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. Neurobion Injection: Uses, Dosage, Benefits & Side Effects B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Hangover Rescue Understanding the B12 Vitamin Shot: Benefits, Risks, and Dosage Guide