CAN expired buttermilk make you sick?

Online Answer
If the buttermilk has passed its expiration date, it should be thrown away. ... If you consume food past its expiration date it is more likely that you will develop a foodborne illness. In most cases, if you are using the buttermilk before the expiry date then it will be absolutely fine to use..
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Buttermilk is a good source of calcium and phosphorus, as well as vitamin D if it has been fortified. Full-fat varieties are also rich in vitamin K2 ( 5 , 6 ).
Pour buttermilk (1/4 cup for a quart jar or 1/2 cup for a half gallon jar) into your clean jar. Top off the jar with your plain milk. Tightly screw lid to the jar and shake vigorously for 1 minute. Place in a warm (but not hot) area out of direct sunlight.
So if you are baking cakes, cupcakes, biscuits, and such and looking for it to be even more similar to real buttermilk, use heavy cream or half heavy cream and half milk so it's just as thick as buttermilk, then add in the vinegar. ... All will work well in many recipes no matter what type of milk you choose to use.
Some common traits of bad buttermilk are a lumpy texture, a slight discoloration and a very distinctive unclean sour smell. If you notice any of these changes, your buttermilk has gone bad and should not be used.