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E621Flavor enhancerLow concern
Monosodium Glutamate
In plain words
The short version
A sodium salt of glutamic acid used to deepen savory (umami) flavor in foods.
Why it's green
A flavour enhancer that adds a savoury 'umami' taste. Most people tolerate it fine and the old 'Chinese-restaurant syndrome' scare was never confirmed, but a minority report short-lived headaches or flushing after large amounts. That's why we flag it mildly.
Safety profile
No ADI specified by JECFA. The 'Chinese Restaurant Syndrome' reported in the 1960s has not been confirmed in controlled double-blind studies. Glutamate is the most abundant amino acid in the human diet and an essential neurotransmitter. Rare individuals report sensitivity at high doses.
The detail
Educational information only. Not medical or dietary advice.