Blood Draws & B12 Shots Neighborhood Naturopathic West Seattle Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide Common IM Injection Sites Deltoid (Upper Arm) Location: About 23 finger widths below the acromion process (shoulder bone). Best for: Vaccines and small volume injections (1 mL). Notes: Easy to access but limited Needle Injection Techniques Every Nurse Should Know! Whether you're prepping for your NCLEX or brushing up on your skills, here's a quick breakdown of the most common injection routes you'll encounter How to perform intramuscular (IM) injections Testosterone, B12, BCAA, HCG, & other IM Injectables