CompoAtlas

Quercétine in food supplements

956 supplements declared in France contain Quercétine as a substance or active ingredient.

Compl'Alim declarations. Compl'Alim, food supplement declarations (France), retrieved 23 October 2026.

What we know about this ingredient

Uses

  • Dietary supplement

  • Free-radical inhibiting antioxidant useful in cosmetics intended to protect the product from oxidative damage from UV radiation or singlet oxygen formation ... Use levels are normally about 0.1% and rarely exceed 0.2%.

  • Medicine, reported formation of epoxy resins on mixing with epichlorohydrin

  • Quercetin has been used in ... dyes and as a veterinary drug.

PubChem : Hazardous Substances Data Bank (HSDB) · 2026-10-29 · American Cancer Society; Making Treatment Decisions: Complementary & Alternative Therapies: Diet and Nutrition: Quercetin. Available from, as of March 18, 2008: https://www.cancer.org/docroot/ETO/ETO_5.asp?sitearea=ETO; Rieger MM; Kirk-Othmer Encyclopedia of Chemical Technology. (2001). NY, NY: John Wiley & Sons; Cosmetics. Online Posting Date: Dec 4, 2000.; Lewis, R.J. Sr.; Hawley's Condensed Chemical Dictionary 14th Edition. John Wiley & Sons, Inc. New York, NY 2001., p. 945; IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work)..

Licence.

A molecule found naturally in plants or organisms; in a supplement it may be extracted from them, made by fermentation or synthesised: the declaration does not say which.

Basis: one CosIngThe European Commission's database of cosmetic ingredients. CAS and natural occurrence recorded in Wikidata (LOTUS database).

Wikidata: names of substances in six languages and taxa in which they occur (largely from the LOTUS database), retrieved 23 October 2026.

Natural occurrence recorded in Wikidata (LOTUS database): 1747 taxa; examples: Ilex quercetorum, Hydrangea quercifolia, Quercus suber, Quercus dentata, Rhododendron abietifolium.

Wikidata: names of substances in six languages and taxa in which they occur (largely from the LOTUS database), retrieved 23 October 2026.

Manufacturing

  • /Isolation from/ bark of fir trees, also synthetically

  • Isolation from Rhododendron cinnabarinum Hook, Ericaceae

  • Quercetin ... has been obtained for use as a natural coloring agent (Natural Yellow 10) by the rapid extraction of powdered quercitron bark with dilute ammonia and boiling of the extract with sulphuric acid ... The first successful synthesis of quercetin was reported in 1962 ... in which treatment of 2-methoxyacetyl phloroglucinol with O-benzylvanillic acid anhydride in triethylamine and then with potassium hydroxide produced 5,7-dihydroxy-4'-benzyloxy-3,3'- dimethexyflavone. The benzyl ether was cleaved with acetic acid-hydrochloric acid, and the methyl ethers were then cleaved with hydriodic acid to produce quercetin.

PubChem : Hazardous Substances Data Bank (HSDB) · 2026-10-29 · Crop Protection Handbook 2004. (Formerly Farm and Chemicals Handbook) Willoughby, OH: Meister Publishing Co., 2004., p. 945; O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 2006., p. 1381; IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work)..

Licence.

Appearance

  • Yellow needles (dilute alcohol, +2 water)

  • Quercetin appears as yellow needles or yellow powder. Converts to anhydrous form at 203-207 °F. Alcoholic solutions taste very bitter. (NTP, 1992)

PubChem : Hazardous Substances Data Bank (HSDB) · 2026-10-29 · Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V2: 1570.

Licence.

PubChem : CAMEO Chemicals · 2026-10-29 · National Toxicology Program, Institute of Environmental Health Sciences, National Institutes of Health (NTP). 1992. National Toxicology Program Chemical Repository Database. Research Triangle Park, North Carolina..

Licence.

Associated research

ClinicalTrials.gov · A trial is not proof: it tests a hypothesis.

Searched on 1 November 2026.

Other names: quercetina (Spanish), quercetina (Italian), quercetina (Portuguese).

Wikidata: names of substances in six languages and taxa in which they occur (largely from the LOTUS database), retrieved 23 October 2026.

Same substance in cosmetics: QUERCETIN.

In plain words

À quoi il sert, selon les fabricants

Objectifs les plus souvent annoncés pour les compléments qui en contiennent (Quercétine) : immunité (195 produits), antioxydant (143 produits), circulation sanguine et lymphatique (64 produits), voies respiratoires (59 produits), œil / vision (52 produits).

Ce sont les objectifs déclarés par les fabricants à l'administration, pas des effets démontrés. Sur l'emballage, seules les allégations de santé autorisées par l'Union peuvent être écrites.

Compl'Alim, food supplement declarations (France), retrieved 23 October 2026.

What the registers say, country by country

Each line repeats what an official register says on the date it was consulted. Not being in a register means neither allowed nor banned.

Health claims register (European Union): 0 authorised and 4 refused claim(s) for this substance.

EU Register of nutrition and health claims, retrieved 21 October 2026.

Compl'Alim ingredient list (France): listed.

Compl'Alim, reference list of ingredients, retrieved 21 October 2026.

Canada, licensed natural health products (LNHPD): 31 products.

Licensed Natural Health Products Database (LNHPD), Health Canada: licensed products, ingredients, doses, uses and risks, retrieved 27 October 2026.

Contains information licensed under the Open Government Licence – Canada (Health Canada, LNHPD)

Licence du gouvernement ouvert – Canada 2.0 (OGL-Canada 2.0)

United States, supplement labels (DSLD; supplements need no prior approval): 1957 products.

Dietary Supplement Label Database (DSLD), US National Institutes of Health: current and off-market labels, retrieved 27 October 2026.

Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (CC0); US market labels.

Declared daily quantities

Declared daily quantities: Quercétine
UnitProductsMedianMinimumMaximum
mg29710001,800

Calculated from Compl'Alim declarations that provide a quantity. These are quantities declared by manufacturers, not measurements, and preparation is not distinguished (powder, extract of varying concentration): differences between products can be very large.

Official warnings (Health Canada)

QUERCETIN

Route of administration: Oral

Cautions and warnings

Applies to products providing 40 milligrams or more Quercetin, per day.

Ask a health care practitioner/health care provider/health care professional/doctor/physician before use if you are pregnant or breastfeeding.

Health Canada monograph dated 30 January 2026

Texts from the monograph of Health Canada, the Canadian authority, reproduced without modification. They do not replace medical advice.

Products