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2-4 Months. 12 Months. Of course, the shelf life of M&M's is shorter if they are not stored properly. But remember that M&M's, like a lot of other sweets, usually have a best before date and not an expiration date. Because of this distinction, you may safely use them even after their best before date has lapsed.
Shelf Life of Mary Kay Products. Frequently I am asked about the freshness or shelf life of Mary Kay products, mostly from Ebayers who are considering a purchase. Shelf Life is the period of time that a product can be stored, unopened, and the conditions it must be stored in to remain suitable for use. If you notice any of these characteristics in any item you have, toss it. All Mary Kay products have a manufacture date, or date code.