Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project How Often Should You Get B12 Injections? Infusion For Health What are Vitamin B12 injections Vitamin B12 injections are used to quickly raise your B12 levels when they're low or when your body can't absorb it properly from food or tablets. What 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