Multiple causese: There are several causes: low stomach acid, pernicious anemia, poor consumption of foods containing B12 and a genetic predisposition that requires more B12 like mthfr gene defect.
Answered 6/29/2018
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2 doctors weighed in across 2 answers
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A doctor has provided 1 answer
4 doctors weighed in across 2 answers
2 doctors weighed in across 2 answers
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