Americans Ditch Cheese After Learning Pfizer’s Ingredient Is Now Found in 90% of Dairy Products

Many Americans were surprised to learn that roughly 90 percent of cheese contains a lab-made enzyme developed by Pfizer, and it does not have to be labeled.

The ingredient, known as fermentation-produced chymosin (FPC), is a genetically engineered version of rennet, an enzyme used to coagulate milk during cheesemaking.

While FPC has been used for decades, a viral social media post this week brought renewed attention to its origins, sparking widespread backlash and calls for greater transparency.