| Botanical name | Allium cepa |
| Part used | Bulb |
| Appearance | Light tan to yellowish fine powder |
| Solubility | Water-soluble |
| Particle size | 40–80 mesh |
| Moisture content | NMT 5% |
| Heavy metals | NMT 10 ppm |
| Shelf life | 24–36 months |
| Microbial limits | Complies with USP/BP standards |
Every batch is fully documented and export-ready to international standards. COA, MSDS, and Phytosanitary Certificate included with every shipment.
Active compound verification, botanical identity, and purity testing at the source.
Monitored extraction and processing with consistent standardisation at every stage.
Heavy metals, pesticide residue, microbial safety, and active content — all verified.
COA, MSDS, Phytosanitary Certificate, and all export documents prepared before shipment.
Bulb extract standardised for quercetin at 10–30% by HPLC and total flavonoids at 20–40%, in a standard grade and a deodorised grade, with an organic grade available on request.
Quercetin by HPLC and total flavonoids. The ranges are wide, so specify the assay you need rather than accepting the range, and confirm whether your specification is written on quercetin or on total flavonoids.
Where the characteristic organosulfur odour of onion is unacceptable in the finished format. It is a distinct grade and should be specified explicitly at enquiry.
This is a botanical extract of Allium cepa bulb carrying a quercetin declaration, not a quercetin isolate. Assay and solubility both differ substantially — the extract is water-soluble while isolated quercetin is practically insoluble in water.
Allium cepa bulb, with botanical identity confirmed on the Certificate of Analysis.
Light tan to yellowish fine powder at 40–80 mesh, water-soluble. Moisture NMT 5%. Heavy metals NMT 10 ppm. Shelf life 24–36 months in sealed, cool, dry storage.
A batch-specific Certificate of Analysis covering quercetin and total flavonoid content by HPLC, heavy metals, moisture and microbial limits, plus MSDS and specification sheet.
An organic grade is available on request and quoted against buyer specification.
Against your specification and volume. Assay basis, standard versus deodorised grade and pack size all move the price.
Supplied as a bulk ingredient for further manufacture. Buyers are responsible for compliance with the regulations of their destination market. This product is not intended to diagnose, treat, cure or prevent any disease.