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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.
A: Expiration dates are often stamped on sunscreen containers to specify the time limit for a productâs stability and efficacy. For optimal sun protection as well as texture, stability, and sterility, use the sunscreen prior to the date listed. If you canât find a date on a new tube or bottle, write the month and year you purchased it in permanent marker on the tube. To test shelf life, manufacturers store a product at 40Â°C with 75 percent humidity; then at 40Â°C with 25 percent humidity; and then test it at 0, 1, 2, and 3 months.