Vitamin C and B12 Injection Techniques VITAMIN B12 INJECTION 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 Practice Nurse Professional Resources for General Practice Nursing How to Self Inject Vitamin B12 at Home The Sanctuary Wellness Institute How To Give A Subcutaneous Injection And Sites The HCG Institute