What types of cheese are not kosher?

- Cheeses that contain rennet from non-kosher animals:

Most hard and semi-hard cheeses such as cheddar, parmesan, and mozzarella, as well as some soft cheeses like brie and camembert, are made using rennet, an enzyme that helps coagulate milk proteins. If the rennet is derived from non-kosher animals, such as pigs or rabbits, the cheese is not kosher.

- Cheeses that are mixed with non-kosher ingredients:

Some cheeses are blended with other ingredients, such as meat, fish, or shellfish, which makes them non-kosher. For example, some blue cheeses are made with pork fat, and some processed cheeses may contain gelatin derived from pork or beef.

- Cheeses that are produced in a non-kosher facility:

Even if a cheese does not contain any non-kosher ingredients, it is still not considered kosher if it is made in a factory that also processes non-kosher products. This is because there is a risk of cross-contamination, where kosher cheese could come into contact with non-kosher food or ingredients.