Fruits and vegetables are rich in quercetin and it is one of the most frequently studied flavonoids. It is found in fruits, vegetables, nuts and seeds as well as in some animal products such as fish, meat, eggs, poultry, fish oil and milk. Quercetsin is a flavouring, more specifically a “flavonol,” and is found in many different foods, from fruits and nuts to vegetables and meat. Sources: 6

As a result, some studies attribute flavonoids in foods that contain them to other compounds. Quercetin is a good source of antioxidants and anti-inflammatory substances and has anti-inflammatory effects on humans, animals, plants and other animals for many years. Sources: 0, 6

One study suggested that the increased antioxidant effects measured after apple consumption could result from fructose. The subjects who consumed fructose at a level similar to that of apples also showed an increasing antioxidant capacity in the plasma. The researchers therefore suspect that this antioxidant effect is due to increased levels of the antioxidant flavonoid quercetin and not to fructose itself. Sources: 0

Ultimately, further human research is needed to understand the absorption and supplementation of these foods. Certain studies suggest that quercetin is more bioavailable in onions, for example, than in apples, and that eating antioxidants from the heart – healthy fats can also improve absorption. Of course, not all studies indicate a direct link between the antioxidant effect of QuERCETin and apple consumption. The counterargument arises primarily from the comparison of low-absorption flavonoids with other antioxidants in foods, such as antioxidants in fruits and vegetables. Sources: 0, 4

Ansari says: “There is now a strong case for using quERCETin as an antioxidant to treat heart disease and diabetes. Sources: 4

Preliminary indications suggest that quercetin may reduce the symptoms of prostatitis (inflammation of the prostate). A small study found that men who took QuERCETin had fewer symptoms than men who took a placebo. There is evidence that people with rheumatoid arthritis who switch from a typical Western diet to a diet high in querbic acid and other antioxidants, such as a diet rich in fruits and vegetables, show few or no symptoms. Sources: 1

There is no evidence that these positive effects are directly attributable to antioxidants or that quercetin preparations help in the treatment of RA. Certain chemotherapy drugs can even affect the antioxidant properties, such as certain anti-inflammatory drugs. Sources: 1, 4

Of course, it would make sense that dietary supplements usually contain concentrated amounts of the substance when trying to ingest it. In fact, research has found that quercetin in whole foods is biologically better available to the body than in the capsule variant. The amount that is found in plant-based foods can vary greatly depending on where they are grown, how freshly they are baked or prepared and other factors such as the amount of salt in them. Without the right balance of nutrients, your body will struggle to absorb it properly. Sources: 3, 4

Quercetin belongs to a group of water-soluble, vegetable-coloured substances called bioflavonoids. The most common types of dietary supplements include quercets such as fiber, vitamins and minerals as well as some vitamins, minerals and amino acids. Some QuERCETin dietary supplements are also labelled with crosssheaths or dihydrates, most of which are insoluble in water and cannot be absorbed. Sources: 2, 3

Bioflavonoids have a strong antioxidant effect when tested in a test tube, but there is no basis for the health claims attached to them. Sources: 2

This is because patients with RA who eat a typical Western diet experienced recurrent symptoms. However, there is growing evidence of a link between the use of quercin and the development of RA and a number of other diseases. It is considered a substance that is not vital, but can help promote optimal healthSources: 2, 3

Quercetin is often added to sports supplements because it is believed to help increase athletic performance and endurance. Although the improvements over time are small, it makes sense that the antioxidant can increase physical performance by helping to enlarge the blood vessels that supply oxygen and nutrients to muscles, joints, and tissues. Sources: 3

Quercetin may contain carcinogenic properties that can help prevent the spread of cancer cells and tumour growth. Fruits and vegetables are full of flavonoids and research has shown that a diet high in flavonoids such as quercetsin can prevent cancer. Increased intake of these foods can reduce the risk of many cancers. Sources: 7

Isoquercitrine-rich foods include fruits, vegetables, nuts, seeds, legumes, fruits and nuts, and seeds and berries. Sources: 5

The amount of quercetin ingested through food depends primarily on the dietary habits of the individual. It is also important to note that quercETin levels in food are reflected in body weight, body mass index (BMI) and blood pressure. Sources: 5

This explains why many experts recommend regular consumption of foods containing quercetin, such as fruits, vegetables, nuts, seeds, legumes and nuts and seeds. Sources: 3

Quercetin belongs to a group of plant pigments called flavonoids, which give colour to many fruits, flowers and vegetables. The pigments of these plants are blamed for many of the nutrients contained in the nutrient – packaged fruits and vegetables. QuercETin is a type of “flavonoid” antioxidant found on plant foods such as leafy vegetables like tomatoes, berries and broccoli. 

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