It’s repeated over and over and over again in glutamate-industry propaganda: “backed by science.” The current meaningless feel-good phrase designed to con you into thinking monosodium glutamate is good for you.
The only science that the Glutes use is rigged to guarantee to conclude that MSG is both “safe” and a good thing to eat. Rigged? Yes, “rigged.” The details are spelled out for you in a little post called “designed for deception.” But if you don’t care to read all the details, just remember that the placebos they have been using in their double-blind studies since 1978 all produce the same reactions that are caused by MSG, and it’s on that basis they make their claim that MSG is harmless.