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Question: Is quercetin helpful for a specific condition? I see it as an ingredient in several different types of supplements.
Answer: Quercetin is a flavonoid that occurs in small amounts in foods like apples, onions, and grapefruit and in drinks like black tea and red wine. It also naturally occurs in plants, like Ginkgo biloba, St. John's wort, and sea buckthorn.
As discussed in more detail in the Quercetin article in the encyclopedia on our website, preliminary evidence suggests that quercetin may be helpful to men with prostatitis, which why it is added as an ingredient in some prostate supplements, although these combinations have typically not been clinically tested.
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. As noted above, more about this is found in the Encyclopedia article about Quercetin.