When Should You Get a Vitamin B12 Injection? Soza Clinic How to Give a B12 Injection: Step By Step Instructions 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 FREE B12 injections the month of October no purchase necessary. 1 per a person. This is to show appreciation to our customers. It also allows new clients the opportunity to try vitamin How Often Should You Get Vitamin B12 Injections?