Description
A flavonoid-standardized extract from yellow onion skin and bulb (Allium cepa), positioned as a natural-source quercetin alternative to synthetic or Sophora japonica-sourced quercetin. Yellow onion skins are among the highest natural concentrations of quercetin among edible plant materials.
Yellow-brown to brown free-flowing powder. Limited water solubility (quercetin aglycone is hydrophobic); quercetin glycosides are more water-soluble.
We supply food-grade Onion Quercetin Extract from manufacturers in China holding ISO, Halal, Kosher and other certifications relevant to the product and production.
Common market grades include Onion Extract 5 percent Quercetin (standard supplement grade), 10 percent Quercetin (premium grade), 20 percent Quercetin (high-end concentrate), and quercetin glycoside-standardized variants where the natural conjugate form is preferred.
Bulk and reduced-MOQ shipments. Batch-level COA covering total quercetin content (HPLC), quercetin aglycone versus glycoside breakdown, total flavonoids, residual solvents, heavy metals, and microbiology.
Introduction
Quercetin is the most widely distributed flavonoid in human diets, present in onions, apples, capers, berries, tea, and many other plant foods. Yellow onion skin contains exceptional concentrations (up to 2 to 4 percent of dry weight in the outer dry skin), making onion-skin extract an attractive natural-source feedstock for quercetin supplements.
Industrial production proceeds by hydroalcoholic extraction of onion skin and outer-layer material (often a food-industry byproduct), followed by purification, decolorization, and spray-drying. Premium grades use selected raw materials and additional purification.
Recognized as a permitted food ingredient in most jurisdictions. Quercetin itself is approved for various food and supplement uses by major regulators; onion-source positioning supports clean-label claims.
Strategic positioning targets clean-label and natural-source quercetin supplements where the food-derived provenance commands a price premium over Sophora japonica-sourced material (the conventional volume supply for quercetin). Secondary applications in cardiovascular and allergy-support supplements.
Where it is used
- Cardiovascular-support and circulation-support dietary supplements
- Seasonal-allergy and immune-modulation supplements (quercetin has documented anti-allergic activity)
- Anti-aging and antioxidant supplement formulations
- Sports nutrition: anti-inflammatory and endurance-support positioning
- Premium natural-positioning quercetin supplements (versus Sophora-sourced)
- Functional beverages: immune and wellness drinks
- Cosmetic skincare: antioxidant and anti-inflammatory formulations
Technical data
| Item | Specification |
|---|---|
| Appearance | Yellow-brown to brown free-flowing powder |
| Total Quercetin (HPLC) | 5% / 10% / 20% (grade dependent) |
| Total flavonoids | typically 1.3 to 1.5 times quercetin content |
| Loss on drying | ≤ 5.0% |
| Residue on ignition | ≤ 5.0% |
| Heavy metals (as Pb) | ≤ 2 mg/kg |
| Total plate count | ≤ 1000 cfu/g |
| Source | Allium cepa outer skin and bulb |
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