Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn How to Give a B12 Injection: Step By Step Instructions Where to Inject Vitamin B12 Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL