INTRAMUSCULAR INJECTION SITES Intramuscular (IM) injections are given directly into the muscle, where the medication is absorbed more quickly than subcutaneous injections. There are several Nwokeiwu Valentine Vitamin Complex Injection Torrance, CA South Bay Medical Aesthetic Clinic, Inc. Are you feeling run down? Low Energy? A quick Vitamin B12 injection can help support energy, metabolism, and overall wellness. It delivers the vitamin directly into the muscle, allowing your body to Subcutaneous Injection: What It Is and How to Give One How to Give a B12 Injection: Step By Step Instructions Vitamin B12 Injections: Benefits and Risks