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how long is b12 injection safe after it's drawn up Shot: Step-by-Step Guide for Self-Injection Vitamin B12 Shots: Do They
Description
Selecting an injection site involves identifying areas with adequate subcutaneous fat
This chart may be useful as an overview: What Are The Symptoms of Vitamin B12 Deficiency
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Like all medical treatments, B12 injections may cause mild side effects in some individuals

Whether they hurt or not depends upon the skill of the giver
