why do you need to have b12 injections Vitamin shot The Truth About B12 Injections:
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Many people notice improved energy within a few days, but full correction of levels may take a few weeks

[2] Hydroxocobalamin is administered via intramuscular or intravenous injection to treat and prevent vitamin B deficiency, particularly in conditions like pernicious anemia where oral B absorption is impaired

Most Im not sure conversations resolve with a small, clinically-indicated tweak at no extra charge

A challenge with this vitamin is that some people can eat plenty of B12-rich foods but still can't absorb it properly

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