Vitamin B12 Injections for Aging and Longevity InVita Wellness 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 self administer subcutaneous B12 injection., 1. Withdraw proper dosage from vial into an insulin syringe, 2. Clean site of injection (abdomen or other proper site), 3. Pinch the skin where you IM injection sites (intramuscular injections) made easy for nursing school students, nurses, and more! This includes a quick summary of the IM injection sites, along with some details such as landmarks and Where to Inject Vitamin B12 Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide