Although the Food and Drug Administration (FDA) has classified MSG as a food ingredient that's "generally recognized as safe," the use of MSG remains very controversial. For this reason, when MSG is added to food, the FDA requires that it be listed on the label.
How do you spot MSG on food labels? It goes under the food additive code E621. You also need to look out for the following ingredients on products as these ALWAYS contain MSG:
Glutamate, Monosodium glutamate, Monopotassium glutamate, Glutamic acid, Calcium caseinate, Gelatin, Textured protein, Hydrolyzed protein (any protein that is hydrolyzed), Yeast extract, Yeast food, Autolyzed yeast, Yeast nutrient.
When you have Chinese food, make sure you ask if MSG is added to your food and request that they remove it.