I still have not seen E623 / calcium glutamate on US labels. (That does not mean the ingredient is not there, because of US labelling rules.)

Years ago, I used to see MSG (mono sodium glutamate) on labels. Currently, a lot of US foods advertise "No MSG"

https://loadaverage.org/notice/19474400

When using foods without "flavor enhancers" added, you will have to add various herbs and spices to make up for it. Also, stick with the "No E623" version. After a while, people's tastes will adjust and the chemically enhanced versions will not taste right.