Out of date vials of B12 how stron Pernicious Anaemi Hi I bought the B12 injectable liquid but there's no use by date on it or how long you have to use it once it's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 AkfaLife B12 Vial 10 ml X 10 Oral Vial Akfa Life Vitamin B12 Vials Boost Energy & Neurological Health Pharmaroya Pharmaceutical Cosmetics Industry and Trade, OTC (Over the Counter), Food Supplements, Dermocosmetics, Delighted I received my B12. I don't see a use by date on them or am I missing it? B12 Shots Tampa FL, Urgent Care South Tampa Immediate Care