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What is quercetin?
Quercetin is a plant pigment (flavonoid). It is found in many plants and foods, such as red wine, onions, green tea, apples, berries, Ginkgo biloba, St. John's wort, American elder, and others. Buckwheat tea has a large amount of quercetin. People use quercetin as a medicine.
https://www.webmd.com/vitamins/ai/ingredientmono-294/quercetin
A made-in-Canada solution to the coronavirus outbreak?
The best hope for an antiviral drug may come from Michel Chrétien's Montreal lab
Fifteen years ago, Chrétien and Mbikay, researchers at the Clinical Research Institute of Montreal (IRCM), began testing their idea that a derivative of quercetin, a plant compound known to help lower cholesterol and treat inflammatory disease—and common, at low doses, in over-the-counter medication—was a “broad spectrum” antiviral drug that could fight a range of viruses.
February 24, 2020
https://www.macleans.ca/news/canada/a-made-in-canada-solution-to-the-coronavirus-outbreak/