All spices lose their potency over time as the essence oils in the product breaks down. This happens in both sealed and unsealed packages.
I have vac-sealed and froze some rubs, whether or not it actually helped to extend the life is really debatable...
I found the best test is to: just taste it before you use it., If it tastes fine you can use it, or add to it.
I try to use my spices and rubs within 6 months, because I do not know how long it was on the shelf / warehouse.
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