{
  "$schema": "https://foodadditiveindex.com/api/v1/schema.json",
  "id": "https://foodadditiveindex.com/additives/potassium-acid-tartrate",
  "slug": "potassium-acid-tartrate",
  "name": "Potassium acid tartrate",
  "identifiers": {
    "e_number": "E336",
    "ins_number": null,
    "cas_number": "868-14-4",
    "inchikey": "KYKNRZGSIGMXFH-ZVGUSBNCSA-M",
    "pubchem_cid": 23681127
  },
  "functional_class": null,
  "summary": "Potassium acid tartrate is cream of tartar — the acid in baking powder, the stabiliser that lets egg whites hold a stiff peak, and the agent that stops boiled sugar crystallising.",
  "derivation_summary": "Recovered from the crystalline deposit that forms in wine barrels and tanks during fermentation, then purified. It is a genuine by-product of winemaking.",
  "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 184.1077",
            "url": "https://www.ecfr.gov/current/title-21/section-184.1077"
          },
          "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": "868-14-4",
      "type": "cas",
      "source": "ecfr"
    },
    {
      "name": "921-53-9",
      "type": "cas",
      "source": "openfoodtox"
    },
    {
      "name": "Acid potassium tartrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Butanedioic acid 2,3-dihydroxy-, (R-(R*,R*))-, monopotassium salt",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, monopotassium salt",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, potassium salt (1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Butanedioic acid, 2,3-dihydroxy- (theta-(theta,theta))-, monopotassium salt",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Butanedioic acid, 2,3dihydroxy, (R(R*,R*)), monopotassium salt",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "CCRIS 7329",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Cream of tartar",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Cremor tartari",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "E 336",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "Faccla",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Faccula",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Faecla",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Faecula",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "HSDB 1264",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "INS NO.336(I)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "INS-336(I)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "KYKNRZGSIGMXFH-ZVGUSBNCSA-M",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "L-(+)-Tartaric acid monopotassium salt",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Monobasic potassium tartrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Monopotassium 2,3-dihydroxybutanedioate, (R-(R*,R*))-",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Monopotassium 2,3dihydroxybutanedioate, (R(R*,R*))",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Monopotassium tartrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Monopotassium tartrate (336(i))",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "NPT6P8P3UU",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "potassium (2R,3R)-3-carboxy-2,3-dihydroxypropanoate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium acid salt of L(+)tartaric acid",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium acid salt of L-(+)-tartaric acid",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium acid tartrate",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "POTASSIUM ACID TARTRATE (MART.)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium bitartrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "POTASSIUM BITARTRATE (II)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "POTASSIUM BITARTRATE (USP IMPURITY)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "POTASSIUM BITARTRATE (USP MONOGRAPH)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium bitartrate (USP)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "POTASSIUM BITARTRATE (USP-RS)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium hydrogen L-tartrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "POTASSIUM HYDROGEN TARTRATE (EP IMPURITY)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "POTASSIUM HYDROGEN TARTRATE (EP MONOGRAPH)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium hydrogen tartrate (JAN)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "POTASSIUM HYDROGEN TARTRATE [JAN]",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium L-bitartrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium L-tartrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium L-tartrate (kc4H5O6)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium L-tartrate monobasic",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium Lbitartrate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium Ltartrate (KC4H5O6)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium tartrate (KHC4H4O6)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Potassium tartrates",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "potassium;(2R,3R)-2,3,4-trihydroxy-4-oxo-butanoate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Purified cream of tartar",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Tartar",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Tartar cream",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Tartaric acid monopotassium salt",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "E336",
      "type": "e_number",
      "source": "pubchem"
    },
    {
      "name": "dipotassium (2R,3R)-2,3-dihydroxybutanedioate",
      "type": "iupac",
      "source": "openfoodtox"
    },
    {
      "name": "Potassium;2,3,4-trihydroxy-4-oxobutanoate",
      "type": "iupac",
      "source": "openfoodtox"
    },
    {
      "name": "Potassium acid tartrate",
      "type": "label",
      "source": "ecfr"
    }
  ],
  "hazard_reference_values": [
    {
      "type": "ADI",
      "value": 240,
      "value_text": null,
      "unit": "mg/kg bw/day",
      "population": "consumers",
      "assessing_body": "EFSA FAF",
      "year": 2020,
      "opinion": {
        "ref": "doi:10.2903/j.efsa.2020.6030",
        "url": "https://doi.org/10.2903/j.efsa.2020.6030"
      }
    }
  ],
  "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, \"Potassium acid tartrate\", https://foodadditiveindex.com/additives/potassium-acid-tartrate. This site reports regulatory status and does not rate additives.",
  "generated_at": "2026-09-08T00:09:38.640Z"
}