Does disodium inosinate cause gout?

These additives are purines, and in humans purines break down to uric acid — the substance involved in gout. In the human studies reviewed by the WHO's expert committee (JECFA), serum and urinary uric acid rose significantly only at doses of 2,000 mg and 4,000 mg a day of a 50:50 inosinate–guanylate mixture, which is far above the amount used as a flavour enhancer. JECFA also noted that naturally occurring nucleotides in an ordinary diet greatly exceed the amount from these additives. If you have gout, hyperuricaemia or reduced kidney function, it is still worth knowing which of your regular snacks contain them.

Which foods contain E627 and E631?

Savoury processed foods: instant noodles and their seasoning sachets, potato crisps and extruded snacks, namkeen and Indian savoury mixes, seasoning cubes and powders, soups, sauces, ready meals and some processed meats. On Indian labels they appear as INS 631, INS 627 or INS 635 under the class name 'flavour enhancer'.

That is a certification question rather than a food-safety one, and it turns on the same missing information: the source. Where E631 is made by microbial fermentation or from fish it is generally accepted by halal certifiers; where it is derived from non-halal meat it is not. No regulator requires the source to be printed on the ingredients list, so the only reliable signal is a certification mark on the pack or a direct answer from the manufacturer.

Home › Ingredients › Disodium inosinate (E631) & guanylate (E627)

Is disodium inosinate (E631) safe?

Q: Is disodium inosinate the same as MSG?

No. MSG (E621) is a glutamate; disodium inosinate (E631) and disodium guanylate (E627) are nucleotides. They are usually used together because nucleotides multiply the savoury effect of glutamate, so a manufacturer can use less MSG for the same taste. If you see E631 or E627 on a label, a glutamate source is almost always present too.

By LabelCop · Last updated 13 September 2026 · Sources: EFSA, FDA, FSSAI, WHO/JECFA

The short answer: every major regulator permits it — the unresolved question isn't safety, it's what it was made from.

WHO/JECFA: daily limit "not specified" — the safest category an additive can be given
US, EU, India: all permitted as flavour enhancers; the EU re-evaluation is still open
The gap: E631 can come from fish, meat or fermentation — and no ingredients list tells you which
LabelCop: a medium-tier flag — a purine note for gout, and a source note for anyone eating vegetarian

What are E631, E627 and E635?

Nucleotide flavour enhancers — they make savoury food taste deeper and meatier
E631 disodium inosinate · E627 disodium guanylate · E635 disodium 5'-ribonucleotides (a 50:50 blend of the two)
Label names in India: INS 631, INS 627, INS 635, usually after the class name "flavour enhancer"
They are almost never used alone — they multiply the effect of glutamate, so a manufacturer can use less MSG for the same taste
Sources vary by manufacturer: fish (sardine, bonito), meat, or microbial fermentation

Which foods contain them?

Instant noodles and their seasoning sachets
Potato crisps, extruded snacks and flavoured corn puffs
Seasoning cubes, soup powders, gravy mixes and sauces
Ready meals, savoury biscuits and some processed meats

In India: extremely common across namkeen, masala snack mixes and instant noodle sachets — INS 631 and INS 627 usually sit right next to INS 621 (MSG) in the same bracket

What the regulators actually say

Regulator	Status	Reasoning
WHO / JECFA	ADI "not specified"	The joint FAO/WHO expert committee reviewed inosinate and guanylate together and concluded the combined daily intake "is not of toxicological significance", re-confirming the acceptable daily intake of "not specified". It found no evidence of carcinogenicity, teratogenicity or reproductive harm. It also withdrew its earlier recommendation that foods containing them be labelled on safety grounds.
FDA (United States)	Permitted	Disodium inosinate is listed in the FDA's Substances Added to Food inventory as a flavour enhancer, regulated under 21 CFR 170.60 and 172.535. No numerical daily limit is set.
EFSA / European Union	Permitted; re-evaluation ongoing	Authorised across the EU. The current authorisation rests on a 1990 assessment by the Scientific Committee on Food, which set a group ADI of "not specified". EFSA is re-evaluating the whole ribonucleotide group (E 626–635) under Regulation (EU) No 257/2010; its call for data closed in March 2024 and no new opinion has been published yet.
FSSAI (India)	Permitted within limits	Permitted as flavour enhancers for specified food categories with category-specific maximum levels under the Food Safety and Standards (Food Products Standards and Food Additives) Regulations. Separately, the Labelling and Display Regulations 2020 require the green or brown veg/non-veg symbol wherever any ingredient is of animal origin.
UK, Canada, Australia	Permitted	All permit the ribonucleotide group as flavour enhancers, with no numerical daily limit.

The real disagreement isn't between regulators — it's between the safety file and the label

On toxicology, there is no fight. Every named regulator above permits these additives and none has set a numerical daily limit
On disclosure, there is. E631 is commonly produced from fish or meat, and no regulator requires the source to appear in the ingredients list
India went furthest: in Ram Gaua Raksha Dal v Union of India (9 December 2021) the Delhi High Court singled out E631 by name, noting it is commercially prepared from meat or fish and that businesses often do not disclose this — and directed food businesses to comply with veg/non-veg disclosure rules
What that means in a shop: the INS number tells you nothing about the source; the green or brown symbol on the pack is the only on-label signal, and it describes the whole product
This is the kind of thing a database lookup misses and reading the actual printed pack catches

The purine question, in proportion

These are purines. In humans, purines break down to uric acid — humans lack the enzyme that converts uric acid to allantoin, so uric acid is the end point
What the human data showed: in the studies JECFA reviewed, serum and urinary uric acid rose significantly only at 2,000 mg and 4,000 mg a day of a 50:50 inosinate–guanylate mixture; at 1,000 mg a day and below there was no significant increase
For scale: JECFA estimated intake from flavour-enhancer use at roughly 4 mg per person per day, against up to about 2 g a day of naturally occurring nucleotides from ordinary food
So: the doses that moved uric acid are far above what a flavour enhancer contributes
Still worth knowing if you have gout, high uric acid or reduced kidney function and savoury snacks are a daily habit — that is a conversation for your doctor, not a label

How LabelCop scores it

E627, E631 and E635 are medium-tier flags in LabelCop
Why: they are purines that break down to uric acid — the amount from the additive is small, but it is worth knowing if you have gout or high uric acid, especially in savoury snacks eaten often
We also surface the source-unknown note, because the ingredients list cannot tell you whether it came from fish, meat or fermentation
Their presence is also a reliable signal that you are holding a heavily seasoned processed food — you see the flag, the reason and the sources. No black box

Frequently asked questions

Is disodium inosinate (INS 631) vegetarian?

It depends on the source, and the ingredients list does not tell you. It can be made from fish such as sardine or bonito, from meat, or by microbial fermentation. In India the green or brown symbol required by the Labelling and Display Regulations 2020 is the on-pack signal, and it describes the whole product. The Delhi High Court pointed to E631 by name in 2021 when directing businesses to disclose non-vegetarian ingredients.

Is it the same as MSG?

No. MSG (E621) is a glutamate; E631 and E627 are nucleotides. They are used together because nucleotides multiply the savoury effect of glutamate, letting a manufacturer use less MSG for the same taste. Spotting E631 on a label is a strong hint that a glutamate source is in there too.

Does it cause gout?

These additives are purines and purines break down to uric acid. In the human studies JECFA reviewed, uric acid rose significantly only at 2,000–4,000 mg a day of a 50:50 mixture — far above flavour-enhancer levels, and JECFA noted that ordinary food contributes far more nucleotides than the additive does. If you already have gout or high uric acid, it is still reasonable to know which regular snacks contain it.

Is E631 halal?

That is a certification question, not a safety one, and it turns on the same missing information. Fermentation-derived and fish-derived material is generally accepted; material from non-halal meat is not. No regulator requires the source on the ingredients list, so a certification mark on the pack or a direct answer from the manufacturer is the only reliable route.

How do I avoid it?

Look for INS 631, INS 627, INS 635, disodium inosinate, disodium guanylate or disodium 5'-ribonucleotides in the ingredients list — most often in instant noodles, crisps and seasoning mixes. Or scan the label with LabelCop and it is flagged automatically, with the reasoning shown.

The source isn't on the label. The additive is.

LabelCop reads any food label you photograph — including local snack brands no barcode database has ever seen — and flags additives like E631 instantly.

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Sources

WHO/JECFA: Disodium 5'-guanylate and disodium 5'-inosinate (WHO Food Additives Series 32) · FDA: Substances Added to Food — disodium inosinate · 21 CFR 172.535 — flavouring agents and related substances · EFSA: call for data for the re-evaluation of ribonucleotides (E 626–635) · European Commission: re-evaluation of authorised food additives · FSSAI: Food Safety and Standards regulations — permitted additives · FSSAI: Labelling and Display Regulations 2020 · Delhi High Court: Ram Gaua Raksha Dal v Union of India (9 December 2021)

Related ingredients: MSG (E621) · Natural flavours · Soy lecithin (E322)

This article explains regulatory status and published scientific assessments in plain English. It is not medical advice.