Red Onions
When it comes to the highest vegetable source of quercetin, look no further than red onions. Red onions — aside from being rich in flavonoids such as quercetin, are also rich in anthocyanins, which protect against chronic conditions such as heart disease and diabetes. It might not seem that way, but red onions are surprisingly packed in vitamin C, making it a great choice alongside oranges and grapefruit as sources of vitamin C. Vitamin C is known not only to help with a variety of bodily functions, but can also increase the bioavailability of the body, allowing you to more easily absorb nutrients.
Metabolism and red blood cell function are the domains of red onions, as regular consumption of this vegetable allows you to benefit from both. Red onions are also the most potent source of quercetin as far as vegetables are concerned, making it the go-to for anyone looking to improve their diet through flavonoids such as quercetin.
Being so high in quercetin, red onions come jam packed with antioxidants, which can help neutralize free radicals that develop within the body. Add that to its cancer-fighting compounds, and you have a vegetable that can be classified as a superfood.
