Quercetin
| INCI Name | Quercetin |
|---|---|
| Category | Antioxidant |
| Skin Types | All, especially sensitive and blemish-prone skin |
| Typical Concentration | 0.1% - 2% |
| Property | Rating |
|---|---|
| Antioxidant effect | ⭐⭐⭐⭐⭐ |
| Anti-inflammatory | ⭐⭐⭐⭐⭐ |
| Soothing | ⭐⭐⭐⭐⭐ |
| UV Protection | ⭐⭐⭐⭐ |
| Tolerance | ⭐⭐⭐⭐⭐ |
Quercetin combines strong antioxidant power with gentle skin soothing, making it an ideal ingredient for sensitive skin types. As a natural plant protective agent, it offers effective protection against environmental damage while reducing inflammation.
What is Quercetin?
Quercetin belongs to the group of flavonoids, a class of naturally occurring plant compounds known for their powerful antioxidant properties. In nature, quercetin is found in many plants such as onions, apples, berries, and green tea, where it acts as a natural protective substance against UV radiation and oxidative stress.
In cosmetics, quercetin is mainly produced synthetically to ensure consistent quality and purity. The active ingredient is characterized by its ability to neutralize free radicals and inhibit inflammatory processes in the skin. These properties make it particularly valuable for treating sensitive and irritated skin.
Korean cosmetic manufacturers often use quercetin in combination with other soothing active ingredients like Centella Asiatica or Niacinamide to achieve synergistic effects. The yellow-greenish coloration of pure quercetin is usually not visible in the finished products as it is used in low concentrations.
How Quercetin works on your skin
Antioxidant Protective Effect
Quercetin is considered one of the strongest natural antioxidants. Studies show that it is more effective than vitamin C in neutralizing certain free radicals (Boots et al., Journal of Nutrition, 2008). This antioxidant power protects skin cells from premature aging and maintains the natural skin barrier.
Anti-inflammatory Properties
The anti-inflammatory effect of quercetin is based on the inhibition of various inflammatory mediators. Research shows that quercetin reduces the release of histamine and other inflammatory substances (Mlcek et al., Molecules, 2016). This makes it particularly valuable for treating redness, irritation, and inflammatory skin problems.
UV Protection and Photoaging Prevention
Quercetin offers natural protection against UV-induced skin damage. Studies show that it reduces the formation of UV-induced DNA damage and stimulates collagen synthesis (Casagrande et al., Journal of Photochemistry and Photobiology, 2006). Although it does not replace sunscreen, it enhances the protective effect of sunscreens.
Improvement of the Skin Barrier
Quercetin strengthens the natural skin barrier by promoting ceramide production and stabilizing cell membranes. A study by Halenar et al. (2015) showed that quercetin improves skin hydration and reduces transepidermal water loss.
Anti-Aging Effects
By inhibiting enzymes that break down collagen and elastin, quercetin helps maintain skin firmness. Research shows that it reduces the activity of matrix metalloproteinases (MMPs), which are responsible for the breakdown of the extracellular matrix (Zheng et al., Food & Function, 2017).
Who is Quercetin suitable for?
| Skin Type | Suitability | Benefits |
|---|---|---|
| Sensitive Skin | ⭐⭐⭐⭐⭐ | Soothing, reduction of redness |
| Blemish-prone skin | ⭐⭐⭐⭐⭐ | Anti-inflammatory, promotes healing |
| Mature Skin | ⭐⭐⭐⭐ | Anti-aging, collagen protection |
| Normal Skin | ⭐⭐⭐⭐ | Preventive protection, antioxidation |
| Dry Skin | ⭐⭐⭐ | Barrier strengthening, moisture retention |
| Oily Skin | ⭐⭐⭐ | Antioxidant protection, light texture |
Integration into your K-Beauty Routine
Application time: Quercetin can be used both morning and evening. In the morning, it provides antioxidant protection for the day, and in the evening, it supports nocturnal skin regeneration.
Routine Position: Quercetin-containing products are used differently depending on the formulation. Cleansing products with quercetin are the first step; serums and treatments come after cleansing and before moisturizing. Spot treatments can be applied specifically to affected skin areas.
Combination Rules: Quercetin can be excellently combined with other soothing active ingredients such as Centella Asiatica, Niacinamide, or Hyaluronic Acid. The combination with Vitamin C enhances the antioxidant effect. When used with active ingredients like Retinol or AHA/BHA, these should be applied at different times.
The Best K-Beauty Products with Quercetin
Anua Heartleaf Quercetinol Pore Deep Cleansing Foam - 150 ml (EUR 17.20) from Anua combines quercetin with Heartleaf extract for a gentle yet thorough cleanse. The foam removes impurities without drying out the skin and leaves it feeling soothed.
Yadah Anti-T Zero Spot Cream - 15 ml (EUR 36.90) from Yadah is a highly concentrated spot treatment that combines quercetin with other anti-inflammatory ingredients. Ideal for targeted treatment of blemishes and skin inflammations.
Abib Gummy Sheet Mask Heartleaf Sticker - 27 ml (EUR 3.90) from Abib offers an intensive care experience with quercetin and Heartleaf. The innovative Gummy texture ensures optimal ingredient delivery and intense soothing.
Yadah Anti Trouble Red Zero Spot Cream - 15 ml (EUR 16.90) from Yadah is specially developed for reddened and inflamed skin areas. The formula with quercetin reduces redness and promotes healing.
Quercetin vs. Other Antioxidants
| Ingredient | Antioxidant Power | Anti-inflammatory | Tolerance |
|---|---|---|---|
| Quercetin | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Vitamin C | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ |
| Vitamin E | ⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐ |
| Green Tea | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
Myths and Facts about Quercetin
Myth: Quercetin stains the skin yellow. Fact: At typical cosmetic concentrations, quercetin does not cause skin discoloration. The yellowish color of the pure active ingredient is not visible in the finished products.
Myth: Quercetin only works for sensitive skin. Fact: Although quercetin is particularly valued for sensitive skin, all skin types benefit from its antioxidant and protective properties.
Myth: Natural quercetin from plant extracts is better than synthetic. Fact: Synthetic quercetin is identical to the natural molecule and often purer, as it is free from potentially irritating accompanying substances.
Frequently Asked Questions about Quercetin
Can I use quercetin daily? Yes, quercetin is very well tolerated and can be used daily, both morning and evening.
Is quercetin safe for pregnant women? Quercetin in cosmetic concentrations is considered safe, but if in doubt, a doctor should be consulted.
How long does it take for quercetin to work? For acute irritations, soothing effects can be noticeable after just a few applications; antioxidant protective effects develop over weeks.
Can quercetin cause allergies? Allergic reactions to quercetin are very rare, but caution should be exercised with known flavonoid allergies.
Does quercetin enhance the effect of Vitamin C? Yes, the combination of both antioxidants can achieve synergistic effects and enhance protection against free radicals.
Is quercetin photostable? Quercetin is relatively photostable, but products should still be stored away from light to maintain optimal effectiveness.
Can I combine quercetin with retinol? The combination is possible, but both active ingredients should be applied at different times to avoid irritation.
Does quercetin work against hyperpigmentation? Quercetin can contribute to the prevention of new pigment spots due to its antioxidant properties, but it is not a targeted brightening agent.