Vitamin B12 Injection Dose for Adults: 7 Essential Dosage Facts & Schedules Liv Hospital Cyanocobalamin (B12) Products American Regent B12 Injection DRIP AND DIP 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 Cyanocobalamin Injection: Vitamin B12 Deficiency Relief Mountainside Medical Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff