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Have sunscreen left over from last summer? Throw it out

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If you have a bottle of sunscreen left over from last summer that’s already been opened, you shouldn’t use it. Better to throw it out and buy a new one instead, a prominent dermatologist advises. Having been exposed to oxygen, the sunscreen’s contents will have changed under oxidation and can no longer properly fulfil their protective function, explains Dr Eckhard Breitbart, chairman of the Hamburg-based Dermatological Prevention Working Group (ADP) and a German Cancer Aid (DK) expert. But that’s not all. “Substances can form that may well be carcinogenic,” he says, though he adds there’s no “…

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