Flavonoid · Fact sheet
Quercetin
Quercetin is a plant flavonoid with small human studies of blood pressure and biomarkers. Results are mixed, and studies combining it with dasatinib cannot establish the effects of quercetin alone.
What is Quercetin?
Quercetin is present in many plant foods and is also studied as a concentrated supplement. It is distinct from the experimental dasatinib–quercetin drug combination.
Benefits people look for
Inflammation, immune support, allergies, cardiovascular health, and senescent-cell clearance attract interest. These are separate claims with different evidence requirements.
What the evidence supports
- One 93-person study found a modest reduction in systolic blood pressure.
- Mixed overall and subgroup findings do not establish prevention of cardiovascular events or a longevity benefit.
All research areas
- Blood pressure
- Oxidative-stress markers
- Senescence-related research
Anecdotal reports & lived experiences
Reports describe what someone noticed. They cannot establish cause, typical results, or how often a side effect happens.
No attributable personal reports are summarized here yet. The benefits above describe research interests; the side effects below come from the cited medical sources.
We do not fill this gap with unsourced testimonials or estimated success rates.
Side effects & risks
- Short studies in selected participants do not establish long-term safety or uncommon side-effect rates.
- Findings from a combination with a prescription cancer medicine cannot be used as a safety assessment of either ingredient alone.
This is a summary of the cited evidence, not a complete product label. A lack of human safety data does not establish safety.
Clinical research: how strong is it?
Early human evidenceShort crossover studies report small blood-pressure changes in selected groups. A 70-person trial found no overall effect on 24-hour blood pressure, although a hypertension subgroup improved.
Selected research to read
93 participants; small systolic blood-pressure changes over six-week periods.
No overall 24-hour blood-pressure effect; a hypertensive subgroup differed.
FDA approval & research status
Quercetin has no FDA-approved drug indication for the wellness uses discussed here. Supplement availability is not premarket FDA approval of effectiveness or safety.
No FDA-approved use is documented in the records summarized on this page.
Supplement research is not FDA drug approval
Quercetin has no FDA-approved drug indication for the wellness uses discussed here. Supplement availability is not premarket FDA approval of effectiveness or safety.
This summarizes the cited product or research record. Trial phases do not establish successful completion of earlier stages, and a stopped program is not ongoing development. Approval applies only to the labeled product, use and population.
What we still don’t know
- Clinical outcomes beyond small biomarker changes
- Long-term supplement safety and interactions
- Effects of quercetin alone on senescent cells in humans
The takeaway
Mixed overall and subgroup findings do not establish prevention of cardiovascular events or a longevity benefit.
Sources & further reading
Medical evidence and regulatory sources are listed here. Personal reports are linked separately in the experiences section.
- 1pubmedQuercetin crossover study in adults with metabolic risk
93 participants; small systolic blood-pressure changes over six-week periods.
- 2pubmedQuercetin and ambulatory blood pressure
No overall 24-hour blood-pressure effect; a hypertensive subgroup differed.
- 3fdaFDA: what approval means for supplements
Dietary supplements are not approved by FDA for safety and effectiveness before marketing.