Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief Nursing guidelines : Intramuscular Injections Deltoid Muscle Injection The deltoid muscle is a common site for intramuscular (IM) injections, especially vaccines! What gauge needle do you use for an IM injection? Answer in the comments! #medicationadministration #IMinjection # Intramuscular Injection (IM) OSCE Guide IM Injection Geeky Medics