The most important place to start to determine how much D you needed is to have your vitamin D storage levels checked. This test will tell you if you are sufficient, insufficient, deficient, or in the toxic level; but these numbers are a greatly debated subject among various D researchers and doctor's in general. See our last post on the current numbers for these levels from Westcliff Lab Corp Inc. Finding out where you stand with your current levels will give you a good idea on how much...

