Magnesium Carbonate Hydroxide
Magnesium carbonate is GRAS for use in food and is also an over-the-counter antacid and magnesium supplement. EFSA reaffirmed the safety of magnesium carbonate (E 504) without numerical ADI.
What it is
A basic magnesium carbonate (a hydrated magnesium hydroxide carbonate compound), white odorless powder; INS/E-number 504(i)/(ii) family.
Anticaking agent, color retention aid, antacid, and source of magnesium fortification.
Why it's flagged
- laxative effect at high doses
- caution in severe renal impairment
What regulators actually say
"Magnesium carbonate (CAS Reg. No. 39409-82-0) is a colorless monoclinic crystal or white odorless powder... Generally recognized as safe."
"The Panel concluded that there is no safety concern for the use of magnesium carbonates (E 504(i) and (ii)) at the reported uses and use levels."
Regulatory status
United States — FDA
Magnesium carbonate is GRAS under 21 CFR 184.1425 for use as a multipurpose food substance.
European Union — EFSA
Approved as E 504; EFSA 2018 re-evaluation found no safety concern at reported uses.
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