What is E626?

Guanosine monophosphate (GMP), also known as 5′-guanidylic acid or guanylic acid, is a nucleotide that is used as a monomer in RNA. It is an ester of phosphoric acid with the nucleoside guanosine. E626 sits in the E600–E699 series, which in the EU classification mainly covers flavour enhancers.

What is E626 used for?

E626 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 E626 safe?

E626 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 E626 appears on labels

On food packaging you'll find E626 either as the number “E626” or by the name “Guanylic acid” 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 E626 vegan?

No, E626 is animal-derived and not suitable for vegans.