Vitamin B 12 Injection for Animals, 3000 mcg mL, 100 mL Vial Prescription Medication for Pets On The Go B12 Injection at enTrust Urgent Care Center Clinic FREE B12 injections the month of October no purchase necessary. 1 per a person. This is to show appreciation to our customers. It also allows new clients the opportunity to try vitamin Vitamin B12 Unflavored Shot Vitamin B12 Injection: Energy Boost and Anemia Treatment Mountainside Medical Vitamin B 12 Injection, 1,000 mcg mL