In terms of blood strain, irritation, and coronary heart illness, onions have you ever lined. Based on Eating Well, onions comprise a robust mixture of antioxidants and potent flavonoids, together with one known as quercetin, that may reduce high blood pressure. Quercetin has usually been related to lowering the danger of coronary heart illness by thinning the blood and reducing the danger of coronary heart assault, stroke, and different harmful cardiovascular circumstances.