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Quercetin is a flavonoid found in various fruits and vegetables. It has been shown to have a number of health benefits, including reducing the risk of cancer and heart disease. Quercetin is thought to deliver its health benefits by reducing inflammation and oxidative stress

How quercetin works

Quercetin is thought to inhibit the production of histamine, which is responsible for many symptoms of allergies and asthma. Quercetin also scavenges free radicals that can damage cells and contribute to inflammation

Foods high in quercetin

Quercetin is a specific type of flavonoid found in high amounts in certain fruits and vegetables. Some of the best sources of quercetin are onions, apples, berries, broccoli and kale. However, quercetin can also be taken as a dietary supplement, either alone or in combination with other supplements such as ginger or turmeric

Side effects of quercetin

However, quercetin can also have some disadvantages. For example, quercetin can interact with medications and is therefore not suitable for everyone. Also, quercetin can cause some side effects such as nausea and diarrhoea. It is important to talk to your doctor before taking Quercetin if you are pregnant or breastfeeding, or if you have any other health problems


In conclusion, quercetin is a powerful antioxidant that can help protect the body from disease. It is found in many fruits and vegetables and can also be taken as a dietary supplement. Quercetin has been shown to be effective in treating a number of conditions, including allergies and heart disease