Quercetin for Respiratory Health
Quercetin has plausible antiviral and mast-cell stabilising activity with weak human evidence.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 500-1000mg/day, ideally with bromelain or in a phytosome form
- Expected timeframe
- 4-12 weeks
Protocol
- form
- Bioavailability-enhanced quercetin
- duration
- Trials ran 2-12 weeks
- co factor
- Evidence is insufficient. The rationale is reasonable - quercetin stabilises mast cells, reduces airway inflammatory mediators in vitro and improved outcomes in animal models of asthma and lung injury - and a widely cited trial in ultramarathon runners found reduced upper respiratory infection incidence after extreme exertion. That finding has not translated: subsequent trials in general and community populations have shown inconsistent or absent effects, trials in asthma are small and inconclusive, and the COVID-19 trials that generated considerable attention were small, poorly controlled and do not support the conclusions drawn from them. No adequately powered trial has shown improvement in lung function, asthma control or respiratory infection outcomes in a general population.
- titration
- Not applicable - no dose has reliably improved respiratory outcomes
- starting dose
- Not established. Trials used 500-1,000 mg/day in divided doses with food
Evidence
What the studies say
No studies are yet linked to both Quercetin and Respiratory Health.
Safety
Caveats
Poor absorption in standard forms. Interacts with some antibiotics and ciclosporin.
Less likely to help if
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Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.