what size needle is used for b12 injections a Injection: A Simple Guide Is this the right size

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[1] Without intrinsic factor, dietary B12 cannot be absorbed effectively, leading to deficiency regardless of dietary intake

It certainly makes sense when you consider that vitamin B12 is stored in the liver at amounts that can sustain one's life for several years without any dietary or other sources, per ODS

It is an intracellular metabolic-enzyme modulator, which is why its research read-outs are things like NAD+ levels and adipocyte gene expression, not how full you feel. That mechanistic distinction is the single most important thing to understand before looking at any dose number

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