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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.
Commonly used 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
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
Supplements that contain it
Brand nameProduct nameSeasonal allergy formulasComing soon
Brand nameProduct nameHistamine support formulasComing soon
Brand nameProduct nameImmune support formulasComing soon
Brand nameProduct nameSeasonal allergy formulasComing soon
Brand nameProduct nameHistamine support formulasComing soon
Brand nameProduct nameImmune support formulasComing soon
Parts of the body it affects
Explore what each area does and the conditions that can affect it.
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.
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
Wondering if your symptoms fit a pattern?
Dr. Lesher is a naturopathic doctor who specializes in women's autoimmune and chronic conditions. Since 2020, she has helped more than 900 patients overcome and heal from their conditions.