How to Give a B12 Injection: Step By Step Instructions 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 = Insulin Syringes 31 gauge x 5 16", 0.5 mL by SureComfort Amazon.com: Ulove Prs 12 Pack 1ml Industrial Syringes with 25Ga 1 Inch Needle, Plastic Disposable Syringe and needle for Scientific Labs, Liquids Refilling and Measuring : Industrial & Scientific Understanding Needle Gauges and Injection Sites
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what gauge for b12 injections Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide