Cyanocobalamin (Vitamin B12) Injection 1000 mcg mL, Multiple Dose Vial 1 mL, 25 Tray Vitamin B 12 Injectable Solution Santa Cruz Animal Health Vitamin B12 injections have been around for years but do you know who benefits most from them? B12 support may be a great option if you: Feel tired or low on B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function.