Malathion

Malathion is a commonly used insecticide, utilized mainly in the United States. Used to control sucking and chewing insects on fruits and vegetables, and is also used to control mosquitoes, flies, household insects, animal parasites, and lice. However, malathion is dangerous to humans as well. While it does take larger doses to cause negative effects in humans, accidental contact with malathion is not uncommon. Effects can range from dizziness, nausea, and headache, to respiratory problems, convulsions and even death.

Source: CDC