YenzoWhat is E528 (magnesium hydroxide)?
According to Appendix 1 of Circular 24/2019/TT-BYT, magnesium hydroxide (INS 528) has the function acidity regulator and colour retention agent.
E528Magnesium hydroxide
E528 is magnesium hydroxide. In Appendix 1 of Circular 24/2019/TT-BYT it has the function acidity regulator and colour retention agent.
- Code
- E528 · INS 528
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 E528 appears on labels
IngredientsIllustrative example
Wheat flour, vegetable oil, salt, sugar, acidity regulator (528), dried onion and garlic, pepper, natural colour (160a).
acidity regulator (528)acidity regulator 528E528INS 528On Vietnamese labels: Magnesi hydroxyd
Questions about magnesium hydroxide
Is magnesium hydroxide harmful?
The FAO/WHO expert committee JECFA last evaluated magnesium hydroxide 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 E528 permitted in Vietnam?
Yes. Magnesium hydroxide (INS 528) 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 lowE529Calcium oxidevery 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:e528)
- Thông tư 24/2019/TT-BYT (văn bản hợp nhất 09/VBHN-BYT), Phụ lục 1
- JECFA (FAO/WHO), Summary of Evaluations: Magnesium hydroxide (INS 528)