does injectable b12 expire

does injectable b12 expire Hi I bought the 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

Name: does injectable b12 expire Hi I bought the 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
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Retrieved March 15, 2025, from U.S

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Following the CDC guidance of a 28-day refrigerated-use window, that works out to three 80 mg vials at the low 1.6 mg dose, three vials at the standard 3.2 mg dose, or four vials at the elevated 4.8 mg dose