Quercetin belongs to the large family of flavonoids, compounds naturally found in certain coloured fruits, vegetables and plants — notably apples, red onion, dark berries and blackcurrant. However, dietary intake alone generally does not achieve an optimal level of active quercetin in the body, which is why concentrated supplementation is of interest. Extraction from Sophora japonica flowers produces a highly concentrated quercetin in anhydrous form. Unlike standard hydrated forms, which contain around 15% water in their structure, the anhydrous version corresponds to 100% active quercetin, offering a pure intake that maximises the molecule’s potential in the body.

The exclusive use of water and food-grade ethanol to extract the molecule guarantees the total absence of toxic residues or hard-to-eliminate solvents. Purity consistently exceeds 98% according to HPLC chromatographic analysis, ensuring maximum safety. Hand-harvesting the Sophora japonica flowers preserves the integrity of the active molecules and avoids degradation during processing. The formula strictly excludes any addition of excipients, GMOs, nanoparticles and known major allergens. The capsules are 100% plant-based (pullulan), suiting all diets, including vegan and gluten-free.

These two forms do not offer the same potential. Dihydrate quercetin, more economical, contains at least 15% water in its molecular structure. For an identical labelled dosage, the actual quercetin intake is therefore noticeably lower: about 85% quercetin per gram versus 98-100% for the anhydrous form. This distinction places the anhydrous form’s real dosage among the most effective on the market. At 500 mg per capsule, the active quercetin intake is nearly complete, unlike a same-dosage dihydrate capsule which only provides about 425 mg of actual quercetin.

The recommended dose is 2 capsules per day (1,000 mg), split into two doses with meals to improve intestinal absorption. It is possible to start with one capsule a day and adjust the dose based on individual tolerance. Store the bottle in a cool, dry place, away from light, to guarantee product stability over time.

Not recommended for pregnant or breastfeeding women without medical advice. If on medication, consult a healthcare professional before supplementing. Keep out of reach of young children.

How does anhydrous quercetin really differ from dihydrate?

The main distinction is the actual active ingredient content. Dihydrate quercetin contains around 15% water in its molecular structure, reducing the actual amount of quercetin absorbed at an equal dose. The anhydrous form represents almost 100% pure quercetin, a real intake of 98-100% per gram versus about 85% for the dihydrate form.

Are there allergens or additives in this quercetin?

This quercetin is formulated with no additives, preservatives, colourings or common allergens. It contains no gluten, dairy or soy. The vegetable pullulan capsule suits vegan customers.

How can I optimise the intake of anhydrous quercetin?

The ideal approach is to split the daily dose into two intakes, taken with meals. This method favours better intestinal absorption thanks to food-driven enzymatic stimulation.

Herba Barona is an independent specialist supplement shop in the heart of Paris — established in 2006. What you order is genuinely on our shelves: we ship from our own stock, with no dropshipping and no long waits.

Visit us at 10 rue Théophile Roussel, Paris 12 — or use Click & Collect and pick up your order in-store. We also deliver across France and Europe. Friendly, expert advice in English from our team.

Where is the shop?

Herba Barona is at 10 rue Théophile Roussel, 75012 Paris — a two-minute walk from Ledru-Rollin (line 8), close to Bastille. Open Tuesday to Saturday, 9:30 am–6:30 pm.

Can I order online or collect in store?

Yes. We ship across France and Europe under the same conditions as our French store, or choose Click & Collect to pick up your order for free at our Paris shop.