How to Give a B12 Injection: Step By Step Instructions What Size Needle for B12 Injection? What syringe volume and needle gauge and length are appropriate for intramuscular vitamin B12 (cobalamin) injection in an adult, and what is the recommended dosing regimen? Ivy Grove Surgery : Self administration of B12 injection
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syringe size for b12 injection How to self-inject intramuscular vitamin B12 - Overview