Go ahead and do that sparky, I'll wait (hint: if the website is some vegan hippy dippy shit, it's probably not reliable). In the meantime, here are 5 more sources that back up the "MSG is recognized as safe" argument (unless you consume 3g/kgBW like they used in the "studies" showing any danger at all)
Questions and Answers on Monosodium glutamate (MSG)
www.fda.gov
Monosodium glutamate is blamed for a range of nasty side effects. But is it really the food fiend that people claim? Bianca Nogrady weighs the evidence
www.bbc.com
MSG (monosodium glutamate) is a common but controversial ingredient in processed foods. This article explains whether it's truly unhealthy.
www.healthline.com
en.wikipedia.org
The effects of MSG are demonstrated by its important role in digestion by increasing salivation, signaling that a meal contains protein.
msgfacts.com
Like everything on earth, including dihydrogen monoxide, to much is likely bad for you. But when the "researchers" need to use a minimum of 1g/kg of body weight to show any negative effects (claims of headache), the substance is probably not going to harm you. Just don't eat 90g (1/2 cup) of the stuff in one sitting.