b12 injections ellenton What You Need to Know About Vitamin B12 Injections: Ultimate IV &

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While the effects of a vitamin B12 injected will become noticeable around 24 hours after administration, they will start to take effect almost immediately and will stay in your system for around 1 week, but may vary depending on the metabolic rate of the patient

Retrieved 2 March 2015

Its vital for doctors to adjust the dose based on each patients needs

[16] The European Food Safety Authority (EFSA) refers to the collective set of information as "dietary reference values", with population reference intake (PRI) instead of RDA, and average requirement instead of EAR