Most people have no idea they’re eating a genetically modified enzyme originally developed by Pfizer—yet it’s quietly used in over 90% of American cheese products, and thanks to an FDA loophole, you’ll never see it on the package.
While most Americans think of Pfizer as a vaccine and drug manufacturer, few realize the company has quietly embedded itself deep within the food supply—modifying what we eat without our knowledge.
At the heart of the issue is chymosin, an enzyme used to curdle milk and solidify it into cheese. Traditionally, this enzyme came from the stomach lining of calves.
But in the 1990s, Big Pharma giant Pfizer introduced the first genetically engineered version of chymosin, produced using GMO yeast, bacteria, or fungi.
The U.S. Food and Drug Administration (FDA) approved Pfizer’s bioengineered chymosin in 1990, declaring it “generally recognized as safe” (GRAS), and the product quickly conquered the industry due to Pfizer’s “extremely aggressive” marketing strategy to destroy any competition.
Today, roughly 90% of cheese in the U.S. is made using Pfizer’s mysterious GMO lab-made enzyme.
Most consumers are unaware of this shift, largely because these genetically engineered enzymes are exempt from GMO labeling laws.
Since they’re considered “processing aids” and not ingredients, companies aren’t required to list them on packaging.
So the American cheese on your kid’s sandwich, the slice melted on your fast-food burger, or the shredded cheese topping your pizza—all likely contain bioengineered enzymes made using GMO microbes.
And the company behind it? Pfizer.
This should raise red flags. Pfizer is no ordinary food supplier. It’s the same corporation that paid a record $2.3 billion fine in 2009 to settle charges of illegal drug marketing and fraud. It’s the same company that helped develop the controversial mRNA COVID-19 shot, bypassing long-term testing while securing legal immunity for side effects.
And now, this same company helped lay the groundwork for GMO-based food processing without your knowledge or consent.
Even after spinning off its animal health division into Zoetis in 2013, Pfizer’s fingerprint remains all over the genetically engineered tools used in industrial agriculture and food manufacturing. Zoetis, which inherited Pfizer’s biotech patents and research, continues to produce GMO-derived enzymes for dairy processing today.
So what’s the concern? For one, the long-term health effects of consuming GMO-derived microbial enzymes remain largely unknown.
While companies and regulators insist these substances are “identical” to natural ones, independent research on potential allergenicity, gut microbiome disruption, or unintended side effects is extremely limited—if not actively discouraged. Most safety studies are either industry-funded or kept behind closed doors.
Even more troubling is the lack of transparency. Why are multinational pharmaceutical corporations allowed to infiltrate the food supply without disclosure?
Why is the FDA, which receives industry funding through “user fees,” so willing to rubber-stamp biotech products from companies like Pfizer—especially given its past criminal convictions and revolving-door relationships with regulators?
For vaccine skeptics and health freedom advocates, this isn’t just about cheese—it’s about control. It’s about how the same corporations that pushed experimental gene therapies are also quietly influencing what ends up on your plate. It’s about how biotech and pharma giants have embedded themselves in agriculture, nutrition, and now even the climate agenda—often with help from institutions like the World Economic Forum and Bill Gates–funded foundations.
At a time when consumers are demanding clean labels, natural food, and transparency, it’s worth asking: should we really trust Pfizer—the same company behind the COVID shot, the opioid scandal, and the largest healthcare fraud fine in U.S. history—to help make our cheese?
If you’re concerned about GMO foods, vaccine-derived technologies in agriculture, and corporate influence over your diet, start reading the fine print. Better yet, support small-scale farmers, look for non-GMO certified or traditional cheeses made with animal rennet, and don’t assume “American cheese” has anything to do with real food anymore.
Because when Big Pharma is in your food, it’s not just about flavor—it’s about control.