The esophagus empties into the stomach, a large, muscular chamber that mixes food up with digestive juices including the enzyme pepsin, which targets proteins, and lipase, which works on fats.

In the following experiments, cytochrome c was modified by splitting off a great part of the protein portion of the molecule with pepsin. The resulting substance was then isolated and studied.

Pepsi’s site merely says ... a 1902 ad that says it “aids digestion” and a 1907 ad that reads ”[Pepsi] is an absolutely pure combination of pepsin ― for the ingestion ― acid ...

We have personally used Nutricost Betaine HCl + Pepsin and found it to be highly effective in improving digestion and reducing heartburn. The high-quality Betaine HCl + Pepsin complex ensures that ...

We’ve been using Nutricost Betaine HCl + Pepsin 790mg, 240 Capsules for several weeks now and have noticed a significant improvement in our digestion. The capsules are easy to swallow ...