Aids in allergic effects and anti-oxidation
 
Quercetin is a kind of natural Flavonoid, it has the most bio-active function among the Flavonoids. It is found in natural vegetables and fruits including onion, celery, apple and grapefruit, etc. Purple onion has the highest amount of Quercetin comparing with the other plants. Quercetin is a very strong anti-oxidation with the anti-oxidizing power more than vitamin E and vitamin C with 50 times and 20 times respectively. The molecule of Quercetin is very small, so it is very easy to be absorbed in to human body without accumulation.
According to the 「Journal of Allergy and Clinical Immunology」, Quercetin is the most anti-allergic bio-active substance among the Flavonoids, the followings are the bio-active function of Quercetin:
 
Effective Anti-Histamine
Research stated that Quercetin is very effective anti-histamine which can block the cells to receive the histamine from outside stimulation. Histamine is a protein which can initiate nasal congestion, sneeze, running nose, tearful eyes and other allergic responses. Quercetin can alleviate the symptoms from the allergic reactions including nasal congestion, sneeze, running nose, tearful eyes and itching skin.