Baby Safety / Compounds / Methoxychlor

Is Methoxychlor safe for babies and kids?

Elevated risk for kids

Infants accumulate Methoxychlor through breast milk (bioconcentration), placental transfer, and dust ingestion. Persistent pollutants concentrate in fatty tissues with extended half-lives in developing organisms.

What is methoxychlor?

The IUPAC name is 1-methoxy-4-[2,2,2-trichloro-1-(4-methoxyphenyl)ethyl]benzene.

Also known as: 1-methoxy-4-[2,2,2-trichloro-1-(4-methoxyphenyl)ethyl]benzene, p,p'-Methoxychlor, DMDT, Dimethoxy-DDT.

IUPAC name
1-methoxy-4-[2,2,2-trichloro-1-(4-methoxyphenyl)ethyl]benzene
CAS number
72-43-5
Molecular formula
C16H15Cl3O2
Molecular weight
345.6 g/mol
SMILES
COC1=CC=C(C=C1)C(C2=CC=C(C=C2)OC)C(Cl)(Cl)Cl
PubChem CID
4115

Risk for babies

Elevated risk

Infants accumulate Methoxychlor through breast milk (bioconcentration), placental transfer, and dust ingestion. Persistent pollutants concentrate in fatty tissues with extended half-lives in developing organisms.

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

High risk

Methoxychlor persists in maternal adipose tissue and is mobilized during pregnancy and lactation. Lipophilic pollutants concentrate in breast milk and cross the placenta during critical developmental windows.

Known reproductive toxicant (GHS H360) or confirmed endocrine disruptor. Placental transfer is presumed. Fetal exposure during critical developmental windows may cause structural malformations, growth restriction, or functional deficits.

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

Regulatory consensus

9 regulatory and scientific bodies have classified Methoxychlor. The classifications differ — that's the data.

AgencyYearClassificationNotes
Multiple—Endocrine disruptor
EPA CTX / NIOSH—potential occupational carcinogen
EPA CTX / IRIS—D (Not classifiable as to human carcinogenicity)
EPA CTX / IARC—Group 3 - Not classifiable as to its carcinogenicity to humans
EPA CTX / EPA OPP—Group D Not Classifiable as to Human Carcinogenicity
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 1 positive / 9 negative reports)
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 1 positive / 9 negative reports)
EPA CTX / Skin-Eye—Skin Irritation: SkinIrr2 (score: high)
EPA CTX / Skin-Eye—Skin Sensitization: Not classified (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 kids encounter methoxychlor

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Methoxychlor:

  • Physical/mechanical pest control (IPM)
    Trade-offs: More labor-intensive. May not be sufficient for severe infestations.
    Relative cost: 1.2-2×

Frequently asked questions

Is methoxychlor safe for kids?

Infants accumulate Methoxychlor through breast milk (bioconcentration), placental transfer, and dust ingestion. Persistent pollutants concentrate in fatty tissues with extended half-lives in developing organisms.

What products contain methoxychlor?

Methoxychlor appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

What should I do if my child is exposed to methoxychlor?

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 methoxychlor?

Methoxychlor has been classified by 9 agencies including Multiple, EPA CTX / NIOSH, EPA CTX / IRIS, EPA CTX / IARC, EPA CTX / EPA OPP, 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 Methoxychlor in the baby app

Look up products containing methoxychlor, compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (3)
  1. US EPA Methoxychlor Voluntary Cancellation — Endocrine Disruption Concerns, HPTE Estrogenic Metabolite, Registration Review Decision, 2003 (2003) — regulatory
  2. ATSDR Toxicological Profile: Methoxychlor — Estrogenic Activity, Reproductive Toxicity, Endocrine Disruption, Aquatic Toxicity, Environmental Fate (2002) — regulatory
  3. Skinner et al.: Transgenerational Epigenetic Actions of Methoxychlor — Altered DNA Methylation in Reproductive Tissues, Multi-generational Effects, Endocrine Disruption Mechanism (2005) — study

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 →