Baby Safety / Compounds / Di-n-octyl phthalate (DNOP)

Is Di-n-octyl phthalate (DNOP) safe for babies and kids?

Moderate risk for kids

Infants are highly exposed to Di-n-octyl phthalate (DNOP) through mouthing of plastic toys, teethers, bottles, and food packaging leachates. Endocrine disruption risk is amplified during critical windows of reproductive and neurological development.

What is di-n-octyl phthalate (dnop)?

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

Also known as: dioctyl benzene-1,2-dicarboxylate, Dioctyl phthalate, DI-N-OCTYL PHTHALATE, DNOP.

IUPAC name
dioctyl benzene-1,2-dicarboxylate
CAS number
117-84-0
Molecular formula
C24H38O4
Molecular weight
390.6 g/mol
SMILES
CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC
PubChem CID
8346

Risk for babies

Moderate risk

Infants are highly exposed to Di-n-octyl phthalate (DNOP) through mouthing of plastic toys, teethers, bottles, and food packaging leachates. Endocrine disruption risk is amplified during critical windows of reproductive and neurological development.

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Elevated risk

Prenatal exposure to Di-n-octyl phthalate (DNOP) is associated with endocrine disruption affecting fetal reproductive development. Phthalates and alternative plasticizers cross the placenta and are detectable in amniotic fluid.

Suspected reproductive toxicant (GHS H361) or suspected endocrine disruptor. Precautionary approach warranted. Animal studies or limited human data suggest developmental toxicity potential.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

3 regulatory and scientific bodies have classified Di-n-octyl phthalate (DNOP). The classifications differ — that's the data.

AgencyYearClassificationNotes
US EPA IRIS / ECHA (DNOP — di-n-octyl phthalate — US EPA IRIS chronic oral RfD 10 mg/kg/day (1987 assessment); anti-androgenic phthalate plasticizer with moderate peroxisome proliferator activity and reproductive toxicity in high-dose rodent studies; not on ECHA SVHC candidate list as individual compound; not classified for carcinogenicity by IARC, NTP, EFSA, or US EPA; high-molecular-weight phthalate with lower reproductive toxicity potency than DEHP, DBP, or BBP; used in PVC wire insulation, flooring, and automotive applications)2019no carcinogenicity classification; US EPA chronic oral RfD 10 mg/kg/day; anti-androgenic phthalate; lower reproductive toxicity than short-chain phthalates; high-MW PVC plasticizer; not classified by IARC, NTP, EFSA, or US EPA for carcinogenicity
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 1 negative reports)
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 1 negative reports)

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 kids encounter di-n-octyl phthalate (dnop)

  • 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

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Di-n-octyl phthalate (DNOP):

  • 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

Is di-n-octyl phthalate (dnop) safe for kids?

Infants are highly exposed to Di-n-octyl phthalate (DNOP) through mouthing of plastic toys, teethers, bottles, and food packaging leachates. Endocrine disruption risk is amplified during critical windows of reproductive and neurological development.

What products contain di-n-octyl phthalate (dnop)?

Di-n-octyl phthalate (DNOP) 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).

What should I do if my child is exposed to di-n-octyl phthalate (dnop)?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Why do regulators disagree about di-n-octyl phthalate (dnop)?

Di-n-octyl phthalate (DNOP) has been classified by 3 agencies including US EPA IRIS / ECHA (DNOP — di-n-octyl phthalate — US EPA IRIS chronic oral RfD 10 mg/kg/day (1987 assessment); anti-androgenic phthalate plasticizer with moderate peroxisome proliferator activity and reproductive toxicity in high-dose rodent studies; not on ECHA SVHC candidate list as individual compound; not classified for carcinogenicity by IARC, NTP, EFSA, or US EPA; high-molecular-weight phthalate with lower reproductive toxicity potency than DEHP, DBP, or BBP; used in PVC wire insulation, flooring, and automotive applications), EPA CTX / Genetox, 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 Di-n-octyl phthalate (DNOP) in the baby app

Look up products containing di-n-octyl phthalate (dnop), compare to alternatives, and explore the full data record.

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Sources (1)
  1. US EPA IRIS DNOP Di-n-Octyl Phthalate Chronic Oral RfD 10 mg/kg/day; Anti-Androgenic Peroxisome Proliferator; Lower Potency Than DEHP DBP; High-MW PVC Plasticizer; No IARC NTP EFSA EPA Carcinogenicity Classification; MOP Biomonitoring Metabolite (2019) — 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 →