how long does b12 injections stay in your system Do Vitamins System? Full Guide How Long Does It Take

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What are the serious side effects

If you take metformin regularly, talk to your health professionals about getting screened for vitamin B12 deficiency

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

But a 10mg vial at 5mg per week gives only two doses, meaning you use up the vial in two weeks with potentially half the reconstituted volume unused