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Some people develop an autoimmune condition called pernicious anemia, which prevents the body from making a protein essential for absorbing vitamin B12
Theres no recommended upper limit for B12, so overdosing is not a concern
If it is not, he will tell you directly and recommend an alternative
but if it is you will probably need " loading doses " of 1mg every other day for two weeks or until there is no further improvement in your symptoms
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