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For B12 Deficiency If you have a vitamin B12 deficiency, the initial dose is usually 30mcg injected under the skin or into the muscle every day for between 5 and 10 days to boost levels of B12 quickly

Explore B12 Shots & Injections: Uncover What is a B12 injection, weighing the pros, cons, and alternatives for well-informed choices

Rarely, serious allergic reactions or anaphylaxis can occur

Retrieved March 21, 2020

Subcutaneous injection is a skill that improves with practice and proper instruction

The EFSA notes, The inherent uncertainty of this [factorial] approach is reflected in the wide range of cobalamin intake calculated to compensate for estimated daily losses, depending on the assumptions taken (EFSA, 2015). Appendix D