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The use of MSG may not be as much of a threat as some may proclaim. Like so many other 'issues' i.e. peanut allergy, it may not be a problem for the majority of the population and for those it is, avoidance may be necessary. At times one needs to view 'the sky is falling' websites for what they are and depend more on legitimate research. Ocassionaly even the legitimate researchers may disagree but eventually a consensus is found.

Mayo Clinic March 2018 wrote:
Monosodium glutamate (MSG) is a flavor enhancer commonly added to Chinese food, canned vegetables, soups and processed meats. The Food and Drug Administration (FDA) has classified MSG as a food ingredient that's "generally recognized as safe," but its use remains controversial. For this reason, when MSG is added to food, the FDA requires that it be listed on the label.

MSG has been used as a food additive for decades. Over the years, the FDA has received many anecdotal reports of adverse reactions to foods containing MSG. These reactions — known as MSG symptom complex — include:

Headache
Flushing
Sweating
Facial pressure or tightness
Numbness, tingling or burning in the face, neck and other areas
Rapid, fluttering heartbeats (heart palpitations)
Chest pain
Nausea
Weakness
However, researchers have found no definitive evidence of a link between MSG and these symptoms. Researchers acknowledge, though, that a small percentage of people may have short-term reactions to MSG. Symptoms are usually mild and don't require treatment. The only way to prevent a reaction is to avoid foods containing MSG.