Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the B12 Injection sites + How to use B12 Shots Safely Know Your Needles A Quick Nursing Guide! Today, let's understand the different types of needles and their clinical purposes Green Needle (21G) For IM injections like How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust Guide to Needle Size Poster Amazon.com : 12 Gauge Veterinary Needles, Cattle Needle Poultry Injection Needles 10 Sticks, Suitable for Pigeons, Chickens, Ducks, Geese, Pigs, Sheep, Horses, And Other Large And Small Animals (12*20mm) : Patio, Lawn & Garden