Is it vegan? Additives & E-numbers E631
Is E631 vegan?
Quick answer: It depends. Disodium inosinate (E631) can be made from meat or fish, or by fermentation; the label does not say which.
Also called: E631, disodium 5′-inosinate, IMP, disodium 5′-ribonucleotides (E635)
The details
Disodium inosinate is a flavour enhancer usually used together with MSG. The Vegetarian Resource Group describes it as a flavour enhancer that “may be non-vegetarian”, because it has historically been produced from meat or fish (including sardines) as well as by microbial fermentation.
The related additive E635 (disodium ribonucleotides) is a mix of E627 and E631 and has the same uncertainty. Products with a vegan logo use non-animal sources.
What to look for on the label
- E631
- disodium inosinate
- E635 (disodium 5′-ribonucleotides)
Where it’s found
- Crisps and savoury snacks
- Instant noodles and soups
- Seasonings
Vegan alternatives
- Products with a vegan logo
- Snacks flavoured with yeast extract or MSG only
Frequently asked questions
Is E631 vegan?
It depends. Disodium inosinate (E631) can be made from meat or fish, or by fermentation; the label does not say which.
Sources
- Approved additives and E numbers — Food Standards Agency (UK)
- Ingredient questions and answers — The Vegetarian Resource Group
Checked on 31 October 2026. Ingredients and recipes change, and the same product can differ between countries — always check the current label. This page is general information, not allergy or medical advice.