Monosodium glutamate (MSG) is a food additive that is used to enhance the flavor of various dishes, including processed meat and seafood products. It is the sodium salt of glutamic acid, an amino acid naturally present in many foods. MSG works as a flavor enhancer by stimulating the umami taste receptors on the tongue, which contributes to a savory, meaty, or "umami" flavor perception. When added to processed meat and seafood, MSG can help intensify and round out the overall taste, making the product more flavorful and appealing. It is important to note that while MSG is generally recognized as safe by regulatory bodies, some individuals may be sensitive to it and experience symptoms like headaches or flushing.