Onions are the richest natural sources of Quercetin you can find. Quercetin is a powerful antioxidant flavonoid that has been linked to inhibiting certain kinds of cancers. Research and clinical trials have been undertaken to learn more about the effect of the quercetin in onions have on cancer, and it is not considered a drug to combat cancer. Eating onions will give you many good benefits that could lead to preventing cancer, because of the dietary source of quercetin it contains.

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