can b12 injections cause swelling Common Side Effects From Vitamin Shots Vitamin B12 Side Effects: Risks

Priming (Activation) of Pump Before the first dose and administration, the pump must be primed

Women who are severely deficient in vitamin B12 during pregnancy have an increased chance of having a baby with defects or having the baby miscarried

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Other reported effects include: Headaches and dizziness Nausea and gastrointestinal discomfort Allergic reactions to B12 formulations (rare) If you experience symptoms suggesting a severe allergic reaction (difficulty breathing, severe rash, swelling of face/throat), seek emergency medical attention immediately by calling 999 or attending A&E