how long does the b12 injection last Fast a Vitamin Shot Work? The Truth About B12 Injections:
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It is used to explore improvements in insulin sensitivity and glucose handling in metabolic research

Agsin in their guidelines

For instance, they can look for high methylmalonic acid (MMA) levels in your blood to confirm B12 deficiency

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In order to modulate astrocyte-derived factors of NVC, IGF-1 has to cross the bloodbrain barrier (BBB)

So, B12 injections can last for one month with slow release into the blood. In contrast, an IV (intravenous) infusion gives you the dose immediately so that you get the benefits immediately, and the effects are shorter lived
