Ingredient
Quercetin
The Polyphenol for Immunity & Inflammation
A naturally occurring flavonoid found in apples, onions, berries, and tea, 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.
Potential benefits of supplementation
- 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.
Recommended Daily Dose
500 mg
Human clinical studies commonly use 500 mg per day for immune and antioxidant support, with some studies exploring higher doses (up to 1000 mg) for reducing inflammation and allergy symptoms.
Quercetin in Detail
- Clinical Dose
- 500 mg
- Source
- Flavonoid extract (commonly from Sophora japonica)
- Technology
- Standardised for ≥95% quercetin; may use liposomal forms or combinations with vitamin C
- Key Benefits
- Potent antioxidant and anti-inflammatory support
- Promotes healing during viral infection (including COVID-19)
- Reduces allergy symptoms (nasal itching, sneezing)
- Supports cardiovascular health (reduces blood pressure)
- Complements vitamin C for enhanced anti-inflammatory effects
- Data
- Validated by multiple human clinical studies, particularly for reducing inflammation, allergy symptoms, and oxidative stress.
Supports
Your Questions About Quercetin
What is Quercetin?
It's a plant flavonoid with antioxidant and anti-inflammatory properties, found naturally in fruits and vegetables.
What are the benefits of Quercetin?
It supports immunity, protects cells from oxidative stress, promotes cardiovascular health, and helps ease allergy symptoms.
How is Quercetin different from other antioxidants?
Quercetin uniquely modulates inflammatory signalling and mast cell activity, providing benefits beyond antioxidant activity.
Are there any side effects?
Quercetin is safe and well tolerated at typical doses. At very high doses, mild digestive upset or headache may occur.
Can Quercetin be combined with other nutrients?
Yes, it works synergistically with vitamin C, zinc, and bromelain for immune and antioxidant benefits.
The Science That Supports Us
- 1Askari, G. et al. (2012). The effect of quercetin supplementation on selected markers of inflammation and oxidative stress. Journal of Research in Medical Sciences, 17(7), pp. 637–641.
- 2Dehghani, F. et al. (2020). Effects of quercetin supplementation on inflammatory factors and quality of life in post-myocardial infarction patients. Phytotherapy Research, 35(4), pp. 2085–2098.
- 3Javadi, F. et al. (2016). The effect of quercetin on inflammatory factors and clinical symptoms in women with rheumatoid arthritis. Journal of the American College of Nutrition, 36(1), pp. 9–15.
- 4Lai, 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).
- 5Serban, 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).
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