Use your judgment: if the vial was stored perfectly, passes visual inspection, and is only slightly past BUD, many researchers make the informed decision to continue using it
Fournet M, Bonte F, Desmouliere A
[1] [3] Secondary carnitine deficiencies may happen as the result of certain disorders, such as chronic kidney failure, or under conditions that reduce carnitine absorption or increase its excretion, such as the use of antibiotics, malnutrition, and poor absorption following digestion
Patients should look for the exact substances and forms covered, the effective date, any interim policy, and updated guidance for pharmacies and prescribers