How to Give a B12 Injection: Step By Step Instructions Is It Okay To Use A B12 Injection With Insulin Syringes? Q.) The appropriate needle gauge for intradermal injection is: A) 20G B) 22G C) 25G D) 26G If youre still guessing needle sizes were not doing that in 2026 , Heres what you MUST know:, Smaller gauge number = BIGGER needle, 1820G = blood & trauma, 2123G = IM, 2527G =
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b12 subcutaneous injection needle size Self-injecting vitamin B12. Quick and painless jabs after a B12… | by Dr Caroline Palmer