b12 injectable for gamefowl RedGold Vitamin Conditioning 250 mL and 500 mL vials Provides 1 Vitamin B-12 1000 Injection (VetOne),
Description
2 In pernicious anemia, the deficient levels of vitamin B12 are due to the body lacking the intrinsic factor that forms a complex with vitamin B12 which allows absorption into the gut

Current Cardiology Reviews, 9(1), 3354

Cyanocobalamin BNF Drug Monograph
According to clinical research parenteral administration (intramuscular or intravenous) is preferred over other drug administration routes in case of emergency situations as it provides first-pass metabolism avoidance, reliable therapeutic concentrations and better bioavailability of dosage (2) It can also be used in situations when oral route is not feasible
