There is not a certain expiry date, however it's best used within a year of purchase, and best kept in an air tight container! Time does not make it better. Enjoy!
I recently watched the Tea episode of Alton Brown's show he suggested a shelf life of approx. 1 year if I remember correctly, after that it may impact taste. foodnetwork.com/good-eats/true-brew-2-mr....
If anything, the tea will get weaker or stale tasting with age as the aromatic compounds break down. You shouldn't be worried about it making you sick. I am not a doctor.
I beleive that it does go bad I do not think that its like wine and can get better over time.
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