Adding on, glutamic acid is widely found in meats, and in certain other foods such as seaweed, kelp, and yeast. (Yeast extract may appear in some ingredient lists as a sneaky way of adding glutamates without listing MSG.) Your body needs and wants this.

Meanwhile, the sodium part of MSG might cause some concerns if you have a restrictive diet. MSG is just one of many, many sodium sources that aren't table salt.