Allergies Home > Quercetin Supplement Information

Quercetin is a flavonoid found in various plants. It is also used in dietary supplements that are claimed to be useful for a variety of different purposes, such as treating allergies or preventing heart disease. The flavonoid seems to work as an antioxidant and may also have anti-inflammatory effects. It may also inhibit the growth and division of certain cells (including cancer cells) and may have anti-estrogen effects.
Although research in laboratory animals or cells shows promise for quercetin's effectiveness, it is important to know that there is not much evidence in humans to suggest that this flavonoid really works for most uses. For many adults, short-term use of quercetin seems to be fairly safe when used in moderation. However, some people may be more likely to experience problems. Therefore, you should talk with your healthcare provider prior to taking quercetin medicinally if you have:
  • Kidney disease, such as kidney failure (renal failure)
  • Any chronic or severe medical condition
  • Any allergies, including allergies to foods, dyes, or preservatives.
(Click Quercetin for more information on quercetin supplements, including how they work, what they are typically used for, and what side effects may occur.)
Written by/reviewed by:
Last reviewed by: Arthur Schoenstadt, MD
Last updated/reviewed:
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