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A 28-year-old female asked:

Drs can't figure out why i'm low b12, what could the cause be? i'm worried. many thanks

1 doctor answer1 doctor weighed in
Dr. Martin Rubenstein
Hematology and Oncology 45 years experience
Malabsorption: Low B12 levels are almost never due to diet. Some low B12 levels are not deficiencies but are due to low levels of the proteins in blood that bind B12. If truly low B12 malabsorption is present. Missing intrinsic factor (normally made in stomach) causes pernicious anemia. Disease or surgical absence of the terminal ileum (sm intestine) will also cause malabsorption of B12.

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Last updated Jun 24, 2014

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