side effects of b12 injections hydroxocobalamin Common & Rare Vitamin Sublingual B12 vs. B12 Injections:

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Vitamin B12 is usually safe, but there are times when you should be careful

You can self-inject the drug into your abdomen or thigh

The BNF advises that patients presenting with neurological symptoms should receive 1000 mcg i.m

Typically, whole blood concentrations are measured, and they are about 50 times higher than plasma concentration