How Long Does a B12 Shot Last Before It Wears Off? PA Relief Delighted I received my B12. I don't see a use by date on them or am I missing it? 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 Vitamin B 12 5000 mcg Injection 100mL 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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