B12 INJECTIONS The Nurse Clinic B12 Injection Shots Order Online! 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 = What is the recommended needle size and gauge for intramuscular (IM) injections?
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