Cuprous iodide

CAS 7681-65-4

Cuprous iodide is used to iodise salt, supplying iodine in a form that resists loss during storage.

Where it is and isn’t permitted

Status of Cuprous iodide 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 184.1265retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFANot listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.

What it is made from

Made by reacting a copper salt with an iodide.

  • Vegan
  • Vegetarian
CAS registry number
7681-65-4
InChIKey
LSXDOTMGLUJQCM-UHFFFAOYSA-M
PubChem
CID 6432705

Every name it appears under

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

CAS registry number

  • 7681-65-4

As it appears in regulation

  • Cuprous iodide

Other names

  • Copper (I) iodide
  • Copper iodide (9CI, ACI)
  • Copper iodide (cui)
  • Copper monoiodide
  • Copper(1+) iodide
  • Copper(l)iodide
  • Cuprous iodide
  • Cuprous iodide,1335-23-5
  • Cuprum Iodatum
  • Hydro-Giene
  • iodocopper
  • Marshite
  • Natural marshite
  • small es, Cyrillicopper monoiodide

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

  • ecfr 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/cuprous-iodide.json