Look for the "best before" date on the label of Monosodium Glutamate.
Overconsumption of Monosodium Glutamate may cause headache, sweating, chest pain, nausea, weakness and numbness.(1)
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Monosodium Glutamate is a sodium salt of glutamic acid which is a naturally occurring non-essential amino acid. It is considered as a food additive to enhance the flavour of food and is denoted with E number E621.