Depends on the source
- Usually made from
- Fermentation, or meat and fish
- Used as
- flavour enhancer
- Vegan
- Depends on the source
Often made by fermentation, but it can come from meat or fish.
What is E635?
A roughly equal mix of disodium inosinate (E631) and disodium guanylate (E627), often called I+G in the food industry. Both parts are made mainly by fermentation with bacteria or by breaking down yeast RNA, but they can also be obtained from animal sources.
Why it's marked “Depends on the source”
It shares the question marks of both parts. Fermentation and yeast versions are fine, but inosinate in particular occurs naturally in meat and fish, and the label does not show which route was used. Meat from non-halal animals would be the concern; fish matters mainly to vegetarians.
How to check the label
Look for a halal certificate from a recognised body, or a vegetarian or vegan mark, which rules out meat sources. You can also ask the manufacturer whether the flavour enhancers are made by fermentation.
Where you'll find it
- instant noodles
- crisps and snacks
- stock cubes
- soups and sauces
- seasoning mixes
Good to know
- EU specifications require each of the two parts, inosinate and guanylate, to make up between 47% and 53% of the mix.
- Used at very low levels alongside MSG to boost savoury taste.
- EFSA collected data in 2023 and 2024 to re-evaluate all ribonucleotide additives, E626 to E635, under the EU re-evaluation programme.
Similar additives
See all 89 E-numbers in the halal checker
This list describes where additives usually come from. It isn't a religious ruling, and manufacturers can change their sources. Last reviewed: 14 October 2026.
Sources
- EU additive specifications, Regulation (EU) No 231/2012 (E 635)
- EFSA call for data to re-evaluate ribonucleotides E 626-635
Frequently asked questions
Is E635 halal?
Depends on the source. It shares the question marks of both parts. Fermentation and yeast versions are fine, but inosinate in particular occurs naturally in meat and fish, and the label does not show which route was used. Meat from non-halal animals would be the concern; fish matters mainly to vegetarians.
What is E635 made from?
A roughly equal mix of disodium inosinate (E631) and disodium guanylate (E627), often called I+G in the food industry. Both parts are made mainly by fermentation with bacteria or by breaking down yeast RNA, but they can also be obtained from animal sources.
Is E635 vegan?
It depends on the source. E635 can be made from plant or animal material, so look for a vegan or vegetarian label.