How to Give a B12 Injection: Step By Step Instructions Best Vitamin B12 Injections Dosage And Frequency PA Relief Does size matter? Historically, a bigger needle gauge was considered better to prevent damage to red blood cells. However, our recent guidelines recommend using smaller gauge needles (2325 G) for all How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust
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what size needle should be used for b12 injections Ivy Grove Surgery : Self-administration of B12 injection