quercetin

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Occurrence

  • widely distributed in plants, especially rinds & barks, clover blossoms & ragweed pollen
  • in red onions, higher concentrations of quercetin occur in the outermost rings & in the part closest to the root[2]
  • quercetin glycosides are normal dietary constituents
    • quercetin itself is not
  • quercetin is found in tomatoes, kale, apples, & tea[5]

Indications

no confirmation of specific therapeutic for any condition

  • not approved by any regulatory agency
  • European Food Safety Authority evaluated possible health claims associated with consumption of quercetin, finding that no cause-&-effect relationship has been established for any physiological effect[3]

uses[4]

Dosage

Adverse effects

Drug interactions

Mechanism of action

More general terms

Component of

References

  1. 1.0 1.1 Merck Index, I2th ed, Merck & Co, Rahway NJ, 1996 # 8216
  2. 2.0 2.1 Wikipedia: Quercitin http://en.wikipedia.org/wiki/Quercetin
  3. 3.0 3.1 EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) Scientific Opinion on the substantiation of health claims related to quercetin and protection of DNA, proteins and lipids from oxidative damage (ID 1647), "cardiovascular system" (ID 1844), "mental state and performance" (ID 1845), and "liver, kidneys" (ID 1846) pursuant to Article 13(1) of Regulation (EC) No 1924/2006. EFSA Journal 2011;9(4):2067[15 pp.] http://www.efsa.europa.eu/en/efsajournal/pub/2067.htm
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 University of Maryland Medical Center http://umm.edu/health/medical/altmed/supplement/quercetin
  5. 5.0 5.1 George J Flavonols Linked to Slower Cognitive Decline. Memory scores better in older adults who ate more flavonol-rich fruits and vegetables. MedPage Today November 23, 2022 https://www.medpagetoday.com/neurology/dementia/101921
    Holland TM, Agarwal P, Wang Y et al Association of Dietary Intake of Flavonols With Changes in Global Cognition and Several Cognitive Abilities. Neurology. November 22, 2022 PMID: https://www.ncbi.nlm.nih.gov/pubmed/36414424 https://n.neurology.org/content/early/2022/11/22/WNL.0000000000201541

Database