B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Injection Frequency: How Often Should You Get a B12 Shot? Liv Hospital When that Vitamin B12 injection kicks in , B12 helps boost your energy, improve mood, support brain function & metabolism, and even strengthen hair, skin + nails , Who doesnt love a healthy B 12 Injections Specialists in San Antonio, TX How Long Does It Take Vitamin B12 Injections to Work?