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[9] No overdosage or toxicity has been recorded by the FDA

Vitamin B12 is found in food of animal origin, in milk (products), eggs as well as meat and especially in offal

All of it the fear I grew up with, and the strength I found in the Army to finally stand on my own ground taught me the same lesson from two different directions: how precious it is to feel safe

Adults 2.4 mcg

Also, some people have trouble properly absorbing the nutrient because of issues involving the GI tract or lack of stomach acid

Additional information Peer review information Nature Metabolism thanks Dominique Langin and the other, anonymous reviewers for their contribution to the peer review of this work