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Flavour enhancer

E634 (calcium 5′-ribonucleotides): what it is, its sources, vegan or not

E634 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

E634=source not stated

What is E634?

E634 (calcium 5′-ribonucleotides) is a flavour enhancer, an additive that brings out the taste or smell a food already has.

What is E634 made from?

E634 can come from fish, meat, yeast or fermentation. A mix of E629 and E633, so it can come from fish or meat, or from fermentation.

FishDeclared allergen
Meat
Yeast
Fermentation

Is E634 vegan?

Heads up. Source not stated. E634 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. E634 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. E634 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 E634 have on a label?

On a label, E634 can also appear as “INS 634”, “Flavour enhancer (634)”, “Flavour enhancer (E634)”, “Calcium 5′-ribonucleotides” or “Calcium ribonucleotides”.

Any of these on a pack means E634. The checker reads them all.

E634E 634E-634INS 634Flavour enhancer (634)Flavour enhancer (E634)Calcium 5′-ribonucleotidesCalcium ribonucleotides

What would change the answer for E634?

For E634, 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.