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For intramuscular injections, the common sites for B12 injections are the arm, upper buttocks, and thigh
Last clinically reviewed: 31 July 2026 Clinical information sources NICE NG239 Vitamin B12 deficiency in over 16s: diagnosis and management NHS Vitamin B12 or folate deficiency anaemia NHS Diagnosis NHS Treatment MHRA Vitamin B12 and cobalt allergy advice This page provides general information about the pharmacy service and does not replace personalised advice from a pharmacist, GP or other healthcare professional
It effectively resolved my concerns regarding bacterial growth during multi-dose applications over several weeks
It is promising but unproven
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