How Often Should I Take Vitamin B12 Injections 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 B12 Injections: How Often Should You Take Them? Invigor Medical It might not be your lifestyle it could be a B12 deficiency. B12 is essential for energy, mood, and overall wellness and when levels are low, your body feels it. Our Vitamin B12 Injections Energy Boost The Center Medical