A review of research studies shows that the average duration of B12 injection benefits is around 12 weeks
Sources Vitamin B12 - Consumer | National Institutes of Health VITAMIN B12: Overview, Uses, Side Effects, Precautions, Interactions, Dosing and Reviews | WebMD Article Vitamin B12 Deficiency: Causes, Symptoms, and Treatment | WebMD Living longer isnt enough if you dont feel your best
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Suspected adverse reactions to vitamin B12 treatments can be reported via the MHRA Yellow Card scheme
Afterward, you may feel: A mild boost in energy A little soreness at the injection site A slight flush or warm feeling shortly after These effects are usually mild and temporary
Finally, poor oral bioavailability, incomplete toxicology, uncertain long-term effects, and the absence of controlled human trials remain major limitations