B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium Is It Okay To Use A B12 Injection With Insulin Syringes? 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 Needle and Syringe Combos