what do b12 injections do The Advantages of Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine B12 Injections vs Pills: Richmond's

(2017) Guideline for Primary Care: Investigation and management of B12/folate deficiency

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Bioorganometallics: Biomolecules, Labeling, Medicine

[95] Intramuscular or intravenous injection [edit] Injection of hydroxycobalamin is often used if digestive absorption is impaired, [2] but this course of action may not be necessary with high-dose oral supplements (such as 0.51.0 mg or more), [97] [98] because with large quantities of the vitamin taken orally, even the 1% to 5% of free crystalline B 12 that is absorbed along the entire intestine by passive diffusion may be sufficient to provide a necessary amount

Blood tests are conducted periodically to ensure that vitamin B12 levels are within the desired range and to monitor the resolution of anaemia