Editing Pyrethrin (section)

===Chronic pyrethrin toxicity in humans===
[[Chronic toxicity]] in humans occurs most quickly through [[Breathing|respiration]] into the lungs, or more slowly through absorption through the skin.<ref name="Pyrethrins 1994"/> [[Allergic reactions]] may occur after exposure, leading to itching and irritated skin as well as burning sensations.<ref>{{cite journal |doi=10.3109/10408449009089874 |pmid=2083034 |title=An Assessment of the Toxicological Properties of Pyrethroids and Their Neurotoxicity |journal=Critical Reviews in Toxicology |volume=21 |issue=2 |pages=89–104 |year=1990 |last1=Aldridge |first1=W. N. }}</ref> These types of reactions are rare because the allergenic component of pyrethrin in semi-synthetic pyrethroids has been removed.<ref name="EPA review"/> The metabolite compounds of pyrethrin are less toxic to mammals than their originators, and compounds are either broken down in the [[liver]] or [[gastrointestinal tract]], or excreted through feces; no evidence of storage in tissues has been found {{citation needed|date=July 2021}}.