Compounded Vitamin B Complex Injection Empower Pharmacy Hi I bought the B12 injectable liquid but there's no use by date on it or how long you have to use it once it's opened. Anyone know the answer? TIA x Hi I bought the B12 injectable liquid but there's no use by date on it or how long you have to use it once it's opened. Anyone know the answer? TIA x Feron 200 + B12: iron and vitamin B12 for piglets Elanco Do B12 Injections Need to Be Refrigerated: 6 Cool Solutions Pyridoxine HCl Injection (Vitamin B6 Shots), 85mg mL