Some people believe that since sour cream is already sour, it has a very long shelf life.
The bad news is that it does spoil, and in fact, it spoils pretty quickly because mold and bacteria thrive in dairy products with sugars and proteins.
According to the safety regulations provided by the USDA, sour cream is safe and suitable to eat for up to three weeks following the sell-by date.
But this is true only if it has been kept in the refrigerator at all times and at temperatures of a maximum of 40 degrees Fahrenheit.
Once you open the sour cream, you should use it within the next 7-10 days.
Remember that sour cream is a dairy product and is very perishable and unsafe to eat if it has gone bad. This is the reason why it has a best-by-expiration date printed on it.
You should always return the sour cream to the fridge right after use to stay safe.
So, what happens if you forget the sour cream on the counter?
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