YenzoWhat is E633 (calcium inosinate)?
Appendix 1 of Circular 24/2019/TT-BYT lists the function of Calcium inosinate (INS 633) as: flavour enhancer.
E633Calcium inosinate
E633 is Calcium inosinate. Appendix 1 of Circular 24/2019/TT-BYT lists its function as flavour enhancer.
- Code
- E633 · INS 633
- Group
- Flavour enhancer
In Vietnam✓ PermittedOn the list of permitted additives — Circular 24/2019, Appendix 1
Risk level on the Yenzo Scalelow?Based on the Open Food Facts additives taxonomy
How E633 appears on labels
IngredientsIllustrative example
Wheat flour, vegetable oil, salt, sugar, flavour enhancer (633), dried onion and garlic, pepper, natural colour (160a).
flavour enhancer (633)flavour enhancer 633E633INS 633On Vietnamese labels: Calci 5'-inosinat
Calcium inosinate in food
Salt substitutes
Questions about calcium inosinate
Is calcium inosinate harmful?
JECFA (1985) listed the group ADI for inosinic acid and its calcium, dipotassium and disodium salts as "not specified", meaning no numerical ADI was needed.
Is E633 permitted in Vietnam?
Yes. Calcium inosinate (INS 633) is listed in Appendix 1 of Circular 24/2019/TT-BYT, the list of additives permitted in food.
Other flavour enhancers
E629Calcium guanylatelowE630Inosinic acidlowE631Disodium inosinatelowE632Dipotassium inosinatelowE634Calcium 5'-ribonucleotideslowE635Disodium 5'-ribonucleotideslow
See all flavour enhancers →Updated 23 October 2026
Sources (3)
- Open Food Facts additives taxonomy (Yenzo's table cites no EFSA opinion for this code). Open Food Facts additives taxonomy, https://github.com/openfoodfacts/openfoodfacts-server/blob/main/taxonomies/additives.txt (entry en:e633)
- Thông tư 24/2019/TT-BYT (văn bản hợp nhất 09/VBHN-BYT), Phụ lục 2A
- JECFA database (WHO): Calcium 5'-inosinate, INS 633, evaluation 1985