MSG gets a bad press. Not entirely sure why, as the stories about it are largely unproven.
No uncommonly you will see products claiming 'no MSG'.
Or restaurants with the same sign. No MSG.
They are misleading you folks. What they mean is 'No Added MSG'.
You see, for all its bad press, MSG is naturally occurring in most foods, especially the following:
Cheeses, especially hard cheeses like parmesan
Tomatoes and tomato juices, concentrates and sauces
Stocks cubes and concentrates
Sauces such as soy, fish, oyster etc
Spreads such as Vegemite®, Promite®, Marmite® etc.
Foods containing added Hydrolyzed Vegetable Protein (HVP)
And Human breast milk.
Glutamate is produced by the human body and is vital for metabolism and brain function.