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That being said, coverage for Vitamin B12 injections varies among insurance providers and may depend on medical necessity
The typical adult dosage is 0.25 mL to 2 mL per dose, depending on the severity of the deficiency or the clinical indication
In terms of how soon: some effects (like improved alertness) can be within a few days
It is important not to self-treat with high-dose B12 supplements before seeing your GP if you suspect deficiency, as this can interfere with diagnostic blood tests and potentially mask underlying conditions such as pernicious anaemia
It is usually administered intramuscularly by a doctor or nurse
If youre worried about pain they use tiny IV needles (22 gauge I think) and you can barely feel it
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