I have no clue but wanted to share something about it and for sure that Rose and others saying docters are confused and know little about it is true. I have seen like many here a lot of docs and have asked this ? to all. I have gotten a variety of responses and a variety of what they feel I should supplement or not. Very confusing in general.I'm wondering if a holsitic docter would be more informed and lead each individual to what their body needs rather then the typical doc who is more about meds?