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Quercetin

A plant pigment found in onions, apples, and berries. It may help calm histamine release and support a healthy inflammatory response.

Supplements can interact with medications and aren't right for everyone, especially during pregnancy or breastfeeding, or with a chronic condition. Ask your provider before you start.

Studied for

  • Seasonal allergies (early research)
  • Histamine-related symptoms
  • Antioxidant support
  • Immune support

Found naturally in

  • Onions, especially red onions
  • Apples with the skin
  • Capers
  • Berries
  • Kale and green tea
What variations of quercetin exist?Our top pick, what to skip, and how to read the label

Label red flags

  • Plain quercetin with no absorption support
  • Allergy blends with many ingredients and no amounts listed

Check with a provider

  • Pregnancy or breastfeeding
  • Kidney disease
  • Taking blood thinners, cyclosporine, or other medicines processed by the liver. Quercetin can change their levels.
  • Taking quinolone antibiotics, since quercetin may make them less effective

Related conditions

Chronic spontaneous urticaria

Supplements that contain it

8 products in Dr. Lesher's dispensary list quercetin on the label.

Check with your provider before taking any of these, especially if you're pregnant or take medications.

Parts of the body it affects

Explore what each area does and the conditions that can affect it.

Illustration of blood cells: red blood cells, four kinds of white blood cell, and platelets

Blood & immune system

Blood carries oxygen and nutrients, and white blood cells defend you from infection. In autoimmune disease, that defense system targets your own tissues.

Illustration of the lungs and airways

Lungs

Your lungs bring oxygen in and carry carbon dioxide out. Several autoimmune conditions can inflame or scar lung tissue, often quietly at first.

Illustrations: Servier Medical Art, CC BY 4.0

Dr. Lesher, ND

Ready to find the root cause?

Dr. Lesher is a Naturopathic Doctor who focuses on autoimmune and chronic conditions in women. Since 2020, she's helped hundreds of patients stop managing symptoms and start healing.

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