vitamin b12 injection frequency Dose: 7 Guidelines for Adults How Often Can I Take

Your clinician or lab can advise whether anything should be paused before blood work

Avoid touching the needle to the glass bottom of the vial, as this might dull its sharpness

Less common B12 shot side effects include : Chest tightness Skin rash or hives Dizziness Difficulty breathing A blue tint to the skin Call your doc ASAP if you notice any of these negative effects

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