Elevated vitamin B12 (marker)

Last revised by Dr Daniel J Bell on 14 Jun 2021

Elevated vitamin B12 (also known as hypervitaminosis B12 or hypercobalaminemia) is most important as a diagnostic and prognostic marker for malignant disease 1,3.

Very high serum levels of vitamin B12, following dietary megadosing, does not seem to have any observable deleterious effects 2

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