Here's a little more about pepsin:

* Where it's found: Pepsin is produced in the stomach and is most active in the acidic environment of the stomach.

* How it works: Pepsin breaks down proteins into smaller peptides, which are then further digested by other enzymes in the small intestine.

* Important Note: While pepsin is the primary protein-digesting enzyme in the stomach, other enzymes like trypsin and chymotrypsin in the small intestine also play crucial roles in protein digestion.