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Flavour enhancer

E635 (disodium ribonucleotides): what it is, its sources, vegan or not

E635 can come from fish, meat, yeast or fermentation, 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

E635=source not stated

What is E635?

E635 (disodium ribonucleotides) is a flavour enhancer, an additive that brings out the taste or smell a food already has.

What is E635 made from?

E635 can come from fish, meat, yeast or fermentation. A mix of E627 and E631, so it can come from fish or meat, or from fermentation. Very common on crisps.

FishDeclared allergen
Meat
Yeast
Fermentation

Is E635 vegan?

Heads up. Source not stated. E635 can come from fish, meat, yeast or fermentation. 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. E635 can come from fish, meat, yeast or fermentation. The pack does not have to say which, so the app says Heads up instead of guessing.

VegetarianHeads upSource not stated. E635 can come from fish, meat, yeast or fermentation. 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 E635 have on a label?

On a label, E635 can also appear as “INS 635”, “Flavour enhancer (635)”, “Flavour enhancer (E635)”, “Disodium 5′-ribonucleotides” or “I+G”.

Any of these on a pack means E635. The checker reads them all.

E635E 635E-635INS 635Flavour enhancer (635)Flavour enhancer (E635)Disodium 5′-ribonucleotidesI+G

What would change the answer for E635?

For E635, 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.