How Long Do B12 Injections Last? Vitamin B 12 Injection, 1,000 mcg mL at Tractor Supply Co Buy Cyanocobalamin (Vitamin B 12) 1000mcg ml (10ml Vial) Online HealthWarehouse 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
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