Vitamin b1, b6, and b12 Injection: The Complete FAQ Guide In 2025 AIPAK ENGINEERING Red liquid (vitamin B12) in a disposable syringe with a needle and in a glass ampoule on a white background. Lots of empty space Stock Photo Alamy Benefits of B12 Injections: Boosts energy levels & reduces fatigue Supports brain function & mental clarity Helps produce red blood cells Supports metabolism & overall wellness B12 Injections: Who Should Get Them and How Long Do They Last? Compounded Cyanocobalamin (Vitamin B12) Injection Empower