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 Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief What Happens If You Inject B12 Into Fat? PA Relief Not All Shots Are Created Equal Your Quick Guide to Injection Types , Ever wondered why some shots go in your arm muscle and others just under the skin? Heres the breakdown:, Intramuscular (IM)