Vitamin B12 Injections: Hot Shots? Full Guide PA Relief On The Go B12 Injection at enTrust Urgent Care Center Clinic Lipotropic B12 L Carnitine Injection In Reno, NV 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 Pharmaceutical Manufacturing Company, Pharma Supplier & Exporter Surat India B12 vitamin Store How to Read the Date Codes On Your Vitamin B12 and B Complex Packaging