What Is Quercetin Used For?

Reviewed on 6/30/2022
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Quercetin is most commonly used for treatment of seasonal allergies, prevention of diabetic cataracts, treatment of viral infections, treatment of cardiovascular disease, as adjunctive therapy in cancer, treatment of chronic prostatitis, and treatment of interstitial cystitis.

Quercetin is a plant pigment (flavonoid) found in fruits and vegetables. It is considered to have anti-inflammatory properties that may improve mental or physical performance and reduce the risk of infection.

Quercetin may be used for: 

What Are Side Effects of Quercetin?

Side effects of quercetin include: 

  • Headache (oral use)
  • Numbness and tingling (oral use)
  • Shortness of breath (intravenous use)
  • Nausea and vomiting (intravenous use)
  • Kidney damage (intravenous use greater than 945 mg/m2)

What Foods Contain Quercetin?

Foods that contain quercetin-type flavanols include:

  • Apples
  • Berries
  • Cruciferous vegetables (broccoli, Brussels sprouts, cabbage, cauliflower, collard greens, kale, and turnips)
  • Capers
  • Grapes
  • Onions
  • Shallots
  • Tea
  • Tomatoes
  • Many seeds, nuts, flowers, barks, and leaves

Certain medicinal botanicals also contain quercetin, including:

  • Ginkgo biloba
  • Hypericum perforatum
  • Sambucus canadensis

What Drugs Interact with Quercetin?

Quercetin may interact with: 

Can Quercetin Be Used During Pregnancy or While Breastfeeding?

  • There is no information available about the use of quercetin during pregnancy or while breastfeeding. As with any other drug or supplement, it's best to consult your doctor on what would be safe for you. 

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Reviewed on 6/30/2022

Image source: iStock Images