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For example, iron deficiency anaemia happens when the body does not contain enough iron

Tchkonia, T

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So the practical takeaway is not oral is better or SC is better. It is: pick one route, follow the documented per-dose figure for the vial you have, and keep the route constant so that whatever you observe is not confounded by a mid-stream route change

Also, IM is not necessary at all, as B12 has a long, documented history of effective SQ delivery