Monosodium glutamate ( MSG ), also known as sodium glutamate, is a sodium salt of glutamic acid. - Message - MSG means Message. MSG is a flavor enhancer made from sodium and glutamic acid, a natural amino acid. It's used in many foods, but some people may have adverse reactions to it. Learn more about MSG , its uses, and its health effects. Message Full Form - What is the full form of Messages? Learn all the details about Message full form , history, safety concerns and examples on Careers360.com