Outdoor & Yard / Compounds / Isoproturon

Isoproturon in the yard and garden

Moderate risk for your yard

Isoproturon — herbicide.

What is isoproturon?

Also known as: Graminon, Tolkan, 3-(4-Isopropylphenyl)-1,1-dimethylurea, Arelon.

CAS number
34123-59-6
Molecular formula
C12H18N2O
Molecular weight
206.28 g/mol
SMILES
CC(C)C1=CC=C(C=C1)NC(=O)N(C)C
PubChem CID
36679

Risk for people, pets,

Moderate risk

Isoproturon — herbicide.

Regulatory consensus

1 regulatory bodyhas classified Isoproturon.

AgencyYearClassificationNotes
EDC Assessment—Suspected endocrine disruptor

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 your yard encounter isoproturon

  • Agricultural Products — crop treatment

Safer alternatives

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

  • Organic mulching; Mechanical weeding; IPM
    Trade-offs: Labor-intensive; effective for small-scale or precision applications; no chemical residues; not scalable to large commercial operations without significant cost increase.
    Relative cost: 2-5× conventional

Frequently asked questions

Is isoproturon safe for your yard?

Isoproturon — herbicide.

What products contain isoproturon?

Isoproturon appears in: crop treatment (Agricultural products).

See Isoproturon in the outdoor app

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

Open in outdoor View raw API data

Sources (1)
  1. PubChem (2026) — database

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 →