[RummyChick]

There is a really good article on this on the Mayo clinic website that goes into detail about the various problems with b12 and how often doctors get it wrong and why testing for it is problematic. I think the many faces of cobalamin is part of the title

[ProtectOurFreedom]

Thanks for the referral to the Mayo Clinic article. Here it is...

Volume 3, Issue 2P200-214
June 2019

The Many Faces of Cobalamin (Vitamin B12) Deficiency

Autors:
Bruce H.R. Wolffenbuttel, MD, PhD
Hanneke J.C.M. Wouters, BSc
M. Rebecca Heiner-Fokkema, PhD
Melanie M. van der Klauw, MD, PhD