While the effects of a vitamin B12 injected will become noticeable around 24 hours after administration, they will start to take effect almost immediately and will stay in your system for around 1 week, but may vary depending on the metabolic rate of the patient
As with any injection, mild side effects can occur, and rare allergic reactions are possible
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Do note, pernicious anemia rarely visits alone
If your results come back below a certain level (typically under 180 pg/mL ), the deficiency is confirmed, and youll be prescribed injections at no cost
This would produce a misleadingly normal total B12 level in the face of functional B12 deficiency