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Polycythaemia Vera: Treatment with B12 can mask the diagnosis of this blood disorder, so careful monitoring is necessary if B12 is started before a complete diagnosis
The deliverability can be increased if intramuscular injections are done in the site, or close to, the injury being treated
Who is most likely to need B12 injections
They are not strictly necessary for subcutaneous self-injection, but they reduce the chance of introducing bacteria during reconstitution
Monitor your overall health so that treatment stays appropriate and B12 is not masking another issue such as folate deficiency
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