Quercetin

The Polyphenol for Immunity & Inflammation

A naturally occurring flavonoid found in fruits and vegetables, clinically studied for its antioxidant capacity, anti-inflammatory, and allergy symptom reducing effects.

What is Quercetin Good For?

Quercetin is one of the most abundant flavonoids in the human diet, known for its ability to reduce inflammation and oxidative stress.

 

Quercetin supplementation may lead to:

  • Reduction in inflammation when combined with vitamin C
  • Improvements in morning stiffness and pain in Rheumatoid Arthritis patients by lowering inflammation markers
  • Reduction in systolic and diastolic blood pressure
  • Increased antioxidant capacity which can lead to reduction of oxidative stress
  • Reducing the severity of COVID-19 infection
  • Improvements in upper respiratory allergy symptoms (e.g. nasal itching, sneezing)

What is Quercetin?

Quercetin is a flavonol (a class of flavonoids) naturally present in apples, onions, berries, and tea. It works by scavenging free radicals and regulating pro-inflammatory pathways (including TNF-α).

 

Because natural dietary intake is often too low to deliver therapeutic effects, supplementation provides higher, clinically validated doses.

What is the Recommended Daily Dose of Quercetin?

Human clinical studies commonly use 500 mg per day of quercetin for immune and antioxidant support, with some studies exploring higher doses (up to 1000 mg) for reducing inflammation and allergy symptoms.

Things to Know

Source

Typically derived from plant sources such as sophora flower (Sophora japonica)

Technology

Standardised extracts; often combined with bromelain or vitamin C for enhanced absorption and synergy

Region

Widely used in Europe, Asia, and North America for immune and cardiovascular health supplements

Data

Supported by peer-reviewed human clinical studies in immunity, allergy, and inflammation

Quercetin in Detail

Clinical Dose
Clinical Dose

500 mg

Source
Source

Flavonoid extract (commonly from Sophora japonica)

Technology
Technology

Standardised for ≥95% quercetin; enhanced absorption strategies may include liposomal forms or combinations with vitamin C

Key Benefits
Key Benefits
  • Potent antioxidant and anti-inflammatory support
  • Promotes healing during viral infection
  • Reduces allergy symptoms
  • Supports cardiovascular health
  • Complements vitamin C for enhanced anti-inflammatory effects
Data
Data

Validated by multiple human clinical studies, particularly for reducing inflammation, allergy symptoms, and oxidative stress

Your Questions About Quercetin

Reach us arrow_forward
It’s a plant flavonoid with antioxidant and anti-inflammatory properties, found naturally in fruits and vegetables.
It supports immunity, protects cells from oxidative stress, promotes cardiovascular health, and helps ease allergy symptoms.
Quercetin uniquely modulates inflammatory signalling and mast cell activity, providing benefits beyond antioxidant activity.
Quercetin is safe and well tolerated at typical doses. At very high doses, mild digestive upset or headache may occur.
Yes, it works synergistically with vitamin C, zinc, and bromelain for immune and antioxidant benefits.

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References

The Science That Supports Us

Cognitive and Neurological Support

Askari G et al. (2012)The effect of quercetin supplementation on selected markers of inflammation and oxidative stress. J Res Med Sci. 2012 Jul;17(7):637-41.

Mental Health

Dehghani, F. et al. (2020) ‘Effects of quercetin supplementation on inflammatory factors and quality of life in post‐myocardial infarction patients: A double blind, placebo‐controlled, Randomized Clinical Trial’, Phytotherapy Research, 35(4), pp. 2085–2098. doi:10.1002/ptr.6955. 

Nerve Repair

Javadi, F. et al. (2016) ‘The effect of quercetin on inflammatory factors and clinical symptoms in women with rheumatoid arthritis: A double-blind, randomized controlled trial’, Journal of the American College of Nutrition, 36(1), pp. 9–15. doi:10.1080/07315724.2016.1140093. 

Immune System Support

Lai, Y.-R. et al. (2025) ‘Clinical effects of polyphenolic compounds on allergic rhinitis: A systematic review and meta-analysis’, The Journal of Allergy and Clinical Immunology: In Practice, 13(9). doi:10.1016/j.jaip.2025.06.032. 

Immune System Support

Serban, M. et al. (2016) ‘Effects of quercetin on blood pressure: A systematic review and meta‐analysis of Randomized Controlled Trials’, Journal of the American Heart Association, 5(7). doi:10.1161/jaha.115.002713.