Quercetin is a bioflavonoid ingredient which occurs naturally in fruits and vegetables such as kale, tomatoes, berries and grapes, as well as some leaves and grains. It helps to give plants their vibrant colours. Quercetin occurs also naturally in red wine, tea, 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. Quercetin is present in some herbal ingredients, too, including St. John’s wort and Ginkgo biloba.
In terms of skincare, research has shown that a lipid-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.
In skincare, quercetin is believed to be skin-soothing and anti-inflammatory, with a restorative effect. Because flavonoids have antioxidant functions, quercetin is also often included in products targeted towards fighting free radicals that can damage the skin. quercetin certainly does have powerful antioxidant and anti-inflammatory benefits. If you’re in the market for a new magic makeup must-have or have have trouble with skin inflammation and irritation, there are plenty of products that offer quercetin as their signature ingredient. If you want to go Greek, Korres makes a Quercetin and Oak Anti-Ageing Night Cream . If you have easily irritated skin, Smashbox Camera Ready Full Cover Foundation, also uses quercetin. Meanwhile, if you’re worried about free radicals and age spots, try Laura Mercier Flawless Skin Tone Perfecting Creme .
Quercetin is not used widely, but can be found in skincare from toners to creams. Try Ren Flash Defence Anti-Pollution Mist, Paula’s Choice Resist Advanced Replenishing Toner or Korres Quercetin and Oak Anti-Ageing Night Cream .
A study by skincare brand Korres claimed that the use of quercetin derived from oak bark had an overall excellent performance in boosting proteasome activity and cell regeneration when tested in vitro. It is also believed to have anti-ageing benefits due to the antioxidant functions, preventing free-radical damage and promoting the growth of new cells.