A natural compound called quercetin, found in foods like apples and onions, may help calm down inflammation in blood vessels by reducing the stickiness of the vessel lining, which could prevent white blood cells from sticking and causing damage.

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Evidence from Studies

Supporting (1)

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Community contributions welcome

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Comparative effects of quercetin and its predominant human metabolites on adhesion molecule expression in activated human vascular endothelial cells.

Cross-Sectional Study

In Vitro

2008 Mar

The study found that quercetin, at the same levels found in the human body after eating fruits and vegetables, can reduce key inflammation signals in blood vessel cells — exactly what the claim says.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Comparative effects of quercetin and its predominant human metabolites on adhesion molecule expression in activated human vascular endothelial cells.

Score: 3

DOI: 10.1016/J.ATHEROSCLEROSIS.2007.07.040

Similar Assertions

A natural compound found in foods like apples and onions, called quercetin, might help calm down inflamed blood vessels by reducing a signal that attracts immune cells — potentially helping to prevent artery damage.

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When your body breaks down quercetin (a plant compound in foods like apples and onions), the resulting molecules aren’t as good at calming down inflammation in your blood vessels as the original quercetin — but they still work a little bit, especially at stopping one specific inflammation signal at a common dose.

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