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Flavour enhancer

E633 (calcium inosinate): what it is, its sources, vegan or not

Q: What is E633 made from?

E633 can come from fish, meat or fermentation. The source is not stated on the pack: a label does not have to say which of these was used.

Q: What other names does E633 have on a label?

On a label, E633 can also appear as “INS 633”, “Flavour enhancer (633)”, “Flavour enhancer (E633)” or “Calcium inosinate”. Any of these on a pack means E633. The checker reads them all.

E633 can come from fish, meat or fermentation, and the pack rarely says which. Vegetarian and vegan profiles get Heads up: source not stated.

Decode another E-number Which E-numbers come from animals?Add vegan to my profile

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

Heads up

for a vegan profile

E633=source not stated

What is E633?

E633 (calcium inosinate) is a flavour enhancer, an additive that brings out the taste or smell a food already has.

What is E633 made from?

The source is not stated on the pack: a label does not have to say which of these was used.

FishDeclared allergen
Meat
Fermentation

Is E633 vegan?

Heads up. Source not stated. E633 can come from fish, meat or fermentation. The pack does not have to say which, so the app says Heads up instead of guessing.

Bravoora is a calorie tracker and ingredient checker app. Scan a pack, a supplement or a skincare label and it answers for each person on your plan.

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

VeganHeads upSource not stated. E633 can come from fish, meat or fermentation. The pack does not have to say which, so the app says Heads up instead of guessing.

VegetarianHeads upSource not stated. E633 can come from fish, meat or fermentation. One of those comes from a slaughtered animal, 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 E633 have on a label?

Any of these on a pack means E633. The checker reads them all.

E633E 633E-633INS 633Flavour enhancer (633)Flavour enhancer (E633)Calcium inosinate

What would change the answer for E633?

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.