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Doubtful — depends on source
E635 (Disodium 5'-ribonucleotides) is a blend of disodium guanylate (E627) and disodium inosinate (E631) whose sources can be microbial, fish or meat — so it is treated as doubtful (mushbooh) unless the source is known.
Disodium 5'-ribonucleotides is a very common flavour enhancer — a blend of E627 and E631 — used with MSG (E621) to boost savoury taste in snacks and instant foods. Like its components, it can be microbial, fish- or meat-derived.
Made by combining disodium guanylate and disodium inosinate, which can be produced by fermentation or derived from fish/meat. The source is almost never stated.
E635 is doubtful because it inherits the source questions of E627 and E631 — microbial versions are permissible, fish- or meat-derived versions depend on the source (and fish matters to those avoiding it). Because it very commonly appears alongside E621 in snacks and its source is unstated, the honest default is to verify.
It may be found in — this does not mean every product below contains it.
Disodium 5'-ribonucleotidesE635Flavour enhancer (E635)INS number: 635
In Singapore, verify the finished product on the MUIS HalalSG register or contact the manufacturer, since the source of E635 is usually not printed.
Check MUIS HalalSGSources: FAO/WHO, MUIS · Last reviewed: July 2026 · This guidance is not certification.
It is doubtful (mushbooh). It is a blend of E627 and E631, whose sources can be microbial, fish or meat and are usually unstated — verify with certification or the manufacturer.
Its components can be derived from meat (possibly including pork sources), but may also be microbial or fish. Confirm via certification or the manufacturer.
'Disodium 5'-ribonucleotides', 'E635' — usually listed with E621.
Humble Halal methodology: we classify additives by their common origin, not by any specific product. A generally-halal ingredient does not make a finished product halal-certified. This page is general guidance, not certification or religious/legal advice — always verify the complete product. Last reviewed July 2026.