I think this is an absolute must read for everyone. The information is invaluable. It is quite horrifying what a lack of B12 can cause, and how easily it is overlooked by doctors to the point of putting it at the bottom of the list of things to investigate when things go wrong. It is such an easy fix, yet no one seems to take it into consideration. Even if you just store the knowledge for later on. I would say this is one of the top 3 books to have in your health library.