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 body but not all injections are the same. Where to Inject Vitamin B12 Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Cyanocobalamin (b12) Injection 2,000 mcg mL 30mL Conquer Pharma Intrav My Store