Do All Onions Have Quercetin? (EXPLAINED)

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Do onions have Quercetin?

Onions are the most commonly cultivated member of the Allium family, and people have been growing them for over 7,000 years. A savory vegetable, onions offer many health benefits and come in a wide range of types. The question we are asking today is, do all onions have quercetin?

Quick Answer: Yes – All onions do contain quercetin. Compared to other similar foods, their quercetin content is very high.

Quercetin Content of Onions

Depending on the variety, onions can contain 8.06 to 31.77 mg of quercetin per 100-gram serving. Onions are also high in fiber, folate, phosphorus, and magnesium.

Are Onions High in Quercetin?

Compared to other foods, onions are very high in quercetin.

Let’s take a look at how they compare to 5 similar foods.

  • Onions are much higher in quercetin than their cousin garlic which only supplies 1.74 mg per 100g.
  • Ginger, another savory root noted to be healthy, doesn’t compare to onions. It contains no quercetin.
  • Potatoes, on average, only offer 0.73 mg of quercetin per 100-gram serving. Much less than any onion.
  • Red lettuce has close to the same amount of quercetin as red onions with 30.6 mg/100g
  • Oregano slightly exceeds onions maximum quercetin content providing 42.0 mg per 100g. 


USDA Database for the Flavonoid Content of Selected Foods: 

Health Line “9 Impressive Health Benefits of Onions”: