What is Ajinomoto Monosodium Glutamate (MSG)? MSG seasoning, also known as Monosodium Glutamate, is a proven flavor enhancer used in various cuisines worldwide. MSG can enhance the intense flavors of many dishes, and the product has proven particularly effective in Asian cuisine. This popular seasoning ensures that the so-called "umami" notes are intensified, a flavor described as savory or meaty, which naturally occurs in foods like meat, cheese, and mushrooms. Origin and Composition MSG is derived from glutamic acid, an amino acid that naturally occurs in many foods and the human body.