Propionate is a type of fatty acid that occurs naturally in the body and in some foods. It is produced during the fermentation of dietary fibers in the gut and is known for its role in energy metabolism. Propionate can also be found in certain cheeses and is used as a food preservative to inhibit mold growth. In addition to its dietary sources, propionate is significant in the field of biochemistry. It is a key intermediate in the Krebs cycle, which is essential for energy production in cells. Researchers are studying its potential health benefits, including its effects on metabolism and gut health.