Daily Wellness & Absorption · Core range
Quercetin 95%
Sophora japonica · Flower bud
Quercetin dihydrate from Sophora japonica flower buds, for immune, allergy-season, and absorption formulas, with a clean yellow powder.
Reviewed October 2026 · Specification PDF ↓ · Method: HPLC →
95%
Quercetin
1 kg
Minimum order
1–7 days
Indicative lead time
1 kg foil pouch
Standard packing
Specification
What the certificate will report
| Quercetin | 95% (HPLC) |
|---|---|
| Form | Quercetin dihydrate |
| Source | Sophora japonica flower bud |
| Particle size | 80 mesh |
| Marker compounds | Quercetin, rutin |
| Appearance | Yellow to yellow-green powder |
| Solubility | Sparingly water-soluble; soluble in ethanol |
| Standard packaging | 1 kg foil pouch · 25 kg fiber drum · 5 kg carton |
| Minimum order | 1 kg |
| Indicative lead time | 1–7 days |
The method behind the marker value matters as much as the number. Read how it works, what it proves, and where it stops.
Method guide →Specifications are confirmed in writing before quotation. Lead times start after specification and packaging approval, not after the first email.
Application
Where this grade fits
- Immune capsules
- Allergy-season formulas
- Absorption blends
- Antioxidant products
Available forms
Packing options
Application guides
Dietary Supplements · Functional Food & Beverage · Beauty & Personal Care
What to confirm before ordering
- Quercetin dihydrate and anhydrous quercetin have different molecular weights. State the form on the specification.
- Quercetin is often paired with bromelain or vitamin C. Ask for blend support if the dose per capsule is constrained.
Documentation
Released with every lot
- Batch-specific certificate of analysis against the agreed specification
- Technical data sheet with source, part, carrier, and storage
- Safety data sheet in the 16-section format
- Allergen and GMO statements signed for the batch
- Origin and traceability record linking herb lot and manufacturing lot
- Halal, Kosher, or organic certificates where the grade and facility are covered
Buyer questions
Practical answers
Which specification options are available for quercetin 95%?
Quercetin: 95% (HPLC); Form: Quercetin dihydrate; Source: Sophora japonica flower bud; Particle size: 80 mesh. Other ratios, marker ranges, carriers, and mesh sizes can be quoted as a custom grade after a feasibility review.
Which documents are supplied with the batch?
A batch-specific COA, technical data sheet, SDS, allergen and GMO statements, and an origin record. Third-party heavy-metal, pesticide, or microbiological reports can be arranged, as can Halal, Kosher, or organic certificates where the grade is covered.
What is the minimum order and lead time?
1 kg minimum, packed in a 1 kg foil pouch; bulk drums are available as quantities scale. 1–7 days after specification and order confirmation. Custom specifications take longer because analytical release is part of the run.
Can we test a sample before ordering?
Yes. Samples are typically 100–500 g and are dispatched with their own COA once the specification is agreed, usually within 3–5 business days. Keep half of the sample so you can compare it with the production lot.
Related specifications
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Related reading
The questions behind this specification
How to read a botanical extract COA without being fooled
A practical line-by-line guide to the certificate of analysis: what belongs on it, which numbers actually matter, and the shortcuts that should make you ask for more.
Read the note →10:1 is not a strength: extract ratios versus standardization
What an extract ratio actually tells you, why a 10:1 powder can be weaker than a 4:1 extract, and how to write a specification that means something.
Read the note →Next step
Send the spec. We will confirm what is possible.
A competitor COA, a label claim, or a rough target is enough to start. We reply with a matched grade, documentation list, and indicative price.