Nisin is a natural preservative produced by the bacterium Lactococcus lactis. It is commonly used in the food industry to inhibit the growth of harmful bacteria, particularly Listeria monocytogenes, which can cause foodborne illnesses. Nisin is effective in various food products, including dairy items, canned foods, and processed meats. As a food additive, nisin is recognized for its safety and efficacy. It is classified as a GRAS (Generally Recognized As Safe) substance by the U.S. Food and Drug Administration (FDA). Nisin not only extends the shelf life of products but also helps maintain their quality by preventing spoilage.