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Answers.comÂ® is making the world better one answer at a time. no...salt, sugar, flour...none of these expire. your epsom salt package might have an expiration date..probably indicating shelf life....generally how long it can be expected to remain on a shelf before it's effected by moisture.
All salts usually have additives in them that can break down over time: Table salt (NaCl) has iodine in it which breaks down. Many times moisture from the air contributes to changes in the long run. MgSO4 (epsom salt) likes to absorb water from the surrounding air. Once it does sufficiently, you will notice over time that it clumps together and forms nodules. If you see this, you can say that it has expired in a sense, it is not the same stuff as the day you bought it.