b12 injections subcutaneous or im Injecting Best Vitamin B12 Injection Site:
Description
this effect may be due to interference with erythrocyte maturation

Polycythemia vera has also been reported with parenteral methylcobalamin

Those prioritizing convenience may simply rotate through standard sites without concern for proximity to target fat areas

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In a clinical setting, vitamin B12 injections are rarely administered on a per day basis for long-term maintenance