Natamycin is a key ingredient in food preservation, especially for preventing spoilage and mold. Let's break down what natamycin is and the types of food it is commonly found in. What is Natamycin? Natamycin is a natural antifungal compound made by certain bacteria through fermentation. It's been used for decades to stop mold and yeast growth in foods. Unlike synthetic preservatives, natamycin is ...