How Long Does It Take Vitamin B12 Injections to Work? 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 Are expired vitamin b12 syringes still effective? 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 How Long Do B12 Injections Last: 5 Ways to Extend Effects
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what happens if you inject expired b12 Do HCG Injections Expire?