98% Quercetin Powder

Quercetin is a common plant secondary metabolite, chemically named 3,3′,4′,5,7-pentahydroxyflavone. It typically appears as a yellow crystalline powder that is practically insoluble in water at room temperature, but soluble in organic solvents such as ethanol and dimethyl sulfoxide (DMSO). Quercetin exhibits strong antioxidant activity, capable of stabilizing free radicals and protecting cells from oxidative damage.

Quercetin can be obtained either through extraction from plant sources or via synthetic methods. The most common method involves extraction from plants using hot ethanol, solvent extraction, or liquid–liquid partitioning techniques. Among plant sources, the bark of the Chinese parasol tree (Firmiana simplex) is frequently used, though quercetin can also be extracted from many fruits, vegetables, and medicinal herbs, including onions, apples, tea leaves, and Ginkgo biloba.

In addition to extraction, quercetin can also be chemically synthesized or biosynthesized using engineered microbial systems—approaches that are increasingly studied for scalable production.

Quercetin is generally considered a safe compound with low toxicity. However, excessive intake may lead to side effects such as gastrointestinal discomfort, nausea, and vomiting. Pregnant and breastfeeding women are advised to use quercetin with caution, and ideally under medical supervision.

Due to its anti-inflammatory, antiviral, anticancer, and cardiovascular protective properties, quercetin is widely studied in pharmacology and nutrition science, and is increasingly incorporated into dietary supplements, cosmetics, and functional foods.

• Product Name: Quercetin
• Source: Sophora Japonica Extract
• CAS Number: 117-39-5
• Appearance: Yellow Green Powder
• Purity: 95%, 98%
• Synonyms: Sophoretin, Quercetol, Natural Flavonol, Bioflavonoid Extract
• COA: Quercetin Powder COA

Highly bioactive and plant-based, Quercetin is known for free radical scavenging, histamine regulation, and immune response support, making it a top choice for both preventive and therapeutic health formulations.

Technical Specifications

Key Features

• Plant-derived quercetin flavonoid
• 95%–98% purity guaranteed by HPLC testing
• Natural antioxidant, anti-inflammatory, and antiviral support
• Ideal for use in capsules, tablets, beverages, and skincare
• Clean-label, non-GMO, gluten-free, and vegan-friendly
• Available in bulk with consistent quality

Quality & Compliance

Manufactured under GMP-compliant conditions with strict quality assurance:

• In-house and third-party testing
• Analytical control using HPLC, UV, and microbiology screening
• Fully traceable raw material sourcing from Sophora japonica
• Meets international standards:
  • USP, EP, CP
  • KOSHER, HALAL, USDA Organic, EU Organic, ISO22000, HACCP
• COA, MSDS, and TDS provided with each batch

Applications

Primary Uses

• Dietary Supplements (capsules, softgels, powders)
• Immune Health and Allergy Formulas
• Functional Foods & Beverages
• Cosmetic Antioxidant Additive
• Sports Nutrition and Recovery Blends

Specific Formulation Ideas

• Immune defense capsules (with Zinc and Vitamin C)
• Antioxidant tea powders and beverages
• Skin brightening creams or anti-aging serums
• Anti-allergy and antihistamine oral formulas

Recommended Dosage

• Oral: 250–1000 mg/day (depending on formulation)
• Topical: 0.1%–1% in skincare preparations

Ingredient Compatibility

• Vitamin C
• Zinc
• Bromelain
• Resveratrol
• Curcumin

Supply & Service

• MOQ: 1kg
• Packaging:
  • 1kg/bag/carton
  • 25kg/drum/carton
  • OEM/private label support available
• Lead Time: 5–7 business days for in-stock items
• Shipping: Global delivery by air, sea, or express
• Customization: Purity levels, granule size, and solubility tailored to client needs
• Support: Full regulatory and technical documentation provided

Company Credentials

Xi’an Best Bio-Tech Co., Ltd. specializes in the research, development, and export of natural plant extracts. Our state-of-the-art facility in Yangling, China, is GMP-compliant and serves clients in over 60 countries.

• Equipped with multiple automated production lines
• Advanced QC lab with HPLC/UV/GC/MS instrumentation
• Certified: USFDA, ISO9001, HALAL, KOSHER, EU/USDA Organic
• Extensive experience in OEM/ODM solutions

Frequently Asked Questions (FAQ)

1. What is Quercetin used for?

Quercetin is used for immune support, allergy relief, antioxidant supplementation, and anti-aging skincare.

2. Is it safe and natural?

Yes — it’s a plant-based bioflavonoid derived from Sophora japonica, with a long history of safe use.

3. How is it tested?

Each batch is HPLC-verified for purity and tested for contaminants, heavy metals, and microbes.

4. Can I get custom specifications?

Yes — we offer OEM/ODM support, custom packaging, and purity options.

5. Do you provide documentation?

Yes — COA, MSDS, TDS, and third-party lab results are available.