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We do in Denmark, but from what I understand, it’s not strictly necessary.
But do you buy them out of the fridge at the supermarket? That seems to be the main difference here
Yes, we do. They’re in the fridge in the supermarket, usually next to the milk.
In Spain we don’t. They’re in regular, unrefrigerated shelves.
Edit: but we (at least in my circles) keep them refrigerated at home, although I don’t know how necessary it is (I suppose it depends on the climate?)