Quercetin 500

100% Natural

Quercetin from natural, purely herbal premium flower extract from the flowers of the Japanese cord tree (Sophora japonica) with at least 95% quercetin. Full 500 mg per capsule. Special and gentle water-ethanol extract. GMO-free, additive-free, fructose-free and vegan. 120 capsules
  • 100% natural plant-based quercetin
  • From pure flower extract of the Japanese cordwood Sophora japonica
  • At least 95% quercetin in the extract
  • Full 500 mg per capsule
  • Highly purified water-ethanol extract, without any other solvents
  • No additives and vegan
120 capsules

Delivery : 1–3 business days

Incl. VAT, excl. Shipping

€296.25 / 1kg
In stock

Premium Bioactive Ingredients

  • Pure extract from the flowers of the Japanese cord tree (Sophora japonica)
  • Pure extract standardised to min. 95% quercetin
  • 100% natural, plant-based quercetin
  • 500mg of quercetin per capsule
  • Highly purified extract using water and ethanol, without any other solvents
  • Completely vegan and free from additives



How are we different?

We use a 100% natural, purely herbal extract from the flowers of the Japanese cord tree (Sophora Japonica). This is standardized to at least 95% quercetin content and contains no synthetic quercetin, which has low bioavailability. The pure water-ethanol extraction process eliminates the use of other extraction agents, such as N-hexane or methanol.

For the capsule shells we use custom-made HPMC capsules that, unlike most other HPMC and pullulan capsules on the market, are 100% free from controversial additives such as carrageenans and PEG. We then package this product in environmentally friendly amber glass.




  • Premium active ingredients in their purest form
  • Sourced directly from the world’s best producers
  • Our select raw materials are the basis of all our formulations
  • Complete avoidance of all unnecessary additives and adjuvants
  • Exclusive use of valuable natural ingredients for additives
  • We voluntarily declare all ingredients
  • All extractions performed without the use of chemical solvents
  • Custom production when necessary, in order to achieve the highest possible level of purity
  • Independent laboratory testing available on product pages
  • Raw materials sourced only from premium suppliers who are committed to fair working conditions
  • Amber glass and compostable pouches used for packaging
  • Vegan capsule shells, free from PEG and carrageenans
  • Packaged in the EU according to HACCP, GMP and ISO 22000:2018 standards
  • Stored in non-toxic containers
  • Shipped in mineral oil-free boxes
  • All products guaranteed 100% free from magnesium stearate, silicon dioxide, nanoparticles (no legal opportunism), genetic engineering, artificial colours and flavours, titanium dioxide and added sugar & sweeteners


Bioflavonoids, a class of plant compounds which includes quercetin, are the most abundant polyphenols (aromatic compounds) in the plant kingdom. As plant pigments, they are responsible for both the colouring of flowers and leaves as well as for protecting the plants against environmental damage.

Quercetin is particularly concentrated in the outer layers of plants and fruits in order to protect them. Foods rich in quercetin include grapes, apples and onions. Removing the skins or shells of such fruits and vegetables, however, effectively strips these foods of their quercetin. The name of this potent flavonoid is derived from the Latin "quercus" (oak) due to the high concentrations of the potent flavonoid discovered in the tree's bark. However, it is not only oak trees that are rich in quercetin; the bark and outer layers of other trees also contain large quantities of this antioxidative compound.

The Japanese pagoda tree (Sophora japonica), from whose flowers we extract our 100% natural and bioavailable quercetin, contains exceptionally high amounts.


Recommended Dosage

Take 1 capsule (500mg quercetin) with 200ml water daily.

Food Supplement

Do not exceed the recommended dose. Food supplements cannot replace a balanced and varied diet. Keep out of reach of children.


Store in a cool, dry place away from direct sunlight and heat.


Ingredients: Sophora japonica Flower Extract (min. 95% quercetin).
Capsule shells: Hydroxypropyl Methylcellulose.
Contains: 120 capsules

Nutritional Information per Capsule % NRV*
Sophora japonica Extract 526mg -**
of which quercetin 500mg -**

* Nutrient Reference Value
** no NRV established

Per capsule: 526mg Sophora japonica extract, of which 500mg quercetin
Per jar: 63.12g Sophora japonica extract, of which 60g quercetin

Product Details

German Pharmaceutical Number (PZN) 16323076
Origin Brazil
Production In-house production in Europe, bottling and encapsulation in the EU according to HACCP, GMP and ISO 22000:2018 standards
Finished products packaged in amber glass jars and stored in non-toxic containers
Shipping in mineral oil-free boxes
Capsules Plant-based cellulose (HPMC). Vegan
Premium HPMC quality: Free from controversial additives such as carrageenans and PEG
Packaging Amber glass jar to protect against light and oxidation (free from plasticisers and BPA)
To Reuse Remove product label by soaking the jar in warm water for 5 minutes. Glue residue can be removed with dish soap.

Laboratory Tests

The purity of our formulas is important to us. This is why we have both our raw ingredients as well as our finished products extensively tested by independent laboratories to confirm purity and active ingredient content. Here, we have provided the results of some of the tests carried out on this product.

Sunday Natural

Our Philosophy

For thousands of years, cultures all over the world have been using medicinal plants and nutritious foods to naturally foster and maintain vitality and good health.

With our products, we try to emulate this ancient wisdom as much as possible.

Consequently, our philosophy is simple: everything we do meets the highest standards of quality and purity; our focus is on organic and natural ingredients.

We follow this philosophy with meticulous care on all levels and down to every last detail.

Learn more.

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