vitamin b12 injection /cyanocobalamin/1000 mcg/2 ml Injection: Energy Boost and Anemia Treatment — Mountainside Medical Veterinarians may prescribe vitamin B12 injections to animals with a deficiency Vitamin B 12 Cyanocobalamin Injection
Description
With oral vitamins it can take days or weeks of daily dosing to build up the same effect

When Injections Are Medically Indicated People with certain issues might need B12 injections

It also has a direct effect on immune function
This is a great question because it gets to the heart of how your body processes nutrients
