Quercetin bridges two of our niches: a heart-friendly flavonol that also calms the mast-cell histamine release behind many sensitivity symptoms.
What is Quercetin?
Quercetin is a Flavonol that plays a critical role in acting as a natural antihistamine and antioxidant. While many general diets overlook it, maintaining optimal levels of Quercetin is frequently tracked by people working to optimize their Histamine intolerance (DAO).
Top Foods High in Quercetin
A data-driven breakdown of the foods with the highest concentration of Quercetin per 100 g.
| Food | Quercetin |
|---|---|
| Kale | 23 mg |
| Blueberries | 7.5 mg |
| Apple | 4.4 mg |
| Broccoli | 3.2 mg |
| Tomato | 1.6 mg |
How Quercetin Impacts Histamine intolerance (DAO)
Research links diets rich in Quercetin to changes in Histamine intolerance (DAO). Diets naturally abundant in this compound often support lower Histamine intolerance (DAO) markers by stabilising mast cells so they release less histamine.
Scientific references & clinical evidence
This guide is built on peer-reviewed research — verify the primary sources below.
Written by the Nutrition Encyclopedia team · medically reviewed by Dr. Sunaina Tariq, MBBS
Last updated 21 June 2026
How we source & verify data · Medical disclaimer
Nutrition values are approximations compiled from public food-composition databases (USDA FoodData Central) and are provided for educational purposes only — not medical advice.
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