Quercetin

Bedst

Antioxidant

Quercetin at a glance

  • Occurs naturally in red wine (grapes), tea, kale, tomatoes, and berries
  • Antioxidant, skin-soothing, and restorative ingredient
  • Present in St. John’s wort and Ginkgo biloba

Quercetin description

Quercetin is a bioflavinoid ingredient from plants. It occurs naturally in grapes (so it is also found in red wine), tea, onions, kale, tomatoes, berries, and many other fruits and vegetables, with the highest concentrations found in the leaves and skins. It functions as an antioxidant, skin-soothing agent, and restorative ingredient. In terms of skin care, research has shown that a lipid-based (fat-based) delivery system is optimal for quercetin to exert antioxidant benefits. Even more exciting, this type of formula provides an initial burst of quercetin followed by sustained release over a 24-hour period. When quercetin is mixed with silicone and lipids, the intake is greater, as confirmed by testing on human skin. Emerging research also shows quercetin has protective effects against ultraviolet-B (UVB) radiation, though quercetin is not approved as an active sunscreen ingredient. Higher amounts of quercetin impart a pale yellow to golden colour to cosmetics.

Quercetin references

  • Current Medicinal Chemistry, September 2019, pages 5,825-5,848
  • Frontiers in Phamacology, July 2018, page 826
  • Pharmacognosy Review, July–December 2016, pages 84–89
  • International Journal of Nanomedicine, May 2016, pages 1,987-2,007
  • International Journal of Pharmacology, January 2013, issues 1-2, pages 56-66
  • Skin Pharmacology and Physiology, 2013, issue 2, pages 57-67

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ratings af ingredienser

Bedst

Dokumenteret og understøttet af uafhængige studier. Fremragende aktiv ingrediens til de fleste hudtyper eller hudproblemer.

God

Nødvendigt for at forbedre en formulerings tekstur, stabilitet eller penetration.

Middel

Generelt ikke-irriterende, men kan have kosmetiske, stabilitetsmæssige eller andre problemer, der begrænser dets anvendelighed.

Dårlig

Der er risiko for irritation. Risikoen øges, når det kombineres med andre problematiske ingredienser.

Dårligst

Kan forårsage irritation, inflammation, tørhed osv. Kan være en fordel i nogle tilfælde, men generelt har man påvist, at ingrediensen gør mere skade end gavn.

Ukendt

Vi kunne ikke finde denne ingrediens i vores ingrediensordbog. Vi registrerer alle manglende ingredienser og foretager løbende opdateringer.

Ikke ratet

Vi har endnu ikke ratet denne ingrediens, fordi vi ikke har haft mulighed for at gennemgå forskningen om den.