NEW TREATMENT ALERT A vitamin B12 injection helps treat or prevent deficiency by delivering the vitamin directly into the bloodstream. It's often used for people with absorption issues and is usually safe Compounded Hydroxocobalamin (Vitamin B12) Injection At Home Vitamin B12 4 Week Injection Package MUST BE A FLORIDA RESID CardioMender, MD Best Vitamin B12 Injection Site: Administering B12 Shots Vitamin B 12 Injectable for Horses, Dogs and Cats 1000 mcg 250 ml