One thing I discovered recently is that the most common vitamin D test significantly undercounts D2, although there is another test that is more accurate in tha

One thing I discovered recently is that the most common vitamin D test significantly undercounts D2, although there is another test that is more accurate in that case (I'm guessing it is also more expensive). Since D2 is added to a number of processed foods these days, many people who test low with the common test may not actually be low.