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proper b12 injection technique Best Vitamin Site: Administering B12 Shots Injection Site For B12 Shot
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[1] [14] However, this doesn't mean all doses are completely without risk of adverse effects or interactions (for example, chloramphenicol may reduce the haematological response to B12)
Zaidel O, Lin HC

Heres the simple answer: The flu shot hurts because someone put a needle into your shoulder muscle and inserted fluid

We dont routinely check glucose levels when examining a cow, but if one of our vets diagnoses fatty liver disease (usually during LDA surgery), B12 is usually prescribed for treatment
