Digestoa
Additive · Flavour enhancer

Monosodium glutamate (MSG) (E621)

Monosodium glutamate (MSG) (E621) is a flavour enhancer that Digestoa flags as moderate risk. Common concerns include headaches in sensitive individuals.

Digestoa riskModerate risk
TypeFlavour enhancer
Found inInstant noodles, crisps, stock cubes, savoury snacks, ready meals and many fast foods.
ConcernsHeadaches in sensitive individuals · Marker of ultra-processing

What is Monosodium glutamate (MSG)?

Monosodium glutamate (MSG) is a flavour enhancer that adds savoury 'umami' taste. It's also a reliable marker that a food is ultra-processed.

Is Monosodium glutamate (MSG) bad for you?

Digestoa flags Monosodium glutamate (MSG) as moderate risk. Regulators permit it, but safety reviews and studies have raised concerns including headaches in sensitive individuals, marker of ultra-processing. How often you eat it matters more than a single exposure.

What foods contain Monosodium glutamate (MSG)?

Instant noodles, crisps, stock cubes, savoury snacks, ready meals and many fast foods..

Digestoa's take

You don't need to panic over a single product that contains Monosodium glutamate (MSG). But it's a useful flag: when you see E621 on a label it often signals a more processed product, and there's usually a cleaner alternative.

Safer swaps

Season with herbs, spices, or naturally umami foods like mushrooms, tomatoes and parmesan.

Frequently asked questions

Is E621 the same as Monosodium glutamate (MSG)?
Yes — E621 is the international additive (E-number) code for Monosodium glutamate (MSG).
Is Monosodium glutamate (MSG) bad for you?
Digestoa flags Monosodium glutamate (MSG) (E621) as moderate risk. It's permitted in food, but it's associated with concerns such as headaches in sensitive individuals.
What are the side effects of Monosodium glutamate (MSG)?
Reported concerns include: Headaches in sensitive individuals; Marker of ultra-processing.
What foods contain Monosodium glutamate (MSG)?
Instant noodles, crisps, stock cubes, savoury snacks, ready meals and many fast foods..
How can I avoid Monosodium glutamate (MSG)?
Check the ingredients list for "Monosodium glutamate (MSG)" or "E621", or scan the product with Digestoa to see if it's present before you buy.

Related flavour enhancer additives

Glutamic acid (E620)Disodium guanylate (E627)Disodium inosinate (E631)Disodium 5-ribonucleotides (E635)

Risk ratings reflect Digestoa's editorial assessment synthesising EFSA/IARC opinions and peer-reviewed research. Informational only — not medical advice.