Ground limestone

Ground limestone is calcium carbonate used as a calcium source, an acidity regulator and a dough conditioner. It is the same mineral as chalk and eggshell.

Where it is and isn’t permitted

Status of Ground limestone 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 184.1409retrieved 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

Quarried limestone, washed and milled to food grade. In the United Kingdom, adding calcium to white flour has been a legal requirement since wartime rationing.

  • Vegan
  • Vegetarian
InChIKey
VTYYLEPIZMXCLO-UHFFFAOYSA-L
PubChem
CID 10112

Every name it appears under

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

CAS registry number

  • 471-34-1

As it appears in regulation

  • Ground limestone

Other names

  • Aeromatt
  • Akadama
  • Albacar
  • Albafil
  • Albaglos
  • Albaglos SF
  • Allied whiting
  • Aragonite
  • Atomite
  • Calcene CO
  • Calcene NC
  • Calcicoll
  • CALCIUM CARBONATE
  • Calcium carbonate (1:1)
  • Calmos
  • Calmote
  • Calofort S
  • Calofort T
  • Calofort U
  • Calopake F
  • Calopake FS
  • Calopake H
  • Calopake PC
  • Calseeds
  • Caltec
  • Caltrate
  • Calwhite
  • Camel-carb
  • Camel-tex
  • Camel-wite
  • Carbium
  • Carbonic acid calcium salt (1:1)
  • Carusis P
  • Chemcarb
  • Clefnon
  • Dacote
  • Duramite
  • Gilder's whiting
  • Hakuenka CC
  • Hakuenka CCR
  • Hakuenka DD
  • Hakuenka O
  • Hakuenka PX
  • Hakuenka PZ
  • Homocal D
  • Hydrocarb
  • Kotamite
  • Levigated chalk
  • Marble dust
  • Marble white
  • Marfil
  • Microcarb
  • Micromya
  • Multifex MM
  • Multiflex MM
  • Multiflex SC
  • Neoanticid
  • Precipitated calcium carbonate
  • Tums

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/ground-limestone.json