Body & Beauty / Compounds / Dibutyl phthalate (DBP)

Dibutyl phthalate (DBP) on your skin: a safety profile

Moderate risk

(People-specific data is limited; this page draws from human adult context.) Dibutyl phthalate (DBP) is a plasticizer used in PVC products, nail polish, hair spray, adhesives, and inks, and historically in food contact materials. IARC Group 3 for carcinogenicity; primary concern is reproductive toxicity as an anti-androgenic endocrine disruptor. Human exposure routes: nail polish application (DBP was a common ingredient; EU banned in 2004; US phase-out largely complete but residual use continues in some products); dietary ingestion via food contact materials; indoor air and dust inhalation from PVC flooring and soft plastics. The US National Health and Nutrition Examination Survey (NHANES) consistently detects DBP metabolites (mono-n-butyl phthalate, MnBP) in >90% of the US adult population. Adults with occupational exposure (nail salon workers, plastics manufacturing) have markedly elevated urinary MnBP. Anti-androgenic effects in adult males: limited epidemiological evidence for reduced semen quality and testosterone levels at NHANES-observed exposure concentrations, though effect sizes are small.

What is dibutyl phthalate (dbp)?

The IUPAC name is dibutyl benzene-1,2-dicarboxylate.

Also known as: dibutyl benzene-1,2-dicarboxylate, dibutyl phthalate, Di-n-butyl phthalate, n-Butyl phthalate.

IUPAC name
dibutyl benzene-1,2-dicarboxylate
CAS number
84-74-2
Molecular formula
C16H22O4
Molecular weight
278.34 g/mol
SMILES
CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC
PubChem CID
3026

Risk for people

Moderate risk

Dibutyl phthalate (DBP) is a plasticizer used in PVC products, nail polish, hair spray, adhesives, and inks, and historically in food contact materials. IARC Group 3 for carcinogenicity; primary concern is reproductive toxicity as an anti-androgenic endocrine disruptor. Human exposure routes: nail polish application (DBP was a common ingredient; EU banned in 2004; US phase-out largely complete but residual use continues in some products); dietary ingestion via food contact materials; indoor air and dust inhalation from PVC flooring and soft plastics. The US National Health and Nutrition Examination Survey (NHANES) consistently detects DBP metabolites (mono-n-butyl phthalate, MnBP) in >90% of the US adult population. Adults with occupational exposure (nail salon workers, plastics manufacturing) have markedly elevated urinary MnBP. Anti-androgenic effects in adult males: limited epidemiological evidence for reduced semen quality and testosterone levels at NHANES-observed exposure concentrations, though effect sizes are small.

Regulatory consensus

13 regulatory and scientific bodies have classified Dibutyl phthalate (DBP). The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC2000Group 3 (not classifiable as to carcinogenicity)IARC Monograph 73 (2000). Insufficient evidence in humans and animals for carcinogenicity classification. However, DBP is a confirmed reproductive toxicant via anti-androgenic mechanism: inhibits testosterone synthesis in fetal Leydig cells during the masculinization programming window (MPW, GD15.5–18.5 in rodents), causing testicular dysgenesis syndrome (TDS) — cryptorchidism, hypospadias, reduced anogenital distance. REACH SVHC (Substance of Very High Concern) — reproductive toxicant Category 1B. EU Annex XIV authorization required for uses. DBP is grouped with DEHP and BBP as the 'anti-androgenic phthalate cluster' of highest concern.
EPA CTX / IRIS—D (Not classifiable as to human carcinogenicity)
EPA CTX / Health Canada—Group VI: CEPA (unclassifiable with respect to carcinogenicity to humans)
EPA CTX / EPA OPP—Group D Not Classifiable as to Human Carcinogenicity
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 1 positive / 4 negative reports)
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 1 positive / 4 negative reports)
EPA CTX / Skin-Eye—Skin Irritation: Not classified (score: low)
EPA CTX / Skin-Eye—Eye Irritation: Not classified (score: low)
EPA CTX / Skin-Eye—Skin Sensitization: Category 1 (score: high)
EPA CTX / Skin-Eye—Eye Irritation: Category 6.4A (Category 2A) (score: high)
EPA CTX / Skin-Eye—skin irritation: in vivo: Studies Indicate No Significant Irritation (score: low)
EPA CTX / Skin-Eye—eye irritation: in vivo: Studies Indicate No Significant Irritation (score: low)
EPA CTX / Skin-Eye—skin sensitisation: in vivo (non-LLNA): Not likely to be sensitizing (score: low)

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 dibutyl phthalate (dbp)

  • Consumer Products — Plastic bottles and containers, Food packaging, Plastic toys and household items
  • Drinking Water — Leaching from plastic pipes, Migration from bottled water containers
  • Indoor Environments — Off-gassing from plastic furniture, Degradation of plastic products
  • Fragrance — perfume, cologne, scented personal care products, household fragrance products, candles
    Identified in Fragrance Ingredient Safety Priority Research database (2,325 ingredients)

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Dibutyl phthalate (DBP):

  • DINCH
    Trade-offs: Performance differences in some applications
    Relative cost: 1.2-2×
  • Fragrance-free formulations
    Trade-offs: Consumer preference for scented products
    Relative cost: Lower (ingredient elimination)
  • Essential oil-based fragrances (with disclosure)
    Trade-offs: Natural does not mean safe — many essential oils are skin sensitizers
    Relative cost: 2-5× conventional

Frequently asked questions

What products contain dibutyl phthalate (dbp)?

Dibutyl phthalate (DBP) appears in: Plastic bottles and containers (Consumer products); Food packaging (Consumer products); Leaching from plastic pipes (Drinking water); Migration from bottled water containers (Drinking water); Off-gassing from plastic furniture (Indoor environments).

Why do regulators disagree about dibutyl phthalate (dbp)?

Dibutyl phthalate (DBP) has been classified by 13 agencies including IARC, EPA CTX / IRIS, EPA CTX / Health Canada, EPA CTX / EPA OPP, EPA CTX / Genetox, 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 Dibutyl phthalate (DBP) in the body app

Look up products containing dibutyl phthalate (dbp), compare to alternatives, and explore the full data record.

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Sources (3)
  1. IARC Monographs Volume 73: Dibutyl Phthalate — Evaluation of Carcinogenic Risks to Humans (Group 3) (2000) — regulatory
  2. US EPA: Dibutyl Phthalate — IRIS Toxicological Review and Reference Doses (2006) — regulatory
  3. ECHA/EU REACH: Dibutyl Phthalate — Substance of Very High Concern (SVHC) Identification, Reproductive Toxicant Category 1B, Annex XIV Restriction (2011) — regulatory

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 →