Vitamin B 12 Injection for Animals, 3000 mcg mL, 100 mL Vial Prescription Medication for Pets Do you follow a vegetarian diet? Did you know that vitamin b12 is mainly present in animal based products so those following a strict plant based are more likely to be deficient in vitamin Vitamin B12 Cyanocobalamin injection 1000 mcg Multiple Dose Vials Mountainside Medical B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn