PBS’s Mind of a Chef letting you know what’s actually up with MSG. Turns out, not only is MSG completely natural, but it’s not bad for you (unless you eat tons of it, but that goes for anything.)
MSG is one of the most common naturally occurring non-essential amino acids (meaning your body doesn’t or can’t make it on its own). It’s found in everything from tomatoes to aged steaks, and is one of the main components of the umami in Japanese cooking, so it’s also a large part of what makes things like soy sauce and miso taste so good.
So, MSG is perfectly fine to eat and makes a lot of foods taste better and some food wouldn’t taste the way it does without it, but everything in moderation! Don’t go dumping it onto your food, it’s a seasoning and flavor enhancer on its own much the same way that salt is.