This is the scary reason you should never use last year's sunscreen

Choosing the right sun cream is not always easy. It could be bad for your health, bad for the environment... for a few years now, UV protection has had some bad press. There is now another new obstacle: according to Ohmymag, the same tube should not be reused from one year to the next. Read on to find out more.

It's a reflex that many people have: as soon as the first rays of sunshine appear, you pull out your tube of sun cream thinking you're doing the right thing. We coat ourselves with the product, believing that we are protecting ourselves against UV rays. But after spending a year in the back of your closet, your sun cream may no longer have any protection.

This was explained to Numerama by Christine Lafforgue, a biologist at the Paris-Sud University: 'You can't keep sun cream from one year to the next: the molecules will be less effective at protecting the skin.'

Without you knowing it, a chemical process occurs in your tube of sunscreen. And time doesn't help it keep its properties.

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