Vitamin B12 Injection Dose for Adults: 7 Key Facts on Dosage & Frequency Liv Hospital B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics sandoz vitamin b12 10 000mcg 10ml 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. B12 Injection Dose: 7 Key Guidelines for Adults and Common Prescriptions Liv Hospital