Understanding the B12 Vitamin Shot: Benefits, Risks, and Dosage Guide 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 Feeling tired, foggy, or low on energy? Vitamin B12 plays an important role in keeping your body functioning at its best. B12 injections may help: Individuals with low B12 levels Vitamin B12 Deficiency: Causes, Symptoms, and Treatment Where Can I Get a B12 Injection in Las Vegas, NV?