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 expired vitamin b12 injection is

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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

Where is the B12 injected

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[1] For example, if a 2 mL dose (full 200 mg thiamine, 200 mg niacinamide) is to be given IV, a nurse might mix it into 50 mL of saline and infuse over 15-30 minutes