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I have had unsalted butter in the fridge for a while and used it from time to time. Now I realize that's it's been there for many, many months. It tastes fine but is it safe to keep it longer than a month?

Padma
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Oxidation can make the fat in the butter rancid. You would taste and smell that, so it's probably safe. Refrigeration and darkness slow the process of oxidation.

I freeze butter and take it out of the freezer a stick at a time. Butter appears to last approximately forever if frozen.

Bob Brown
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