It has powerful antioxidant, anti-histamine, and anti-inflammatory action. Research has shown it to be useful for allergic conditions, asthma, hay fever
, rheumatoid arthritis, and lupus. It is also used in diabetes and cancer.
Quercetin inhibits the production and release of histamine and other allergic/inflammatory substances. Histamine is a substance that is responsible for the allergic symptoms in the body.