Monosodium glutamate (MSG) is a flavor enhancer that is sometimes used in sauces and mayonnaise. It is the sodium salt of glutamic acid, an amino acid naturally found in various foods. MSG is known for its ability to enhance the savory taste, often referred to as umami. When added in small amounts, MSG can intensify and balance flavors, giving a more robust and satisfying taste to the condiments. However, it's worth noting that some individuals may be sensitive to MSG or prefer to avoid it for personal reasons. Manufacturers typically adhere to regulatory guidelines and labeling requirements when using MSG as an ingredient.