The FDA requires that all sunscreens maintain their full strength for three years—so, if you have leftover sunscreen at the end of the summer, you should be able to safely use it for two more summers. Some sunscreen manufacturers print the expiration date on the bottle or label, but not all do. When you buy a bottle of sunscreen, check for an expiration date. If it doesn’t have one, write the date of purchase in permanent marker on the container.
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