YenzoWhat is E529 (calcium oxide)?
According to Appendix 1 of Circular 24/2019/TT-BYT, calcium oxide (INS 529) has the function acidity regulator and flour treatment agent.
E529Calcium oxide
E529 is calcium oxide. In Appendix 1 of Circular 24/2019/TT-BYT it has the function acidity regulator and flour treatment agent.
- Code
- E529 · INS 529
In Vietnam✓ PermittedOn the list of permitted additives — Circular 24/2019, Appendix 1
Risk level on the Yenzo Scalevery low?Based on the Open Food Facts additives taxonomy
How E529 appears on labels
IngredientsIllustrative example
Wheat flour, vegetable oil, salt, sugar, acidity regulator (529), dried onion and garlic, pepper, natural colour (160a).
acidity regulator (529)acidity regulator 529E529INS 529On Vietnamese labels: Oxyd calci
Questions about calcium oxide
Is calcium oxide harmful?
The FAO/WHO expert committee JECFA last evaluated calcium oxide in 1965 and recorded the ADI as “not limited”. This is a JECFA conclusion, not an EFSA one; the JECFA summary gives no intake figures.
Is E529 permitted in Vietnam?
Yes. Calcium oxide (INS 529) is listed in Appendix 1 of Circular 24/2019/TT-BYT, the list of additives permitted in food.
Other acidity regulators
E524Sodium hydroxidevery lowE525Potassium hydroxidevery lowE526Calcium hydroxidevery lowE527Ammonium hydroxidevery lowE528Magnesium hydroxidevery lowE530Magnesium oxidevery low
See all acidity regulators →Updated 21 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:e529)
- Thông tư 24/2019/TT-BYT (văn bản hợp nhất 09/VBHN-BYT), Phụ lục 1
- JECFA (FAO/WHO), Summary of Evaluations: Calcium oxide (INS 529)