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Is it true that once a suncream is opened the SP factor of it starts to diminish?

I have heard that if you re open a suncream a year later (for your next holiday) that the SP factor would have gone down eg? factor 50 becomes factor 40?!!


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Patty Inglish, MS profile image94

Patty Inglish (Patty Inglish, MS) says

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6 years ago
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