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Quercetin adalah [[flavonoid]] yang tersebar luas di alam. Nama quercetin digunakan semenjak tahun 1857, dan berasal dari kata ''quercetum'' (hutan [[ek]]).<ref>{{cite web|url=http://www.merriam-webster.com/dictionary/quercetin|title=Quercetin|publisher=Merriam-Webster}}</ref><ref>{{cite web|url=http://www.britannica.com/EBchecked/topic/487030/quercitin|title=Quercitin (biochemistry)|publisher=Encyclopædia Britannica}}</ref> Flavonol ini merupakan inhibitor [[pengangkut auksin polar]] yang muncul secara alami.<ref name="pmid12237347">{{cite journal | author = Fischer C, Speth V, Fleig-Eberenz S, Neuhaus G | title = Induction of Zygotic Polyembryos in Wheat: Influence of Auxin Polar Transport | journal = Plant Cell | volume = 9 | issue = 10 | pages = 1767–80 | date = October 1997 | pmid = 12237347 | pmc = 157020 | doi = 10.1105/tpc.9.10.1767 }}</ref>
 
DalamPada bawang merah, konsetrasi quercetin terbesar ada pada cincin paling luar dan di bagian yang paling dekat dengan akar.<ref>{{cite journal | author = Smith C, Lombard KA, Peffley EB, Liu W |title =Genetic Analysis of Quercetin in Onion (''Allium cepa L.'') ''Lady Raider'' | journal =The Texas Journal of Agriculture and Natural Resource | volume = 16 | pages = 24–8 | publisher = Agriculture Consortium of Texas | year= 2003 | url = http://www.tarleton.edu/~txjanr/2003issue/article3.pdf | format = | archiveurl = http://web.archive.org/web/20070225125621/http%3A//www.tarleton.edu/%7Etxjanr/2003issue/article3.pdf | archivedate = February 25, 2007|deadurl=yes}}</ref> Menurut satu penelitian, [[tomat]] yang tumbuh secara organik memiliki 79% lebih banyak quercetin daripada yang tumbuh secara kimiawi.<ref name="pmid17590007">{{cite journal | author = Mitchell AE, Hong YJ, Koh E, Barrett DM, Bryant DE, Denison RF, Kaffka S | title = Ten-year comparison of the influence of organic and conventional crop management practices on the content of flavonoids in tomatoes | journal = J. Agric. Food Chem. | volume = 55 | issue = 15 | pages = 6154–9 | date = July 2007 | pmid = 17590007 | doi = 10.1021/jf070344 }}</ref> Quercetin ada pada berbagai jenis [[madu]] dari berbagai jenis tanaman.<ref name="pmid21229237">{{cite journal | author = Petrus K, Schwartz H, Sontag G | title = Analysis of flavonoids in honey by HPLC coupled with coulometric electrode array detection and electrospray ionization mass spectrometry | journal = Anal Bioanal Chem | volume = 400 | issue = 8 | pages = 2555–63 | date = June 2011 | pmid = 21229237 | doi = 10.1007/s00216-010-4614-7 }}</ref>
 
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