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Magnesium Oxide

Also known as: E530, magnesia

Low concern

Magnesium oxide is GRAS at FDA and approved as a food additive in the EU. It serves both as a functional additive and as a magnesium nutrient source.

Found in

3,309 products

E-number

E530

What it is

Magnesium oxide (E530), a white powder produced from magnesium ores.

Anti-caking agent, pH regulator, magnesium source.

Why it's flagged

laxative effect at high supplement doses, not at food-additive levels

What regulators actually say

"Magnesium oxide (Mg(OH)2 chemical formula MgO, CAS Reg. No. 1309-48-4) is generally recognized as safe when used in accordance with good manufacturing practice."

21 CFR 184.1431 - Magnesium oxide — accessdata.fda.gov

Regulatory status

United States — FDA

GRAS (21 CFR 184.1431)

European Union — EFSA

Approved (E530); generally authorized without specified maximum

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