{
  "$schema": "https://foodadditiveindex.com/api/v1/schema.json",
  "id": "https://foodadditiveindex.com/additives/calcium-hydroxide",
  "slug": "calcium-hydroxide",
  "name": "Calcium hydroxide",
  "identifiers": {
    "e_number": "E526",
    "ins_number": "526",
    "cas_number": "1305-62-0",
    "inchikey": "AXCZMVOFGPJBDE-UHFFFAOYSA-L",
    "pubchem_cid": 6093208
  },
  "functional_class": "Acidity regulator",
  "summary": "Calcium hydroxide, or slaked lime, is a firming agent and acidity regulator. Its best-known use is nixtamalisation — soaking maize in lime water, which is what makes tortillas possible and releases the niacin in the grain.",
  "derivation_summary": "Made by adding water to calcium oxide, which is itself produced by heating limestone.",
  "regulatory_status": [
    {
      "jurisdiction": "US",
      "jurisdiction_name": "United States",
      "authority": "Food and Drug Administration",
      "status": "permitted",
      "status_label": "Permitted",
      "provision_count": 1,
      "provisions": [
        {
          "status": "permitted",
          "food_category": null,
          "max_level": null,
          "max_level_unit": null,
          "conditions": null,
          "effective_from": null,
          "citation": {
            "ref": "21 CFR 184.1205",
            "url": "https://www.ecfr.gov/current/title-21/section-184.1205"
          },
          "source": "ecfr",
          "retrieved_at": "2026-09-07T18:25:51.549Z"
        }
      ]
    },
    {
      "jurisdiction": "CODEX",
      "jurisdiction_name": "Codex Alimentarius",
      "authority": "Codex Alimentarius Commission / JECFA",
      "status": "permitted_with_conditions",
      "status_label": "Permitted, with conditions",
      "provision_count": 8,
      "provisions": [
        {
          "status": "permitted",
          "food_category": null,
          "max_level": null,
          "max_level_unit": "GMP",
          "conditions": null,
          "effective_from": "1999",
          "citation": {
            "ref": "CXS 192-1995 Table Three, INS 526",
            "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/"
          },
          "source": "gsfa",
          "retrieved_at": "2026-09-07T07:54:15.059Z"
        },
        {
          "status": "permitted_with_conditions",
          "food_category": {
            "system": "codex",
            "code": "01.2.1.2",
            "name": "Fermented milks (plain), heat-treated after fermentation"
          },
          "max_level": null,
          "max_level_unit": "GMP",
          "conditions": "GSFA notes: 631",
          "effective_from": "2024",
          "citation": {
            "ref": "CXS 192-1995 Table One, INS 526, food category 01.2.1.2",
            "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/"
          },
          "source": "gsfa",
          "retrieved_at": "2026-09-07T07:54:15.059Z"
        },
        {
          "status": "permitted_with_conditions",
          "food_category": {
            "system": "codex",
            "code": "01.8.2",
            "name": "Dried whey and whey products, excluding whey cheeses"
          },
          "max_level": null,
          "max_level_unit": "GMP",
          "conditions": "GSFA notes: XS331",
          "effective_from": "2023",
          "citation": {
            "ref": "CXS 192-1995 Table One, INS 526, food category 01.8.2",
            "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/"
          },
          "source": "gsfa",
          "retrieved_at": "2026-09-07T07:54:15.059Z"
        },
        {
          "status": "permitted_with_conditions",
          "food_category": {
            "system": "codex",
            "code": "02.2.1",
            "name": "Butter"
          },
          "max_level": null,
          "max_level_unit": "GMP",
          "conditions": null,
          "effective_from": "2008",
          "citation": {
            "ref": "CXS 192-1995 Table One, INS 526, food category 02.2.1",
            "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/"
          },
          "source": "gsfa",
          "retrieved_at": "2026-09-07T07:54:15.059Z"
        },
        {
          "status": "permitted_with_conditions",
          "food_category": {
            "system": "codex",
            "code": "13.1.1",
            "name": "Infant formulae"
          },
          "max_level": 2000,
          "max_level_unit": "mg/kg",
          "conditions": "GSFA notes: 55 & 551",
          "effective_from": "2026",
          "citation": {
            "ref": "CXS 192-1995 Table One, INS 526, food category 13.1.1",
            "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/"
          },
          "source": "gsfa",
          "retrieved_at": "2026-09-07T07:54:15.059Z"
        },
        {
          "status": "permitted_with_conditions",
          "food_category": {
            "system": "codex",
            "code": "13.1.2",
            "name": "Follow-up formulae"
          },
          "max_level": null,
          "max_level_unit": "GMP",
          "conditions": "GSFA notes: 551",
          "effective_from": "2026",
          "citation": {
            "ref": "CXS 192-1995 Table One, INS 526, food category 13.1.2",
            "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/"
          },
          "source": "gsfa",
          "retrieved_at": "2026-09-07T07:54:15.059Z"
        },
        {
          "status": "permitted_with_conditions",
          "food_category": {
            "system": "codex",
            "code": "13.1.3",
            "name": "Formulae for special medical purposes for infants"
          },
          "max_level": 2000,
          "max_level_unit": "mg/kg",
          "conditions": "GSFA notes: 55 & 551",
          "effective_from": "2026",
          "citation": {
            "ref": "CXS 192-1995 Table One, INS 526, food category 13.1.3",
            "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/"
          },
          "source": "gsfa",
          "retrieved_at": "2026-09-07T07:54:15.059Z"
        },
        {
          "status": "permitted_with_conditions",
          "food_category": {
            "system": "codex",
            "code": "13.2",
            "name": "Complementary foods for infants and young children"
          },
          "max_level": null,
          "max_level_unit": "GMP",
          "conditions": "GSFA notes: XS73",
          "effective_from": "2023",
          "citation": {
            "ref": "CXS 192-1995 Table One, INS 526, food category 13.2",
            "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/"
          },
          "source": "gsfa",
          "retrieved_at": "2026-09-07T07:54:15.059Z"
        }
      ]
    }
  ],
  "names": [
    {
      "name": "1305-62-0",
      "type": "cas",
      "source": "ecfr"
    },
    {
      "name": "Bell mine",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Biocalc",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "BTTE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calbit",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcarea caustica",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcium dihydoxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcium dihydroxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcium hydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcium hydroxide",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "Calcium hydroxide (Ca(OH)2)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcium hydroxide ACS grade",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcium Hydroxide FCC",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcium Hydroxide FCC, oxalate ID test 98%+ total alkali",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "calcium(2+) hydroxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "calcium(II) hydroxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Caldic 1000",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calvit",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "CaO2",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Caustic lime",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "E 526",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "geloeschter Kalk",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Hydralime",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Hydrated lime",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "Hydroxide, Calcium",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "INS NO.526",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "INS-526",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Kalkhydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Kalziumhydroxid",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Kemikal",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Kentoku K 100",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Limbux",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Lime hydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Lime milk",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Lime water",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Loeschkalk",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Milk of lime",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "NICC 3000",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "O2 Patch",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "PF5DZW74VN",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Rhenofit CF",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Slaked lime",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "Slaked-lime",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Super Microstar",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Yukijirushisakanyo",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "E526",
      "type": "e_number",
      "source": "openfoodtox"
    },
    {
      "name": "526",
      "type": "ins",
      "source": "gsfa"
    },
    {
      "name": "Calcium;dihydroxide",
      "type": "iupac",
      "source": "openfoodtox"
    },
    {
      "name": "Calcium hydroxide",
      "type": "label",
      "source": "ecfr"
    }
  ],
  "hazard_reference_values": [],
  "sources": [
    {
      "key": "ecfr",
      "name": "Electronic Code of Federal Regulations, Title 21",
      "publisher": "U.S. Government Publishing Office / National Archives",
      "licence": "Public domain",
      "url": "https://www.ecfr.gov/api/versioner/v1/full/2026-08-31/title-21.xml",
      "retrieved_at": "2026-09-07T18:25:51.549Z"
    },
    {
      "key": "gsfa",
      "name": "Codex General Standard for Food Additives (CXS 192-1995)",
      "publisher": "Codex Alimentarius Commission (FAO/WHO)",
      "licence": "FAO terms — non-commercial use with attribution",
      "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/",
      "retrieved_at": "2026-09-07T07:54:15.059Z"
    }
  ],
  "citation_policy": "Cite as: Food Additive Index, \"Calcium hydroxide\", https://foodadditiveindex.com/additives/calcium-hydroxide. This site reports regulatory status and does not rate additives.",
  "generated_at": "2026-09-08T00:09:38.450Z"
}