That is a hard question. If you are 50 or above, or take acid blocking drugs, you are at risk for low B12 just for those 2 reasons. If you are young, then the only big cause is lack of intrinsic factor (autoimmune or genetic), or long standing vegan lifestyle, or use of acid blocking drugs or metformin.
Its your decision in the end.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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