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 Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium A Guide to Needle and Syringe Choices Is It Okay To Use A B12 Injection With Insulin Syringes? 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, How Needle Gauge Affects Injection Comfort & Efficacy