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. Vitamin B12 Injections: Good or Bad? How Often Can I Take B12 Injections? B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Sublingual B12 vs Injection WhyNotNatural Low energy, brain fog, or feeling off? Vitamin B12 could be the missing piece. B12 supports energy, metabolism, and nervous system health, and injections provide optimal absorption for those who need