by Dr. Joseph Mercola, Green Med Info:

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.

Story at a glance:

• Traditionally, cheese was made with just four ingredients: milk, salt, starter culture and animal rennet.