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Qrc6.0
Quercetin Research
Likely helps
249 peer-reviewed studies
What the evidence says
Likely helps
Quercetin appears to help in 12 of 13 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1993–2026 with a typical study size of 55 participants.
Based on 249 studies · 33 meta-analyses · 155 RCTs · 910,146 total participants
Confidence
High confidence
What the studies found
12helped1unclear· 236 more without graded effect data
Women's healthMay help manage menopausal symptoms like hot flashes and mood changes · 4-8 weeks · Supports healthy estrogen metabolism and hormonal equilibrium · 4-8 weeks
Mostly mechanism / observational7 studies
Cognitive function
Mostly mechanism / observational6 studies
Depression & mood
Mostly mechanism / observational4 studies
Men's vitality
Too few graded studies2 studies
Liver health
Too few graded studies2 studies
By the numbers
Pulled from 54 studies with measurable effects
Likely real effects
80%
across studies
People studied
910k
typical study: 55 people
Strongest designs
188
33 pooled, 155 randomised
Showed benefit
92%
12/13 studies
How long studies ran
1–4 weeks
1
1–3 months
5
3+ months
1
Populations Studied
Humans4
General population3
COVID-19 patients2
Cancer patients2
Active research area
94 studies in the last 5 years · Latest meta-analysis: 2026
199320092026
1Tyrosinase inhibition and melanin reductionMeta-Analysisn=1,398 · large study2025
Okselni T et al. · Naunyn-Schmiedeberg's archives of pharmacology (2025)
Noticeable benefit
← WorseNo effectBetter →
Furthermore, quercetin significantly inhibited tyrosinase activity (Z-score, 1.95), resulting in a significantly reduced melanin content (Z-score, 2.56).
A significant reduction in DNA damage (Z-score, 3.27), melanoma cell viability (Z-score, 2.97), and tumor formation was also observed to ensure the promising activity of quercetin for skin issues.
This review highlights quercetin's potential as a multifaceted agent in skin care and treatment.
2DAS28 improvementMeta-Analysisn=3,852 · very large study2023
In plain English: Dietary polyphenols may improve DAS28, reduce C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR), and improve oxidative stress, etc.
Long Z et al. · Frontiers in immunology (2023)
Dietary polyphenols may improve DAS28, reduce C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR), and improve oxidative stress, etc.
However, more RCTs are needed to verify or modify the efficacy and safety of dietary polyphenols.
3ADHD symptom improvementMeta-Analysisn=3,650 · very large study2024
In plain English: The rankings of safety and efficacy of the 12 antioxidants vary.
Zhou P et al. · PloS one (2024)
The rankings of safety and efficacy of the 12 antioxidants vary.
Due to the low methodological quality of the included studies, the probability ranking cannot fully explain the clinical efficacy, and the results need to be interpreted with caution.
More high-quality studies are still needed to verify our findings.
4COPD improvementMeta-Analysisn=894 · large study2025
In plain English: This systematic review confirms that the efficacy of dietary polyphenols is significantly composition-specific.
Wu D et al. · Frontiers in immunology (2025)
This systematic review confirms that the efficacy of dietary polyphenols is significantly composition-specific.
Curcumin and salidroside can improve the course of COPD by regulating blood pressure, inflammation, and the coagulation pathway, supporting the hypothesis of "polyphenol targeting of metabolic-inflammatory networks".
However, the possible negative effects of anthocyanins warn against ingredient heterogeneity.
In plain English: Heat-clearing herbs are useful and promising for the protection against and prevention of ischemic encephalopathy.
Zhao A et al. · Annals of medicine (2024)
Heat-clearing herbs are useful and promising for the protection against and prevention of ischemic encephalopathy.
It can be seen that the components of heat-clearing Chinese medicines can exert cerebroprotective effects through multiple pathways, which provides us with a reference for further development and study of heat-clearing Chinese medicines in the treatment of ischemic cerebrovascular diseases.
In plain English: This review underscores the potential of quercetin as a promising therapeutic agent for managing ovarian-related reproductive disorders.
Zhang X et al. · Phytomedicine : international journal of phytotherapy and phytopharmacology (2025)
This review underscores the potential of quercetin as a promising therapeutic agent for managing ovarian-related reproductive disorders.
Given its diverse biological activities, quercetin may offer significant clinical benefits in female reproductive medicine.
Nonetheless, further investigations are warranted to determine its long-term efficacy, optimal dosing strategies, and specific molecular targets across various ovarian pathologies.
18Quercetin bioavailabilityMeta-Analysisn=31 · small study2025
In plain English: This review summarises key factors that enhance quercetin bioavailability, contributing to the development of more effective and practical quercetin supplements or functional foods for better bioac...
Liu L et al. · Food chemistry (2025)
This review summarises key factors that enhance quercetin bioavailability, contributing to the development of more effective and practical quercetin supplements or functional foods for better bioactivity of quercetin in humans.
20Systolic blood pressureMeta-Analysisn=896 · large study2020
In plain English: Quercetin intake resulted in significantly decreased BP in humans.
Huang H et al. · Nutrition reviews (2020)
Noticeable benefit
← WorseNo effectBetter →
Likely real
Pooled results showed that quercetin significantly lowered both systolic BP (WMD, -3.09 mmHg; 95%CI, -4.59 to -1.59; P = 0.0001) and diastolic BP (WMD, -2.86 mmHg; 95%CI, -5.09 to -0.63; P = 0.01).
Quercetin intake resulted in significantly decreased BP in humans.
Moreover, participants who consumed quercetin for 8 weeks or more showed significantly changed levels of high-density lipoprotein cholesterol and triglycerides in trials with a parallel design.