any side effects of b12 injections Vitamin Injections: Good or Bad? Does the Vitamin B12 Shot

This is the practical reason a reader who is nervous about small-volume accuracy might prefer the 50 mg protocol the trade-off being that each vial carries fewer total doses, as the supply math shows next

[13] It is available as a generic medication and over the counter

[DOI] [PubMed] [Google Scholar] 122.Runnsj A., Liljedahl S., Sagna D., Ekblad M., Alenfall J

People with a severe deficiency or absorption problems can feel the effect wear off sooner

Your dosage depends on several things

It can be caused by not getting enough of this vitamin through your diet, problems with absorbing it, or taking a medication that interferes with its absorption