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However a blood serum test merely indicates how much B12 is swimming around in the bloodstream, NOT what is actually getting into the cells where it's needed for use by the body
According to WebMD, The more common B12 injection side effects are: Swelling at the injection site Mild dirhhea Itching Swelling in the body Low potassium (weakness, irregular heartbeat) There is a case report of an anaphylactic reaction to a B12 injection in a 55 year old women receiving cyanocobalamin, but these reactions are thought to be rare
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Initial assessment typically includes full blood count, serum B12, serum folate, and anti-intrinsic factor antibodies, with coeliac testing if indicated
Emily Ward