch of different blood tests, but I did have to pay about $50 extra to add the vitamin D test.

Based on the test I was just a tad under where I should be and so now I am taking 800 IU per day. I may stop in the summer when I get more sun.

I read somewhere that too much vitamin D has similar effects as too little (permanent hair loss, anemia, etc) but that may have just been on a blog similar to the linked blog on this submission.