Quercetin is an antioxidant in apples, some berries, leafy green vegetables, red onions and grapes, and tea. It's the reason for the bright colors found in these foods.
This antioxidant may reduce the risk of cardiovascular disease like stroke and coronary heart disease. It may inhibit LDL oxidation, which reduces the risk or progress of atherosclerosis.
Quercetin may help manage metabolic syndrome and overcome obesity, which would lower the risks for cardiovascular disease and type 2 diabetes. In terms of metabolic syndrome, the antioxidant may improve cholesterol and triglyceride levels, hypertension and insulin resistance. It may also reduce growth of new fat cells, which would help control obesity, and regulate amounts of glucose in the blood which could reduce the risk of type 2 diabetes.
Quercetin is an antihistamine, which prevents histamine from being released. Histamine brings on allergies' itchy eyes, runny nose and sneezing. Quercetin may be used in the treatment of cancer to slow or prevent tumor development.
"The medical profession now knows that inflammation plays a part in virtually every chronic disease as well as many acute conditions. Quercetin is a powerful antioxidant that has been shown to promote the reduction of inflammation throughout the body."