are b12 injections intramuscular Optimal Injection Sites for Maximum Absorption and Benefits How to Give a B12

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How fast do B12 injections work

When to seek further advice Contact your GP or prescribing clinician if you: Experience severe or persistent nausea, vomiting, or abdominal pain Develop symptoms consistent with pancreatitis: severe upper abdominal pain radiating to the back, particularly after eating Notice signs of hypoglycaemia (shakiness, sweating, confusion) if you're also taking insulin or sulfonylureas Are concerned about rapid muscle loss or persistent fatigue during treatment Have purchased or used unlicensed peptide products and are experiencing adverse effects - seek medical advice without delay A full list of known side effects and drug interactions is available in the patient information leaflet supplied with your medication

Serious allergic reactions are extremely rare but require emergency medical attention if breathing difficulties or facial swelling occur

When to Retest HbA1c After Treating B12 Deficiency HbA1c should not be repeated until at least three months after starting B12 replacement, once haematological recovery normalisation of MCV and haemoglobin has been confirmed