Quercetin is a flavonoid. Such compounds are found in plants. Usually it is a pigment from red or brown parts of plants. Flavonoids are usually antioxidants. That is, they can be useful.
Sport
Quercetin is loved by athletes. It is believed that it can increase their endurance during prolonged physical activity (longer than 100 minutes). Then they recover faster from it, and muscles hurt less.
Cancer
This would all be very good, but for this you need to eat much more quercetin than we usually eat it with vegetables. Some studies seem to have noticed that quercetin can provoke the development of malignant estrogen-dependent tumors. Not very nice.
There is also an opinion that quercetin can damage the kidneys.
On the other hand, quercetin reduced the risk of thrombosis in people with pre-existing malignant neoplasms. Like, such patients have nothing to lose ...
Allergic rhinitis
Here is another story. Quercetin can theoretically stabilize mast cell membranes. You and I touched on these mast cells in the urticaria story. They are able to throw out various inflammatory substances that aggravate allergic rhinitis.
So a spray with quercetin could hold back this business. This approach worked in one small study, so far-reaching conclusions were not made yet, but a positive impression remained.
This is all the more interesting, because allergic rhinitis itself comes from different plants. It seems that such a remedy will be regarded with suspicion for a long time to come.
Briefly speaking
Somewhere quercetin works, but it has not yet been sufficiently studied as a separate agent. There is no question of any biocomplexes with vitamin C.
There are alarming references to cancer and kidney damage.
Is it affordable?
