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With weekly dosing, blood levels build up over about 4 weeks before stabilizing at roughly 1.6 a single dose

Vegetarians and vegans especially need to be careful and consider supplements, as most common vitamin B12 food sources do not fit with these diets

The lower end side effects include nausea, diarrhea, constipation, low blood pressure, and vomiting

Because of this and the fact that the body only needs a small amount of vitamin B12 each day, it can take up to a year or even longer for an inadequate vitamin B12 to manifest as an apparent deficiency

Do not assign both without clear documentation of co-existing distinct conditions