inject b12 into thigh Injections at Home - Safety Guide for Self-Administration B12 vitamin Store How to

Intramuscular injections are often used first

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It does

The injection : administered into your deltoid (upper arm) or, occasionally, the upper outer hip, by a licensed nurse practitioner or trained medical assistant under nurse-practitioner supervision

It's in 2 weeks

This depends on the severity of your deficiency, but many people start with a short loading course followed by maintenance injections every few months