Quercetin is a phytochemical (a bioflavinoid) present in the coloured skin of apples and red onions. 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. It can be taken in natural form by consuming apples and red onions and is also available as a dietary supplement.
You may discuss this with your healthcare provider for dosage and other instructions.
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