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In the case of vitamin B 12 there is no UL, as there is no human data for adverse effects from high doses

If a person has both low b12 and low iron then their red blood cells may appear to be normal sized with normal range MCV and MCH due to the effects of the iron deficiency masking the effects of the B12 deficiency

Dickinson CJ

Although dairy and meat products are usually considered good food sources of vitamin B12, the actual B12 levels contained in these products tend to vary greatly, as livestock is regularly supplemented with B12 injections to avoid deficiencies, making for a less than reliable (and natural!) source