A Guide to the Best Needles for B12 Injections Precision Labs 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 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, Where Should Vitamin B12 Be Injected? A Real World Guide to Feeling Your Best Rejuve Aesthetics & Wellness B!2 Inject Kit: Package Insert Prescribing Information How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust