Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods Liv Hospital How Often Can You Get a B12 Shot for Maximum Health? B12 Shots at Home: How, Where & How Often to Inject Yourself 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