The following herbicides have an oral LD50 of >1 gm/kg and have little or no acute toxicity in humans: Alachlor, Amitrole, Ammonium sulfamate, Atrazine, Dalapon, Dicamba, Glyphosphate, Monuron, Oryzalin, Picloram, Propanil, Simazine, etc. [LaDou, p. 613] A mild skin irritant; Injury to the brain, heart, liver, lungs, kidneys, ovaries, and endocrine organs are observed in chronic feeding studies of experimental animals. [EXTOXNET] For the triazine herbicides, systemic toxicity unlikely unless large amounts are ingested; May cause irritation; [EPA Pesticides, p. 121] TLV basis: hematologic, reproductive and developmental effects; 3.3 mg/kg/day is NOEL in chronic feeding studies of rats for anemia and mammary tumors. [ACGIH] "Our analyses did not find any clear associations between atrazine exposure and any cancer analyzed." [
PMID 15367570]