Types of Injections, Same Needle Different Depths IV, IM, SC, and ID look similar but act very differently inside the body. This visual shows where each injection goes, how deep it travels, 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 How to Give a B12 Injection: Step By Step Instructions Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief Cobalamin (vitamin B12) and Folate Deficiency Province of British Columbia B!2 Inject Kit: Package Insert Prescribing Information