She had pernicious anemia, in which vitamin B12 is not absorbed from the intestine.
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The doctor is looking for vitamin B12 and/or folate deficiencies.
It is also possible to get vitamin B12 in 5 mg lozenges that can be taken up to eight times a day.
Rarely, inactivation of vitamin B12 may occur which can then interfere with folate metabolism which can result in bone marrow changes.
