Giving Your Cat a Vitamin B12 Boost. The Art of Doing Stuff Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods Liv Hospital Nova B12 10ml Vial 1mg ml NovaNAD+ Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and keeping nerves