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Pernicious anemia, one of the causes of vitamin B12 deficiency, is an autoimmune condition that prevents your body from absorbing vitamin B12
Its absolutely critical to remember that B12 injections are a Prescription-Only Medicine (POM) in the UK
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PubMed, Wthrich, B
When serum B12 falls in the gray zone, methylmalonic acid testing is recommended to clarify whether a functional deficiency exists
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