How To Self Inject B12 Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief 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 Common Injections Cheat Sheet Save for Ward Rounds! Insulin Diabetes Subcut 0.51 unit kg Vitamin B12 Deficiency Neuropathy IM 1001000 mcg Tetanus Toxoid What Happens If You Inject B12 Wrong: 6 Red Flags