side effects of too much vitamin b12 injections Injection and Safety High Vitamin B12 Side Effects:

Both these methylation reactions are vital for growth and cell reproduction

Our pharmacy team will explain the service clearly, check suitability where needed, and help you choose the most appropriate next step, whether that is an NHS service, a private appointment or advice from another healthcare professional

However, as described below, there doesnt seem to be a benefit for neurological problems in going beyond the amount of B12 generally recommended by the EFSA

Metformin tops this list, with well-documented effects on b12 levels

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Reach your care team with questions about dosing, side effects, or your progress