Do You Need A Prescription For B12 Injections ThinWorks What is Vitamin B12 , Vitamin B12 is needed to form red blood cells and DNA. It is also a key player in the function and development of brain and nerve cells. Vitamin B12 binds to the protein in the VetOne Cyanocobalamin Vitamin B 12 Sterile Solution, 1,000 mcg mL, 100 mL at Tractor Supply Co B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Sublingual B12 vs Injection WhyNotNatural B12 Injection Dose: 7 Key Guidelines for Adults and Common Prescriptions Liv Hospital