Food & Drink / Compounds / Dioxins and Furans (PCDD/Fs)

Dioxins and Furans (PCDD/Fs) in food: ingestion safety

High risk

90-95% of human dioxin intake is dietary; meat, dairy, fish, and eggs are primary sources; contamination occurs via bioaccumulation in animal fat throughout the food chain.

What is dioxins and furans (pcdd/fs)?

The IUPAC name is 2,3,7,8-tetrachlorodibenzo-p-dioxin.

Also known as: 2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD, Dioxin, Tetradioxin.

IUPAC name
2,3,7,8-tetrachlorodibenzo-p-dioxin
CAS number
1746-01-6
Molecular formula
C12H4Cl4O2
Molecular weight
322.0 g/mol
SMILES
C1=C2C(=CC(=C1Cl)Cl)OC3=CC(=C(C=C3O2)Cl)Cl
PubChem CID
15625

Risk for people

High risk

90-95% of human dioxin intake is dietary; meat, dairy, fish, and eggs are primary sources; contamination occurs via bioaccumulation in animal fat throughout the food chain.

Dietary intervention is the primary practical risk reduction tool for the general population. Vegetarian/vegan diets significantly reduce dioxin body burden.

Regulatory consensus

10 regulatory and scientific bodies have classified Dioxins and Furans (PCDD/Fs). The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC1997Group 1 (carcinogenic to humans)2,3,7,8-TCDD; soft tissue sarcoma, non-Hodgkin lymphoma, lung cancer; reaffirmed 2012
US EPA2012Known/likely to be carcinogenic to humansDioxin reassessment; cancer slope factor established for TCDD
EPA CTX / NIOSH—potential occupational carcinogen
EPA CTX / NTP RoC—Known Human Carcinogen
EPA CTX / IARC—Group 1 - Carcinogenic to humans
EPA CTX / CalEPA—Known human carcinogen
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 1 positive / 2 negative reports)
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 1 positive / 2 negative reports)
EPA CTX / Skin-Eye—Eye Irritation: Category 2A-2B (score: high)
EPA CTX / Skin-Eye—Skin Irritation: Category 2 (score: high)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where you encounter dioxins and furans (pcdd/fs)

  • Food — Fatty fish and seafood, Meat and poultry, Dairy products and cheese, Eggs
    90%+ of human exposure via diet; bioaccumulation in animal fat; highest levels in fatty animal products
  • Environment — Contaminated soil near incinerators and industrial sites, Sediments in polluted waterways, Air emissions from waste combustion
    Released from incomplete combustion processes; persistent in environment with 7-11 year human half-life
  • Occupational Settings — Waste incineration facilities, Paper and pulp bleaching operations, Metal recycling plants, Chemical manufacturing facilities
    Workers in combustion-related industries face elevated exposure; historical exposure in chlorine bleaching processes
  • Drinking Water — Water near industrial discharge areas, Surface water downstream of waste facilities
    Secondary exposure route; contamination typically from environmental sources rather than direct addition

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Dioxins and Furans (PCDD/Fs):

  • NSF-certified activated carbon filtration
    Trade-offs: Does not remove all contaminants. Requires filter replacement.
    Relative cost: 2-5×

Frequently asked questions

Is dioxins and furans (pcdd/fs) safe for you?

90-95% of human dioxin intake is dietary; meat, dairy, fish, and eggs are primary sources; contamination occurs via bioaccumulation in animal fat throughout the food chain.

What products contain dioxins and furans (pcdd/fs)?

Dioxins and Furans (PCDD/Fs) appears in: Fatty fish and seafood (Food); Meat and poultry (Food); Contaminated soil near incinerators and industrial sites (Environment); Sediments in polluted waterways (Environment); Waste incineration facilities (Occupational settings).

Why do regulators disagree about dioxins and furans (pcdd/fs)?

Dioxins and Furans (PCDD/Fs) has been classified by 10 agencies including IARC, US EPA, EPA CTX / NIOSH, EPA CTX / NTP RoC, EPA CTX / IARC, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Dioxins and Furans (PCDD/Fs) in the food app

Look up products containing dioxins and furans (pcdd/fs), compare to alternatives, and explore the full data record.

Open in food View raw API data

Sources (8)
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Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →