Answer:
Quercetin is a yellow flavonoid that occurs in small amounts in foods like capers, onions, and kale. It also naturally occurs in plants, like
Ginkgo biloba,
St. John's wort, and
sea buckthorn.
As discussed in more detail in our
Quercetin Supplements Review (which includes our
Top Picks), preliminary evidence suggests that quercetin may be helpful to men with prostatitis, which is why it is added as an ingredient in some
prostate supplements, although these combinations have typically not been clinically tested. It may also have modest benefit in rheumatoid arthritis, and one small clinical study found that quercetin helped improve word-recall memory when taken with
resveratrol.
Although quercetin is commonly promoted for a wide range of other uses - including allergies, asthma and cardiovascular disease - the evidence supporting these uses is limited.
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