Vitamin B12 Injection Dosage for Adults: 7 Key Facts & Guidelines Liv Hospital How To Self Administer Vitamin B12 Injections Invigor Medical How to Give A B12 at Home Best Site TikTok How to Give a B12 Injection: Step By Step Instructions B12 Injection sites + How to use B12 Shots Safely 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