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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.
Sunscreen does expire. The molecules in suntan lotion (such as homosalate and octyl salicylate) block the penetration of UV radiation by acting as filters and absorbing and reflecting high energy UV. Over time these molecules break down and lose effectiveness, kind of like expired cold medicine or vitamins.