While I have never used expired b12 vials since a pharmacist told me not to I have used multi-use vials after 28 days when they are supposed to be discarded and unrefrigerated once opened as well
Storage: Store lyophilised vials in a cool, dry place
Neurological symptoms may sometimes feel different as recovery begins
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Regular retesting intervals allow for treatment optimization and ensure that therapeutic blood levels are maintained over time
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