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Tier-BPublic-ready7/4/2026

Quercetin

Blood pressure and vascular health markers is closer to a research marker, so it should be read separately from a directly felt benefit.

The 60.0 score includes research signals from patient or disease contexts. General supplement evidence is not repeated enough, so the B tier remains conservative.

Representative tier calculated from paper evidence that passed the collection audit.

Papers analyzed
89
Caution signal
Low
Context-specific research signal
60.0
Blood pressure and vascular health markersMale Reproductive Health MarkersCholesterol and triglycerides

Main benefit evidence

The representative ingredient tier is calculated from these target-level evidence groups.

Blood pressure and vascular health
6 studiesTier-B
Blood pressure and vascular health markers
Fairly consistent positive signal in studiesResearch marker focusPatient-group study

This card is closer to a measured biomarker or lab outcome than a directly felt user benefit. These findings come from a defined study population, so everyday effects may differ.

Evidence score
58.5
Study context
Patient-group study

This score reflects the strength of this benefit group. The ingredient tier also considers paper count, repetition, population, and study context.

Men's health
2 studiesTier-C
Male Reproductive Health Markers
Fairly consistent positive signal in studiesResearch marker focusPatient-group study

These findings come from sperm, semen, or hormone markers such as testosterone, LH, FSH, and inhibin B. They are closer to research measurements than a directly felt benefit. These findings come from a defined study population, so everyday effects may differ.

Evidence score
48.7
Study context
Patient-group study

This score reflects the strength of this benefit group. The ingredient tier also considers paper count, repetition, population, and study context.

Blood lipids
1 studiesTier-C
Cholesterol and triglycerides
Some positive signal observedFelt benefit focusPatient-group study

Potential benefit studied in Blood lipids. These findings come from a defined study population, so everyday effects may differ.

Evidence score
42.7
Study context
Patient-group study

This score reflects the strength of this benefit group. The ingredient tier also considers paper count, repetition, population, and study context.

Women's health
1 studiesTier-C
Menstrual and women's health
Some positive signal observedFelt benefit focusPatient-group study

Potential benefit studied in Women's health. These findings come from a defined study population, so everyday effects may differ.

Evidence score
42.1
Study context
Patient-group study

This score reflects the strength of this benefit group. The ingredient tier also considers paper count, repetition, population, and study context.

Recent research

Updated This Month10 new papers

Observed range in repeated studies

This range includes studies in specific patient groups. It is not a general dose or recommendation.

Lower observed study value
12.3
mg/day
Higher observed study value
2000
mg/day
Only ranges repeated in human, oral, single-ingredient studies are shown.
Not personal dosing instructions, recommendations, or safety limits.

Side effects and combination findings in studies

Findings from studies of this ingredient alone are separated from findings involving another supplement or medication.

Caution index
0.6
Caution band: Low
Caution signals
0
Side effects + combos + curated rules
Key precautions
No combination caution signal is clear enough to show right now. This does not guarantee safety.
These are signals reported in studies. They do not predict what will happen to an individual.

Side effects and combination studies

No standalone side-effect or combination signal is currently clear enough to show from the collected papers. This does not mean there is no concern.

Evidence summaries

Paper IDs and full lists are private. Only study types and summaries are shown.

Key Evidence #1
Public scholarly dataCitation signal: 804
observational

[Abstract]: The intake of flavonols, flavones and isoflavones by Japanese women was calculated from our food-phytochemical composition table. The relationship between intake of these phytochemicals and various anthropometric and blood chemistry data was analyz

Key Evidence #2
Public scholarly dataCitation signal: 545
rct

[Abstract]: Epidemiological studies report that quercetin, an antioxidant flavonol found in apples, berries, and onions, is associated with reduced risk of coronary heart disease and stroke. Quercetin supplementation also reduces blood pressure in hypertensive

Key Evidence #3
Public scholarly dataCitation signal: 538
rct

[Abstract]: Regular consumption of flavonoids may reduce the risk for CVD. However, the effects of individual flavonoids, for example, quercetin, remain unclear. The present study was undertaken to examine the effects of quercetin supplementation on blood pres

3 more summariesLimited representative sample by study type.
>
Public scholarly dataCitation signal: 458
review

The antimicrobial activity of quercetin is summarized with a special focus on its mechanistic principle, and the implications for its use as a clinically relevant antimicrobial agent are summarized.

Public scholarly dataCitation signal: 375
observational

It is indicated that quercetin showing inhibitory activity in the early stage of influenza infection provides a future therapeutic option to develop effective, safe and affordable natural products for the treatment and prophylaxis of IAV infections.

Public scholarly dataCitation signal: 251
observational

Investigating if quercetin can ameliorate diabetic encephalopathy by inhibiting ferroptosis and elucidate the potential anti-ferroptotic mechanisms of QE indicated that QE inhibits ferroptosis in the hippocampal neurons by binding to KEAP1 and subsequently upr

Quercetin
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