E528: Magnesium Hydroxide
Main role: acidity control
Also listed as: Mg(OH)2
What is E528 (Magnesium Hydroxide)?
Magnesium hydroxide is an alkaline magnesium compound used in specified food applications. Its processing role is separate from medicinal products that may use the same chemical under different dosage instructions.
What does it do in food?
Its main role is acidity control. Mineral ingredients can adjust acidity, firm a food, or keep powders flowing. A technical mineral ingredient does not establish a nutritional dose; use the nutrition declaration to assess amounts per serving.
Food and formulation examples
- Acidity-control blends
- Ingredient processing
- Specified food preparations
These examples describe formulation roles, not a list of unrestricted legal uses. Availability and permitted applications differ by country and food category.
Label names and ingredient questions
Look for E528, E 528, or the ingredient name. Related names and label terms include Mg(OH)2. A family code can cover more than one specified form; check the full declaration when the distinction matters.
Do not infer a laxative medicine dose from an E528 declaration. Ingredient amount, intended use, and the product's instructions are different information.
Is E528 safe?
There is no meaningful personal risk estimate from an E number alone. Food-grade specifications, allowed uses, amount consumed, and individual circumstances all matter. The authorization record below gives the legal scope; it is not a claim that every possible use is appropriate.
A label identifies the ingredient but usually not its concentration. Calculating daily intake requires the amount in the food and the quantities eaten.
Authorization and conditions of use
The Great Britain food additive register lists E528 as Magnesium hydroxide. This is an entry subject to its stated conditions, not unrestricted permission for every food. The record links to the applicable authorization terms. For an EU product, use the European Commission food additive database to check the relevant food category and limits. Other countries may use different names or rules.