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Flavour enhancer

E628 (dipotassium guanylate): what it is, its sources, vegan or not

E628 can come from yeast, fermentation or fish, and the pack rarely says which. Vegetarian and vegan profiles get Heads up: source not stated.

By Bravoora teamUpdated 13 October 2026Sources checked 20 September 20264 sourcesHow we check

Heads up

for a vegan profile

E628=source not stated

What is E628?

E628 (dipotassium guanylate) is a flavour enhancer, an additive that brings out the taste or smell a food already has.

What is E628 made from?

E628 can come from yeast, fermentation or fish. The source is not stated on the pack: a label does not have to say which of these was used.

Yeast
Fermentation
FishDeclared allergen

Is E628 vegan?

Heads up. Source not stated. E628 can come from yeast, fermentation or fish. The pack does not have to say which, so the app says Heads up instead of guessing.

What the app says to each profile, and the reason it shows.

VeganHeads upSource not stated. E628 can come from yeast, fermentation or fish. The pack does not have to say which, so the app says Heads up instead of guessing.

VegetarianHeads upSource not stated. E628 can come from yeast, fermentation or fish. One of those is meat, fish or a slaughter by-product, and the pack does not have to say which.

Fish allergyHeads upIt can come from fish. In the EU, UK, US and Gulf a label must name fish when that is the source, so read the Contains line.

What other names does E628 have on a label?

On a label, E628 can also appear as “INS 628”, “Flavour enhancer (628)”, “Flavour enhancer (E628)”, “Dipotassium guanylate” or “Potassium guanylate”.

Any of these on a pack means E628. The checker reads them all.

E628E 628E-628INS 628Flavour enhancer (628)Flavour enhancer (E628)Dipotassium guanylatePotassium guanylate

What would change the answer for E628?

For E628, a stated source changes the answer. A pack that says “from fermentation” gives Fits you; one that says “from fish” gives Not for you. A list that is cut off or unreadable gets Needs one more scan.