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1 Using expired sunscreen isn't as noticeable as drinking expired milk, but it can drastically reduce the sun protection you're getting. 2  It's best to discard expired bottles once they have reached the expiration date. 3  The downsides of using expired sunscreen are too high.
The FDA requires that all sunscreens retain their original strength for at least 2-3 years, and in order to make these claims the sunscreen formula has to undergo a series of real time or accelerated stability tests to prove that the ingredient is still active up until the time of expiration.