What Syringe Size to Use for B12 TikTok B12 Shots Richardson Weight Loss Richardson Vitamin B12 Injections How to draw up Lipotropic (labeled as MIC B12) Injections Transformations Weight Loss Know Your Needles A Quick Nursing Guide! , Today, lets understand the different types of needles and their clinical purposes , Green Needle (21G) For IM injections like vaccines or like, swipe, and save for when it's your turn to do an injection on a patient Intramuscular (IM) Angle: 90 Needle Size: 2225G, 11.5 inch Med Examples: Vaccines (e.g. Tdap, Choosing the right needle is about matching the gauge and length to the specific task, whether it's a quick vaccination or drawing blood. Here is a simplified breakdown of the most common needles used