give yourself b12 intramuscular injection Shots at Home: How, Where & How Often to Inject injecting b12 yourself How to
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Freeman AM, Morris PB, Aspry K, et al
How often are vitamin B12 injections administered during the initial loading phase

Helicobacter pylori link to pernicious anaemia

The only way to bypass this gastric defect is to get the B12 straight into the blood
