B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. Subcutaneous (SC) and Intramuscular (IM) Injections Must Knows for Subcutaneous administration: Pinch skin with non dominant hand and hold syringe with dominant hand Always inject: 2 inches away from umbilicus (for abdomen) 3 inches 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 VITAMIN B12 INJECTION 1000 mcg mL