Effect of Quercetin Rich Onion Extracts on Bacterial Quorum Sensing.
Quecan BXV, Santos JTC, Rivera MLC, Hassimotto NMA, Almeida FA, Pinto UM.
Front Microbiol. 2019 Apr 24;10:867. doi: 10.3389/fmicb.2019.00867

The effect of using different types and rates of onion-water extract in meatball production on the formation of heterocyclic aromatic amines.
Nuray M, Oz F.
J Sci Food Agric. 2019 May;99(7):3538-3547. doi: 10.1002/jsfa.9574.

Inhibitory Effect of Garlic, Purple Onion, and White Onion on Key Enzymes Linked with Type 2 Diabetes and Hypertension.
Oboh G, Ademiluyi AO, Agunloye OM, Ademosun AO, Ogunsakin BG.
J Diet Suppl. 2019;16(1):105-118. doi: 10.1080/19390211.2018.1438553

Effects of Digested Onion Extracts on Intestinal Gene Expression: An Interspecies Comparison Using Different Intestine Models.
de Wit NJ, Hulst M, Govers C, van der Meulen J, van Hoef A, Stoopen G, Hamers A, Hoekman A, de Vos R, Bovee TF, Smits M, Mes JJ, Hendriksen PJ.
PLoS One. 2016 Sep 15;11(9):e0160719. doi: 10.1371/journal.pone.0160719

Assessment of antioxidant capacities and phenolic contents of nigerian cultivars of onions (Allium cepa L) and garlic (Allium sativum L).
Onyeoziri UP, Romanus EN, Onyekachukwu UI.
Pak J Pharm Sci. 2016 Jul;29(4):1183-8.

Antifungal saponins from bulbs of white onion, Allium cepa L.
Lanzotti V, Romano A, Lanzuise S, Bonanomi G, Scala F.
Phytochemistry. 2012 Feb;74:133-9. doi: 10.1016/j.phytochem.2011.11.008.

Flavonol content and biometrical traits as a tool for the characterization of "Cipolla di Giarratana": a traditional Sicilian onion landrace.
Riggi E, Avola G, Siracusa L, Ruberto G.
Food Chem. 2013 Oct 15;140(4):810-6. doi: 10.1016/j.foodchem.2012.10.134.

The onion (Allium cepa L.), white or red, belongs to the family of Liliaceae.

The onion contains flavonoids, very useful to the human body as robust antioxidants found in the outermost layers of this interesting vegetable.

It should be eaten raw so as not to lose the healing properties of flavonoids and sulfur derivatives present in this vegetable.

Animal studies have shown the effectiveness of onion as an anticoagulant.

Human studies have found the usefulness of onion combined with other vegetables to prevent cardiovascular problems.

As an anti-inflammatory, a component of the onion, Onionin A found in the bulb, has been shown to perform an action to counteract inflammatory blood activity (1).

There would also appear to be an action to improve the balance of blood sugar.

It is recommended, along with garlic, shallots and chives to prevent prostate cancer (2).

The best known white onions in Italy are the Cipolla di Giarratana.

White onion studies

References_____________________________________________

(1) Onionin A, a sulfur-containing compound isolated from onions, impairs tumor development and lung metastasis by inhibiting the protumoral and immunosuppressive functions of myeloid cells.  Fujiwara Y, Horlad H, Shiraishi D, Tsuboki J, Kudo R, Ikeda T, Nohara T, Takeya M, Komohara Y.  Mol Nutr Food Res. 2016 Nov;60(11):2467-2480. doi: 10.1002/mnfr.201500995.

(2) Chemoprevention of prostate cancer: what can be recommended to patients?
Colli JL, Amling CL.
Curr Urol Rep. 2009 May;10(3):165-71. Review.