Quercetin from Sophora japonica – high-dose natural flavonoid in a vegan capsule

Optiolex Quercetin 500 delivers 500 mg of quercetin from Sophora japonica per daily serving – gelatine-free, gluten-free and free from unnecessary additives, manufactured according to GMP guidelines.

Quercetin is a naturally occurring flavonoid from the polyphenol class and is among the most extensively studied secondary plant compounds in nutrition science.

500 mg Quercetin 60 Capsules 100% vegan Sophora japonica 500 mg Quercetin Per daily serving (1 capsule) – standardised concentration. Natural Flavonoid Quercetin belongs to the flavonol subclass of polyphenols. Sophora japonica Quercetin extracted from the Japanese pagoda tree – natural plant source. 100% Vegan HPMC capsule shell (hydroxypropyl methylcellulose) instead of gelatine. GMP-Compliant Manufactured in accordance with Good Manufacturing Practice (GMP) guidelines.

Quercetin (from the Latin quercus, meaning oak) is a flavonol from the large polyphenol family of flavonoids. It occurs as a secondary plant compound in a wide range of fruits and vegetables – particularly high natural concentrations are found in onions, capers, apples, broccoli and grapes. The quercetin used in Optiolex Quercetin 500 is extracted from the flower buds of Sophora japonica (Japanese pagoda tree), a plant native to East Asia and one of the richest natural botanical sources of quercetin available.

From a chemical perspective, quercetin has a flavone backbone (2-phenylchromen-4-one) with several phenolic hydroxyl groups. It is precisely this structure that is responsible for the antioxidant chemical properties of the molecule: quercetin can act as an electron donor and belongs to the class of compounds that scavenge free radicals in analytical in-vitro assays. Together with other polyphenols such as resveratrol and rutin, quercetin is one of the most extensively studied plant flavonols in nutritional biochemistry.

Each capsule of Optiolex Quercetin 500 contains only quercetin (Sophora japonica), rice flour and rice starch as carriers, and a capsule shell made from hydroxypropyl methylcellulose (HPMC) – no animal-derived ingredients, no unnecessary fillers. The capsule is entirely vegan and suitable for those who prefer plant-based supplement formats.

If you are interested in other products from the Optiolex range, viterna.at also offers Optiolex Omega-3 Capsules, the Optiolex Vitamin B Complex and Optiolex Magnesium 7 – all GMP-compliant food supplements distributed by Alexander Eigl (Optiolex).

Recommended Intake

Take 1 capsule once daily, whole, with sufficient water.

Composition	Per daily serving (1 capsule)	%NRV*
Quercetin	500.0 mg	**

* Percentage of Nutrient Reference Values (NRV) per Regulation (EU) No 1169/2011.
** No NRV established.
Ingredients: Quercetin (Sophora japonica), rice flour, rice starch, coating agent: hydroxypropyl methylcellulose (capsule shell).
Net content: 60 capsules · e 51.9 g GMP-certified manufacturing Distributed by Alexander Eigl HPMC capsule shell (vegan) What is quercetin from a chemical perspective?

Quercetin is a flavonol – a subclass of the flavonoids, which in turn belong to the broader group of polyphenols. Its molecular formula is C₁₅H₁₀O₇. The characteristic phenolic hydroxyl groups in the molecule make quercetin one of the most intensively researched natural compounds in the biochemistry of secondary plant metabolites.

Why is quercetin so often sourced from Sophora japonica?

Sophora japonica (Japanese pagoda tree) is among the richest natural botanical sources of quercetin. The unripe flower buds of the tree contain exceptionally high concentrations of this flavonol – significantly more than typical fruit or vegetable sources. This makes it possible to extract quercetin efficiently and at a standardised concentration from this plant material.

Mandatory notices: Food supplement. Do not exceed the recommended daily intake. Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.

Storage: Store tightly closed, cool, dry and protected from light. Keep out of reach of young children.

Best before: See base of packaging. Lot No.: see base.

Frequently Asked Questions

• What is quercetin and where does it occur naturally? + Quercetin is a naturally occurring flavonoid (polyphenol) produced as a secondary metabolite in many plants. Particularly high levels are found in onions, capers, apples, kale and broccoli. In Optiolex Quercetin 500 it is sourced from Sophora japonica (Japanese pagoda tree).
• Is Optiolex Quercetin 500 genuinely vegan? + Yes. The capsule shell is made from hydroxypropyl methylcellulose (HPMC) – a purely plant-derived material that replaces traditional gelatine capsules. All other ingredients (rice flour, rice starch, quercetin from Sophora japonica) are also of plant origin. The product is labelled vegan.
• What is the recommended intake? + The manufacturer recommends taking 1 capsule once daily, whole, with sufficient water. Do not exceed the recommended daily intake.
• What else is in the capsule? + Alongside 500 mg quercetin (Sophora japonica), the capsule contains rice flour and rice starch as carriers and an HPMC capsule shell. That is all – no additional additives, no colorants, no flavourings.
• What other Optiolex products are available at viterna.at? + At viterna.at you will also find Optiolex Vitamin B Complex, Optiolex Omega-3 Capsules and Optiolex Magnesium 7.

Distributor / Responsible Person (GPSR, EU 2023/988):
Alexander Eigl · Hauptstraße 20a · 8502 Lannach · Austria · [email protected] · Tel. +43 660 810 8018