How Often Should You Get B12 Injections? Yes, Vitamin B12 injections are definitely worth considering!, Vitamin B12 is essential for many bodily functions, and a deficiency can show up quickly since its water soluble and not stored in the How often should vitamin B12 injections be administered and how frequently should laboratory monitoring be performed? Do You Need a Prescription for B12 Injections? OmegaQuant Compounded Hydroxocobalamin (Vitamin B12) Injection