Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief Compounded Methylcobalamin (Vitamin B12) Injection, 5mg mL A Retired RN About Vitamin B12 Injections Intramuscular Injection in Deltoid Muscle with Z Track Technique 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 # Lipotropic MIC & B12 Injections Houston Concierge Medicine