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) : CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn Subcutaneous Injection: What It Is and How to Give One Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief How to Administer an Intramuscular Injection at Home