Types of injections explained! Understanding the angles: intramuscular (im) : injects deep into the muscle at 90. subcutaneous (sc) : goes under the skin at 45. intravenous (iv) : Vitamin B12 Injections: What You Need To Know Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods Liv Hospital Treating Severe Vitamin B12 Deficiency B12 IM Injection CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics