What it means
Quercetin is one of the most abundant dietary flavonoids, found in onions, capers, apples, kale and berries, typically 10–100 mg per day from food. In cells it is an antioxidant, an anti-inflammatory and a weak inhibitor of several kinases. Its senolytic role was identified in 2015 at Mayo, where it cleared senescent endothelial cells while dasatinib cleared senescent fat-cell progenitors — hence the combination.
Supplements provide 500–1,000 mg; absorption is poor and most of what is absorbed is rapidly metabolised.
Why it matters for longevity
The dasatinib + quercetin combination is the senolytic with the most human studies, so quercetin is the only senolytic-adjacent compound most people can obtain. It is also sold for allergy, inflammation and immunity, mostly on cell-culture evidence.
What the evidence says
In mice, dasatinib + quercetin cleared senescent cells, improved physical function and extended post-treatment survival in old animals (Xu 2018). Quercetin alone had no effect on senescent fat progenitors and only modest effects elsewhere.
In humans, the combination was piloted in lung fibrosis (Justice 2019) and diabetic kidney disease (Hickson 2019), both small and uncontrolled. Quercetin alone has a scattered trial record: small reductions in blood pressure in hypertensives (meta-analysis, about 3 mmHg), inconsistent effects on inflammatory markers, no effect on exercise performance in most trials, and nothing on ageing outcomes.
How to measure or use it
- No routine marker. hs-CRP is the only accessible proxy for an anti-inflammatory effect, and the trial signal is weak.
- Taken with fat or as the phytosome form it absorbs better; still, blood levels at supplement doses are far below the concentrations used in cell studies.
- Dasatinib is a prescription chemotherapy drug; the combination is a research protocol, not a supplement stack.
Related
- Supplements that have evidence — where quercetin ranks
- Inflammation and immunity — the inflammation markers that matter
- The longevity drugs — senolytics next to the rest
Frequently asked questions
Is quercetin a senolytic on its own?
Weakly, in cells. The senolytic evidence in animals and humans comes from its combination with dasatinib.
How much quercetin is in food?
Typically 10–100 mg per day in a vegetable-rich diet; onions, capers and apples with skin are the richest sources.
Does it help with inflammation?
Trials show small, inconsistent reductions in some inflammatory markers. It is not a substitute for the levers with evidence — fitness, body fat and sleep.
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