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The NHS hypokalaemia overview explains why it matters, and clinical references such as StatPearls on B12 deficiency treatment specifically flag monitoring potassium during the early loading phase in people who were severely deficient

IM vitamin injections bypass the digestive system, allowing the body to absorb nutrients more efficiently

This is because it affects myelin production and damages nerves

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Some people also notice weakness, mood changes, poor concentration, or a general sense that they are not feeling like themselves