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. Hydroxocobalamin Injection: Vitamin B12 for Energy & Anemia Mountainside Medical CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL Vitamin B12 Injections Dosage and Frequency IVBoost Vitamin B12 Injection Dosage Guide: 7 Essential Dosage Facts for Adults Liv Hospital