Naturally brewed Kikkoman soy sauce does not contain any added, isolated monosodium glutamate (MSG). The savory umami flavor that characterizes the product is entirely natural, created organically during the traditional fermentation process as proteins from soybeans and wheat break down into naturally occurring amino acids and glutamates. While some specialized commercial or non-brewed variants of soy sauce across the global market may contain flavor enhancers, authentic Kikkoman relies strictly on natural brewing methods.