{
  "$schema": "https://foodadditiveindex.com/api/v1/schema.json",
  "id": "https://foodadditiveindex.com/additives/ferrous-sulfate",
  "slug": "ferrous-sulfate",
  "name": "Ferrous sulfate",
  "identifiers": {
    "e_number": null,
    "ins_number": null,
    "cas_number": "17375-41-6",
    "inchikey": "BAUYGSIQEAFULO-UHFFFAOYSA-L",
    "pubchem_cid": 24393
  },
  "functional_class": null,
  "summary": "Ferrous sulfate is the cheapest and most readily absorbed iron fortificant, used in flour, cereals and infant foods. Its drawback is that it reacts with fats and colours, causing off-flavours and discolouration, which limits where it can be used.",
  "derivation_summary": "Produced by dissolving iron in sulfuric acid, or recovered as a by-product of steel pickling and titanium dioxide manufacture.",
  "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 184.1315",
            "url": "https://www.ecfr.gov/current/title-21/section-184.1315"
          },
          "source": "ecfr",
          "retrieved_at": "2026-09-07T18:25:51.549Z"
        }
      ]
    },
    {
      "jurisdiction": "CODEX",
      "jurisdiction_name": "Codex Alimentarius",
      "authority": "Codex Alimentarius Commission / JECFA",
      "status": "not_listed",
      "status_label": "Not listed",
      "note": "Does not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.",
      "provision_count": 0,
      "provisions": []
    }
  ],
  "names": [
    {
      "name": "13463-43-9",
      "type": "cas",
      "source": "pubchem"
    },
    {
      "name": "17375-41-6",
      "type": "cas",
      "source": "openfoodtox"
    },
    {
      "name": "7720-78-7",
      "type": "cas",
      "source": "pubchem"
    },
    {
      "name": "2IDP3X9OUD",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Blood Stop Powder",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Combiron",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "dried ferrous sulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "DRIED FERROUS SULPHATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "driedferrous sulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Duretter",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Duroferon",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Enteric Coated Ferrous Sulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Exsiccated ferrous sulphate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "exsiccated iron(2+) sulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "FE-Vite Iron Oral Solution",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "FeH2O5S",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferobuff",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferolix",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Feromax",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Feroritard",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferr sulf, dried",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferralyn",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferro-Theron",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrograd",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrosi sulfas",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrosulfat",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrosulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "FERROUS SULFATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous sulfate (1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous Sulfate 324mg Enteric Coated",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous Sulfate 325 mg Green",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous Sulfate 325 mg Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous sulfate anhydrous",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous Sulfate Enteric Coated",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous Sulfate Enteric-Coated",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous sulfate monohydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous sulfate, exsiccated",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous sulfate,dried",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous sulphate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous sulphate (1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "FERROUS SULPHATE ANHYDROUS",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous Sulphate Monohydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "FERROUS SULPHATE, DRIED",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "ferrous;sulfate;hydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Fersolate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferulen",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferusal",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "FeSO4",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "FeSO4.H2O",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "FESO4: FERROUS SULFATE, IRON(II) SULFATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Fespan",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron (as ferrous sulfate)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron (as sulphate)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron monosulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron sulfate (1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron sulfate (FeSO4)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "IRON SULFATE (MONOHYDRATE)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron sulfate anhydrous",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "Iron sulphate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron sulphate (feso4)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "IRON SUPPLEMENT",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron( cento) sulfate hydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron() sulfate hydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(2+) sulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(2+) sulfate (1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "IRON(2+) SULFATE (1:1) HYDRATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(2+) sulfate monohydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "iron(2+) sulfate--water (1/1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(2+) sulfate--water (1/1/1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "IRON(2+) SULPHATE (1:1) HYDRATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "iron(2+);sulfate;hydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(II) sulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(II) sulfate (1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(II) sulfate hydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(II) sulfate hydrate, 99.999% trace metals basis",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "iron(II) sulfate monohydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Irospan",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Kendural",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Kesuka",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Odophos",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "ONE VITE Iron Supplement Liquid",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Quickfloc (salt)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sal chalybis",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "SFE 171",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Slow Fe",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sorbifer durules",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sulfuric acid iron(2+) salt monohydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sulfuric acid, iron(2+) salt (1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sulfuric acid, iron(2+) salt (1:1), monohydrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Tetucur",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "XBDUTCVQJHJTQZ-UHFFFAOYSA-L",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(2+);sulfate;hydrate",
      "type": "iupac",
      "source": "openfoodtox"
    },
    {
      "name": "Iron(II) sulfate hydrate, puriss., meets analytical specification of Ph. Eur., BP, exsiccated, 86.0-89.0% FeSO4 basis",
      "type": "iupac",
      "source": "pubchem"
    },
    {
      "name": "Ferrous sulfate",
      "type": "label",
      "source": "ecfr"
    }
  ],
  "hazard_reference_values": [
    {
      "type": "ADI",
      "value": 12.5,
      "value_text": null,
      "unit": "mg/kg bw/day",
      "population": "consumers",
      "assessing_body": "EFSA",
      "year": 2011,
      "opinion": {
        "ref": "doi:10.2903/j.efsa.2012.2521",
        "url": "https://doi.org/10.2903/j.efsa.2012.2521"
      }
    },
    {
      "type": "ADI",
      "value": 0.8,
      "value_text": null,
      "unit": "mg/kg bw/day",
      "population": "consumers",
      "assessing_body": "EFSA",
      "year": null,
      "opinion": null
    }
  ],
  "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"
    }
  ],
  "citation_policy": "Cite as: Food Additive Index, \"Ferrous sulfate\", https://foodadditiveindex.com/additives/ferrous-sulfate. This site reports regulatory status and does not rate additives.",
  "generated_at": "2026-09-08T00:09:38.541Z"
}