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Suntan lotion or sunscreens do not lose their effectiveness very rapidly, but eventually oxidize or clump. Some lotions containing organic chemicals can be substantially degraded within a year or two after being opened, but will still offer some protection. If you find that it is not working as well as needed, you should buy new lotion. The shelf life of some products is 3 years.

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Q: When should you throw out suntan lotion?
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