Hi Pwcca :-)

that's a good question. Over at Curezone, at Humaworm's forum,-- he states his dewormer and tea are good for 2 years if kept in a cool dry place.

I'd say the same is true of most dry herbs.

Herbs in tincture form using food grade alcohol-- or vodka can last indefinitely--- according to MH of the Barefoot Herbalist forum at Curezone.

I would think that things like Coral Calcium or any of the mineral supplements can be kept indefinitely also.

Anything else, i'd keep in a cool dry place at least.