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Monosodium glutamate (MSG) is a flavor enhancer that has been used in a wide variety of food products over the years. It is a sodium salt of glutamic acid, an amino acid. Resembling salt or sugar in appearance when it is isolated from a food, MSG does not have a distinctly recognizable taste. It triggers the taste buds newly classified as being sensitive to "umami", a savory taste and loanword borrowed from Japanese.

Chefs, even before giving a name to umami, have been using ingredients with a naturally high glutamate content to enhance the flavor of dishes. It is found in large quantities in ingredients such as tomatoes, mushrooms, corn, parmesan cheese and soy sauce, in addition to occuring in meats, like beef and chicken. It is the perception of MSG as a food additive - rather than as a naturally occurring flavoring - that has given it a bad name.