Mayo Clinic reports that a small percentage of people may experience minor adverse reactions to foods with monosodium glutamate, but researchers have found no definitive evidence of MSG causing reactions commonly known as MSG symptom complex. Those who do experience symptoms related to MSG intake typically do not require treatment.
As of 2014, the U.S. FDA classifies MSG as generally safe, according to Mayo Clinic. However, producers are required to list MSG as an ingredient on food labels when it is added. Over numerous years, the FDA has received complaints of adverse reactions to MSG, known as MSG symptom complex. These reactions include headache, flushing, sweating, facial pressure or tightness, numbness, tingling or burning in the face, neck and other areas, rapid heartbeat, chest pain, nausea, and weakness.