Product Overview
Main Specifications: Quercetin Dihydrate 95% | Quercetin Anhydrous 95% & 98% (USP)
Quercetin Powder is a naturally derived flavonoid extract sourced from the dried buds of Sophora japonica (Japanese pagoda tree), one of the most well-established botanical sources of high-purity quercetin in the global ingredient supply chain. The finished extract presents as a green-yellow to yellow fine powder with a characteristic bitter taste, making it immediately recognizable among experienced formulators and quality control professionals.
From a solubility standpoint, quercetin powder is slightly soluble in water but dissolves readily in alkaline solvents and polar organic solvents such as ethanol. This solubility profile is an important consideration for formulators developing aqueous-based systems, encapsulated nutraceuticals, or functional food applications, as it directly influences bioavailability and formulation strategy.
Understanding Quercetin Dihydrate vs. Quercetin Anhydrous
One of the most common points of clarification for procurement teams and formulation chemists is the distinction between quercetin dihydrate and quercetin anhydrous — two commercially significant forms of quercetin powder that differ in moisture content and molecular structure.
Quercetin Dihydrate
When the industry refers to "quercetin" in general trade contexts, it most commonly denotes quercetin dihydrate. This form retains crystalline water within its molecular structure, resulting in a moisture content typically ranging from 8% to 12%. It is the more widely available form and is often the standard reference point for bulk commodity pricing and specification matching.
Quercetin Anhydrous
Quercetin anhydrous is a processed form in which the crystal water molecules have been removed through controlled drying or processing techniques. The result is a more concentrated active form with a moisture content of less than 4%. This form is particularly suitable for applications requiring tighter moisture specifications, including hard capsule filling, tablet compression, and moisture-sensitive formulation environments. Extract Makers supplies quercetin anhydrous to both 95% and 98% purity levels, with the 98% grade meeting USP (United States Pharmacopeia) standards — a critical benchmark for manufacturers targeting regulated markets in North America and beyond.
Bioactive Profile and Functional Properties
Quercetin is one of the most extensively studied flavonoids in nutritional science, and its functional versatility makes it a highly sought-after ingredient across multiple product categories. As a bioactive compound, quercetin powder exhibits a well-documented range of biological activities, including:
- Antioxidant activity — Quercetin is a potent free-radical scavenger, capable of neutralizing reactive oxygen species (ROS) and supporting cellular oxidative balance.
- Anti-inflammatory support — It is widely incorporated into formulations targeting inflammation-related wellness, working through multiple biochemical pathways.
- Antiviral and antibacterial properties — Research has highlighted quercetin's capacity to interfere with viral replication and inhibit certain bacterial strains.
- Antiallergic effects — Quercetin is known to inhibit histamine release from mast cells, making it a popular ingredient in seasonal wellness and allergy support supplements.
- Antithrombotic activity — It has demonstrated the ability to reduce platelet aggregation, contributing to cardiovascular health formulations.
- Cardiovascular and circulatory support — Quercetin powder is used in products formulated to help reduce blood pressure, manage blood lipid levels, and improve capillary resistance and microcirculation.
- Respiratory wellness — Traditional and modern applications alike have incorporated quercetin into cough-relief and respiratory support formulations.
These functional properties make quercetin an exceptionally versatile ingredient for nutraceutical manufacturers, supplement brands, functional food developers, and pharmaceutical ingredient suppliers.
Certificate of Analysis (COA) — Quercetin Anhydrous
The following represents a standard Certificate of Analysis for our Quercetin Anhydrous product, reflecting the rigorous quality testing applied to every production batch:
| Test Item | Specification | Method | Result |
|---|---|---|---|
| Appearance | Yellow Powder | Organoleptic | Conforms |
| Loss on Drying | ≤ 3.0% | HB43-S Moisture Meter | 2.80% |
| Ignition Ash | ≤ 2.0% | USP37 \<561> | 1.30% |
| Mesh Size | 98% Through 80 Mesh | Organoleptic | Conforms |
| Mercury (Hg) | ≤ 0.1 mg/kg | Atomic Absorption | Conforms |
| Lead (Pb) | ≤ 3.0 mg/kg | Atomic Absorption | Conforms |
| Arsenic (As) | ≤ 2.0 mg/kg | Atomic Absorption | Conforms |
| Cadmium (Cd) | ≤ 1.0 mg/kg | Atomic Absorption | Conforms |
| Total Plate Count | ≤ 1,000 cfu/g | USP30 \<61> | Conforms |
| Yeast & Mold | ≤ 500 cfu/g | USP30 \<61> | Conforms |
| E. coli | Negative | USP30 \<62> | Conforms |
| Salmonella | Negative | USP30 \<62> | Conforms |
| Shelf Life | 24 Months | — | No antioxidant used |
Part Used: Sophora Japonica Bud
Storage: Store in a cool, dry place, away from moisture, light, and oxygen.
Standard Packaging: Fiber drum with double inner plastic bags. Net weight: 25 kg per drum. Dimensions: I.D. 35 cm × H 51 cm.
Industry Applications
Quercetin powder's broad functional profile and high compatibility with diverse delivery formats make it applicable across a wide range of industries and product types:
Dietary Supplements & Nutraceuticals
Quercetin is a core ingredient in antioxidant blends, immune support formulas, cardiovascular health supplements, allergy relief products, and anti-aging nutraceuticals. It is commonly co-formulated with bromelain, vitamin C, zinc, or resveratrol to enhance synergistic effects and improve bioavailability.
Functional Foods & Beverages
With appropriate formulation adjustments, quercetin can be incorporated into functional food products, including fortified bars, wellness drinks, and ready-to-mix powder formats targeting health-conscious consumers.
Pharmaceutical & Cosmetic Raw Materials
Quercetin is used as an active pharmaceutical ingredient (API) precursor or functional excipient in certain regulated product categories. Its antioxidant and anti-inflammatory properties also make it relevant in topical cosmetic and dermatological formulations.
Animal Nutrition
Quercetin powder is increasingly evaluated in veterinary and animal feed supplement contexts, particularly for its antioxidant and anti-inflammatory properties in livestock and companion animal health.
Quality Standards and Certifications
Extract Makers operates under a fully certified quality management framework designed to meet the requirements of international buyers, regulatory bodies, and brand compliance teams. All quercetin powder products are manufactured in a GMP-certified facility, with the following certifications in place:
- GMP (Good Manufacturing Practice)
- HACCP
- ISO 22000
- ISO 9001
- Kosher Certified
- Halal Certified
- FDA Registered Facility
These certifications collectively demonstrate Extract Makers' commitment to product safety, traceability, and consistent manufacturing excellence — factors that are essential for importers, distributors, and brand owners operating in regulated markets across North America, Europe, and Asia-Pacific.
Packaging Options
Extract Makers offers flexible packaging configurations to accommodate a wide range of order volumes and end-use requirements:
- Small to mid-volume: 1 kg – 5 kg aluminum foil bags
- Mid-volume: 10 kg – 20 kg cartons
- Bulk volume: 10 kg – 30 kg fiber drums
Private Label & Custom Packaging
For clients who require branded packaging, Extract Makers provides a private label service, enabling you to customize bags with your company logo, product name, and design specifications. This service is particularly valuable for distributors and retailers who wish to streamline the packaging process and bring market-ready products to shelf faster, without the operational overhead of in-house repacking.
Shipping and Logistics
Extract Makers supports international shipping through multiple logistics channels to ensure reliable, cost-effective delivery regardless of order size or destination:
- Express courier (below 1 ton): DHL, FedEx, UPS, EMS, and other major express services
- Bulk freight: Rail and sea freight options are available for larger commercial orders where applicable
All shipments are accompanied by complete documentation, including COA, MSDS, and any required customs declaration materials to facilitate smooth import clearance.
Free Sample Availability
We understand that quality verification is a prerequisite for any procurement decision. Extract Makers offers complimentary samples of 10g–20g for qualified buyers to evaluate product quality, conduct internal testing, and confirm specification alignment before placing a bulk order. For high-value or specialized grades, sample availability will be confirmed upon inquiry.
After-Sales Support and Quality Guarantee
Our quercetin powder carries a 24-month shelf life from the date of manufacture, backed by Extract Makers' product quality guarantee for the full duration of that period. In the event that a delivered product does not meet the agreed specifications, we operate a hassle-free return and refund policy — refunds are processed based on the quantity of product returned, ensuring fair resolution for all parties.
Our customer service team is available to assist with technical inquiries, formulation guidance, regulatory documentation requests, and order follow-up at any stage of the procurement process.
Request a Quote or Free Sample
To request a free sample of Quercetin Powder, discuss bulk pricing, or obtain full technical documentation, please contact our team directly:
📧 Email: [email protected]
Extract Makers maintains a product portfolio of more than 2,000 botanical extracts, plant-derived ingredients, and nutritional raw materials. If you are sourcing a specific ingredient that is not listed on our website, please reach out directly — our team can assist with custom sourcing, specification matching, and private-label development to meet your exact requirements.
