A member asked:

What causes high levels of vitamin b 12?

A doctor has provided 1 answer
Dr. Klaus d Lessnau answered

Specializes in Pulmonary Critical Care

High intake: usually from MVI (multivitamin) or additional intake. Unlikely to be from fish. You would have to eat a lot. Even better, no side effects from high B12.

Answered 7/24/2014

3.9k views

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