Since when is "natural vs artificial" evidence of relative healthiness, or even a logical basis for comparison at all? You have numerous comments in this thread all drawing on the same fallacy that some MSG can be "good" and some can be "bad" when that is inherently impossible.

Producing a URL with the word "science" in it ending in .org is not sufficient evidence. Find a single empirical datapoint or published study, otherwise stop spreading fearmongering speculation. Do you concern yourself with which table salt to buy because it may be "bad NaCl"?

Surely the flavour enhancing one must be the natural one, or else meat wouldn't have the umami taste, or am I missing something?