Monoammonium glutamate

INS 624CAS 7558-63-6

Used as a flavour enhancer.

Monoammonium glutamate is a flavour enhancer in the MSG family, delivering the same savoury taste with ammonium rather than sodium.

Where it is and isn’t permitted

Status of Monoammonium glutamate by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationPermitted21 CFR 182.1500retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFAPermitted, with conditions

2 food categories

no numerical limit (good manufacturing practice)

Show every food category
  • 08.1 Fresh meat, poultry, and game — GMP
  • 12.1.2 Salt substitutes — GMP
CXS 192-1995 Table Three, INS 624and 2 further provisionsretrieved 2026-09-07

What it is made from

Made by neutralising glutamic acid, produced by bacterial fermentation of a carbohydrate feedstock, with ammonia.

  • Vegan
  • Vegetarian
CAS registry number
7558-63-6
InChIKey
PHKGGXPMPXXISP-DFWYDOINSA-N
PubChem
CID 24802175

Every name it appears under

24 recorded names. A label may use any of them.

E number

  • E624

INS number

  • 624

CAS registry number

  • 7558-63-6

As it appears in regulation

  • Monoammonium glutamate

Other names

  • (2S)-2-aminopentanedioic acid amine
  • (2S)-2-aminopentanedioic acid;azane
  • (S)-2-Aminopentanedioic acid ammonium salt
  • 245K560GAW
  • Ammonium (S)-2-amino-4-carboxybutanoate
  • AMMONIUM GLUTAMATE
  • Ammonium L-glutamate
  • ammonium;(2S)-2-amino-5-hydroxy-5-oxo-pentanoate
  • Ammoniumglutaminat
  • Glutamic acid, monoammonium salt, L-
  • INS NO.624
  • INS-624
  • L-Glutamic acid (ammonium)
  • L-Glutamic acid ammonium salt
  • L-Glutamic acid, ammonium salt (1:1)
  • L-Glutamic acid, monoammonium salt
  • Monoammonium glutamate
  • Monoammonium L-glutamate
  • PHKGGXPMPXXISP-DFWYDOINSA-N

Systematic names

  • ammonium (2S)-2-amino-4-carboxybutanoate

Hazard reference values

Values set by assessing bodies. A body that has not set a value is not listed here.
TypeValuePopulationAssessed byOpinion
ADI30 mg/kg bw/dayconsumersEFSAnot identified in the dataset

Evidence and how bodies read it

Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.

Sources for this page

  • ecfr retrieved 2026-09-07
  • gsfa retrieved 2026-09-07

Full licence terms and publisher details on Sources. How this page is built and updated: Method.

Machine-readable:/api/v1/additives/monoammonium-glutamate.json