Quercetin Review

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What You Should Know

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Recently the news about the advantages of the flavonol Quercetin have been making the rounds. Some studies suggest that the supplement may assist in preventing cancer, while others have looked at the benefits of Quercetin to aid in weight loss and management of diabetes. The idea that Quercetin can help you lose weight comes from the fact that it inhibits glucose absorption in the bloodstream.

Quercetin is an antioxidant and phytochemical found in the coloring of red onions and apple skins, which has been isolated and is now sold by various vitamin companies in a capsule form. This anti-inflammatory is often recommended to be used in conjunction with other supplements like bromelain or resveratrol for the best results. It is thought that at least 500mg of quercetin needs to be ingested daily, or 500g twice a day, for the supplement to have any effect at all. These tablets are sold by various brand names, such as GNC (60 caplets $14.49), Twinlab (100 capsules for $18.96), Doctor’s Best (180 capsules for $15.99), and Source Naturals (200 capsules for $42.99). FRS also sells the supplement in chewable (30 for $16.99) and powdered form (14 for $17.99). Quercetin is also included in CytoMax’s sports drink supplement, which sells for $21.49 for 24oz.

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Some capsules mix quercetin with other vitamins, like C, while the powders and sports drinks often feature a mix of supplements including quercetin.

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When taken in the right amount, and in conjunction with the right additional supplements, quercetin is thought by some to help in reducing allergies and arthritis, as well as help to prevent cancer and lose weight, however these claims are far from being absolutely proven. For instance, the American Cancer society commented on quercetin by saying it “has been promoted as being effective against a wide variety of diseases” and while “some early lab results appear promising, as of yet there is no reliable clinical evidence that quercetin can prevent or treat cancer in humans.” Furthermore the American Cancer Society’s report states that there is no conclusive proof that the amount of quercetin consumed in a balanced diet will cause any benefits, nor will it cause any major problems [1]. The evidence that quercetin actually aids in losing weight is currently slim.

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  • Quercetin is easy to add to your diet either through fruits or capsules.
  • There is no evidence that taking the suggested 1g daily of quercetin will cause any health problems or ill side effects.
  • Some studies suggest that in addition to inhibiting glucose absorption to aid in weight loss quercetin can help with allergies and arthritis due to its anti-inflammatory properties.


  • The studies linking quercetin to proven weight loss are not conclusive.
  • It is likely that several other supplements will have to be taken in conjunction with quercetin to produce the optimum results.
  • Supplements can be expensive and it is difficult to obtain the recommended amounts of quercetin through regular, healthy eating habits.


While there are no signs that ingesting up to 1 gram of quercetin daily will harm you there is little to suggest that the supplement can definitely aid in reducing your weight. It would be advisable to check with your doctor before beginning any supplement regime.

[1] American Cancer Society, http://www.cancer.org/docroot/ETO/content/ETO_5_3x_Quercetin.asp

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  • 1

    Is quercetin with bromelain a diuretic ?