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As with most dietary supplements, quercetin is claimed to work for a variety of different uses. Does it really work, though? Quercetin is often claimed to work for conditions such as:
- Allergies
- Asthma
- Cancer (including both cancer treatment and prevention)
- Cataracts
- Chronic fatigue syndrome
- Chronic prostatitis (inflammation of the prostate)
- Diabetes
- Gout
- Hardening of the arteries (atherosclerosis)
- Heart disease
- High cholesterol
- Infections
- Intestinal or stomach ulcers
- Schizophrenia.
There is no strong scientific evidence that the product really works for most of the uses listed in this article. Although there are plenty of studies demonstrating possible benefits using laboratory animals or cells, little research has been done in humans.
One study suggests that taking quercetin orally may decrease pain associated with chronic prostatitis not associated with a bacterial infection. Short-term studies suggest that taking quercetin does not seem to improve cholesterol levels, although longer studies would be necessary to confirm this finding.
One study suggests that a diet rich in flavonoids (such as quercetin) might reduce the risk of death from heart disease, at least in elderly men. However, this does not necessarily mean that taking quercetin supplements will provide the same benefit.
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