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 China Copper + Vitamin B12 Injection 2% + 0.1% factory and manufacturers Lihua B12 expiry date Pernicious Anaemia Society Vitamin B12 Injection 2ml:0.5mg,1ml:0.5mg Suppliers, Exporters, and Manufacturers China Medicine
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