Vitamin B12 Deficiency: Nerves & Big RBCs! "Sir, haath pair mein jhanjhanahat (tingling) kyu hoti hai?" If your patient is a strict vegetarian complaining of nerve pain and fatigue, B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Cyanocobalamin (Dodex): Uses, Side Effects, Dosage & Reviews Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function. CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL