PlainPill

Quercetin

People mainly take Quercetin for immunity, pain & inflammation, longevity. Based on 150 first-hand reports and 207 meta-analyses & systematic reviews in the medical literature. Ranked #529 of 1,974 overall.

26
User score
Mixed
13% positive7% mixed3% negative77% unclear

Of reports that state an outcome, 57% are positive.

Clinical research
AStrong research base
207
meta-analyses
232
RCTs
33,149
papers

What Quercetin does, according to users

Of the people who reported each effect, the share who said it got better.

What the research says

Systematic reviews and meta-analyses from PubMed, with their published conclusions.

AStrong research base

3+ meta-analyses or systematic reviews and 10+ randomized controlled trials in humans. The grade measures how much human research exists — read the conclusions below for what it found.

Ann Med · 2023 · Meta-analysis / systematic review
Medicine for chronic atrophic gastritis: a systematic review, meta- and network pharmacology analysis

Conclusion: The results of a meta-analysis of 12 RCTs indicate that TCM intervention can improve the clinical treatment efficacy of CAG. NPAs identified seven hub TCM and 13 target genes associated with their actions, while bioinformatics analysis identified two DEGs between normal and CAG gastric tissues. Finally, molecular docking was employed to reveal the mechanism of action of the active molecules in TCM on the DEGs. These findings not only reveal the mechanisms of action of the active components of the TCMs, but also provide support for the development of new drugs, ultimately blocking the progressi

PubMed 38170849 ↗
J Am Coll Cardiol · 2022 · Meta-analysis / systematic review
Micronutrient Supplementation to Reduce Cardiovascular Risk

Conclusion: Supplementation of some but not all micronutrients may benefit cardiometabolic health. This study highlights the importance of micronutrient diversity and the balance of benefits and risks to promote and maintain cardiovascular health in diverse populations. (Antioxidant Supplementation in the Prevention and Treatment of Cardiovascular Diseases; CRD42022315165).

PubMed 36480969 ↗
Food Chem · 2025 · Meta-analysis / systematic review
Improving quercetin bioavailability: A systematic review and meta-analysis of human intervention studies

Conclusion: 3) Food matrix effects: the addition of dietary fats and fibre increased bioavailability by ∼2-fold. 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.

PubMed 40037045 ↗

Dosage people report

As stated by users — not a recommendation. Follow the label or your doctor.

500-1000 mgas reported
500 mg3x daily
1500-2000 mgdaily
1000-3000 mgdaily
500-1000 mgdaily
200-400mgas reported

Reported side effects

How often each side effect came up across all reports.

insomnia ×2overstimulation ×1reduced thyroid ×1liver injury ×1memory problems ×1dna damage ×1histamine rebound ×1jitteriness ×1

What users say

Verbatim quotes, shortened only — each links to the original discussion.

“Take Quercetin instead of antihistamines, its a natural one”
Source discussion ↗
“I'd really like to create a patch of powerful senolytics to take while I sleep.”
Source discussion ↗
“What's your opinion on other potentially anti-aging therapies like NMN & NR, NAD+ therapies, rapamycin, Dasatanib, resveratrol, and quercetin?”
Source discussion ↗
“Quercetin (500-1000mg) is another popular choice but it can cause insomnia... people have reported some short term memory problems”
Source discussion ↗
“Quercetin is sometimes brought up as an alternative, but it has the same transformation problems”
Source discussion ↗
Top discussions (5)

Other options for immunity

User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate