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Yes. It tastes bad, and if it has been sour for a long time bacteria MAY have grown in it. Many recipes call for sour milk, and if none is on hand it can be soured by using lemon juice or vinegar. In some countries, a treat is to eat sour milk over boiled potatoes. To most people it doesn't taste good, but if the milk was pastuerized it won't hurt to drink it or use it in a recipe. My coffee tasted odd today, not bad but somewhat tart. Then I noticed hours later that the milk I added to it smelled bad. It's been 6 hours since I had my first cup of coffee with the sour milk and I feel fine but in the future I would never intentionally drink sour milk. If the milk smells bad just throw it out. It's not worth risking getting sick or messing up your digestive system. At some point the milk will make you sick if it has turned bad, but apparently my sour milk had not reached that stage.

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16y ago

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