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Medically reviewed by Last updated on Oct 3, 2023.

What are other common names?

  • 2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-4H-1-benzopyran-4-one
  • 3, 3′, 4′, 5, 7-pentahydroxy-2-phenylchromen-4-one
  • 3,3',4'5,7-Penthydroxyflavone
  • Bioflavonoid
  • Bioflavonoid Complex
  • Bioflavonoid Concentrate
  • Bioflavonoid Extract
  • Bioflavonoids
  • Bioflavonoïde
  • Bioflavonoïde de Citron
  • Bioflavonoïdes de Citron
  • Citrus Bioflavones
  • Citrus Bioflavonoid
  • Citrus Bioflavonoid Extract
  • Citrus Bioflavonoids
  • Citrus Flavones
  • Citrus Flavonoids
  • Complexe de Bioflavonoïde
  • Concentré de Bioflavonoïde
  • Extrait de Bioflavonoïde
  • Extrait de Bioflavonoïdes de Citron
  • Flavones de Citron
  • Flavonoid
  • Flavonoids
  • Flavonol
  • Flavonoïde
  • Meletin
  • Mélétine
  • Pentahydroxyflavone
  • Quercetin Dihydrate
  • Quercetina
  • Quercetine
  • Quercétine
  • Sophretin
  • Sophrétine
  • Vitamin P

What is this product used for?

Quercetin may help to lower blood pressure. It may also help protect against heart and blood vessel problems. Quercetin may improve the ability of some people to exercise longer.

What are the precautions when taking this product?

  • Always check with your doctor before you use a natural product. Some products may not mix well with drugs or other natural products.

  • Avoid the use of quercetin while taking digoxin.

  • Take extra care if you are taking drugs to thin your blood. These are drugs like warfarin.

  • Be sure to tell your doctor if you are pregnant, plan on getting pregnant, or are breastfeeding. You will need to talk about the benefits and risks of using this natural product.

  • Do not use this product if you are breastfeeding.

  • Take extra care and check with your doctor if you have:

    • Heart problems

    • High blood pressure

What should I watch for?

  • Upset stomach

When do I need to call the doctor?

  • Signs of a very bad reaction. These include wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat. Go to the ER right away.

Where can I learn more?

NIH Office of Dietary Supplements

Last Reviewed Date


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