"Rennet is used as a clotting agent to curdle the milk into cheese, separating the liquid parts of milk from the solids. Pfizer makes a genetically modified rennet, but because of a labeling loophole, cheese containing Pfizer's rennet does not have to be labeled as containing a genetically modified organism.

Today, there are four types of rennet used in the cheese-making industry: animal rennet, vegetable rennet, microbial rennet and a genetically modified version called FPC (fermentation-produced chymosin), made by Pfizer."

https://greenmedinfo.com/content/90-us-cheese-contains-gmo-made-pfizer

No wonder the pizza where I live tastes like crap. They use the Pfizer rennet cheese and you can't digest it.