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Totally fair question

If your doctor or health care provider is just rapid firing it in (which is always more painful), hitting the bone, you have Botox running down your face, it is more painful than when you get it done with other providers, or you get eye-lid droopiness (ptosis), you should think about moving on to someone with a more refined technique

This medication is taken once per week as part of a clinical weight management program, which may help individuals achieve their health and weight goals

So would it be the B12 deficiency causing the heart symptoms, not the B12 itself

Anaemia, megaloblastic | Treatment summaries BNF NICE