how soon does vitamin b12 injection work Quickly Do You Feel Better After Injections? How Quickly Does a B12

Neurological symptoms, including paraesthesia and cognitive changes, improve more gradually and may require six months or longer

Relying on any single metric can be misleading

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But there is a grey/intermediary zone that exists (148-500 pmol/L ish), where patients may be deficient on a cellular level (in energy cycle and methylation) and wildly symptomatic including overt bilateral neurological symptoms, cognitive symptoms, severe fatigue (usually in the absence of anaemia) etc

Thanks to the presence of benzyl alcohol as a preservative, it helps inhibit microbial growth after repeated vial punctures