What is E633?

Calcium inosinate is a calcium salt of the nucleoside inosine. Under the E number E633, it is a food additive used as a flavor enhancer. E633 sits in the E600–E699 series, which in the EU classification mainly covers flavour enhancers.

What is E633 used for?

E633 belongs to the flavour enhancers group. Flavour enhancers such as monosodium glutamate (E621) bring out taste. They are approved, though some prefer to limit them.

Is E633 safe?

E633 is rated “moderate”. It is approved for use in food, but some people prefer to limit it. “Moderate” means it is approved, but is debated or something some people prefer to limit.

How E633 appears on labels

On food packaging you'll find E633 either as the number “E633” or by the name “Calcium inosinate” in the ingredient list, often after its function. Ingredients are listed in descending order by weight, so an additive near the end is present only in small amounts.

Is E633 vegan?

No, E633 is animal-derived and not suitable for vegans.