Potassium polyaspartate

E number E456INS 456CAS 64723-18-8

Used as a stabilizer.

Potassium polyaspartate is a wine stabiliser that prevents tartrate crystals by interfering with how they grow, replacing the older method of chilling the wine for days.

Where it is and isn’t permitted

Status of Potassium polyaspartate by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationNot listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.
Codex AlimentariusCodex Alimentarius Commission / JECFAPermitted, with conditions

1 food category

highest permitted level 100 mg/kg

CXS 192-1995 Table One, INS 456, food category 14.2.3retrieved 2026-09-07

What it is made from

Produced by polymerising aspartic acid and neutralising with potassium.

  • Vegan
  • Vegetarian
CAS registry number
64723-18-8

Every name it appears under

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

E number

  • E456

INS number

  • 456

CAS registry number

  • 64723-18-8

Other names

  • E 456
  • POTASSIUM POLYASPARTATE

Systematic names

  • Dipotassium;(2S)-2-aminobutanedioate

Hazard reference values

No reference value for this substance in the sources we hold.

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

  • 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/potassium-polyaspartate.json