Vitamin B12 Injection Dose for Adults: 7 Essential Dosage Facts & Schedules Liv Hospital 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. Compounded Vitamin B Complex Injection Empower Pharmacy Optimal Vitamin B12 Dosage and Treating Deficiency I receive monthly intramuscular vitamin B12 (cobalamin) injections, but my serum B12 level measured two weeks after the injection is only 268 pg mL; why is it low and how should the dosing