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E634Flavor enhancerLow concern
Calcium 5'-Ribonucleotides
In plain words
The short version
A 1:1 calcium mixture of GMP and IMP — sodium-free analog of disodium 5'-ribonucleotides (E635).
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
ADI not specified (combined nucleotides).
The detail
A 1:1 mixture of calcium inosinate (E633) and calcium guanylate (E629), produced from yeast-RNA hydrolysis. The mixed nucleotide blend matches the umami profile of the more common disodium version (E635).
The sodium-free analog of E635 — used in sodium-restricted savory blends and some infant cereals. Combined IMP + GMP synergize with glutamate even more strongly than either nucleotide alone, allowing lower total flavor-enhancer load.
White powder, sparingly soluble in water.
Permitted globally with maximum-use limits per category.
Sources
- WHO JECFA database: Calcium 5'-ribonucleotides (INS 634), 18th meeting evaluation (1974) — WHO / Joint FAO/WHO Expert Committee on Food Additives, 1974. Mixture of calcium IMP and GMP; ADI not specified
- Commission Regulation (EU) No 1129/2011: Union list of food additives (Annex II to Reg. 1333/2008), as adopted — European Union (text via legislation.gov.uk, The National Archives), 2011. EU authorisation within the E 626-635 ribonucleotides group, with maximum levels
Checked against these sources on .
Educational information only. Not medical, dietary or veterinary advice. Spotted an error? Tell us.