Benefits of B12 Injections for Optimal Health B12 Injection Frequency: How Often Should You Get a B12 Shot? Liv Hospital B12 Injections for Energy: Benefits and How It Works AZ IV Medics Main benefits of B12 injections 1) Increased energy & reduced fatigue B12 helps convert food into usable energy Deficiency often causes tiredness, weakness, and low stamina 2) Healthy red blood cells Prevents How Often Are B12 Injections Given