what happens if you inject b12 into vein Wrong? · PA Relief Injecting B12 into fat: 4
Description
CoA included.

Common Side Effects: Mild pain or irritation at the injection site

Serious Side Effects: Hypersensitivity or anaphylaxis (extremely rare), bronchospasm

Vitamin B12 deficiency can occur due to many reasons, mainly improper diet or you have a condition where your body can't absorb as much.

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Vitamin B Complex package insert / prescribing information for healthcare professionals
