how to administer b12 injection self-inject intramuscular vitamin - Overview Vitamin B12 Intramuscular Injection Instruction

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Flushing: If you experience flushing, drinking plenty of water may help reduce it

Additionally, B12 is involved in the metabolism of homocysteine, an amino acid that, when elevated, can increase the risk of heart disease

When to seek medical advice: Persistent or worsening injection site reactions (increasing redness, warmth, or discharge suggesting infection) Severe or persistent headaches Chest pain or palpitations Unexplained muscle weakness or cramps New or worsening neurological symptoms despite treatment Unexpected bleeding or bruising For non-emergency concerns, contact your GP or NHS 111