How B12 & Lipo Injections Support Weight Loss Efforts Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief How to Give B12 Injections at Home to Yourself PA Relief Hiya. I have a question. Is a B12 injection basically a dose of iron? Types of Injection Injection is a method of administering medication directly into the body using a needle and syringe. It allows fast and effective absorption of medicines. Intradermal (ID) How to Give Yourself Intramuscular (IM) Injections Patients & Families UW Health