Cover image: Fisetin Powder supplied by Guanjie Biotech.

Answer first: Guanjie Biotech supplies Fisetin powder as a nutraceutical ingredient in 50% and 98% specifications, tested by HPLC, with a yellow powder appearance. The material is extracted from the dried trunk of Sumac, is soluble in ethanol, acetone, and acetic acid, and is almost insoluble in water. For B2B buyers, the sourcing decision is not only the assay number. It is the combination of specification, solubility fit, certification coverage, batch COA, MOQ, and lead time.

This guide is written for supplement manufacturers, importers, brand owners, and procurement teams in the Research to Evaluation stage. It focuses on the constraints that determine whether Fisetin powder can move from a sample request to a repeat commercial order: documented assay, tested method, certificate scope, batch-level quality records, and supply terms.

Problem Definition: Why Fisetin Powder Sourcing Needs a Constraint-First Review

Fisetin powder is a plant-derived nutraceutical ingredient extracted from the dried trunk of Sumac. In commercial sourcing, the main problem is not finding a supplier that lists the ingredient. The problem is confirming which specification is being offered, how it is tested, and whether the supplier can support the target dosage form and destination market with the right documents.

A product page may list Fisetin powder at 50% and 98% specifications with HPLC as the test method and a yellow powder appearance. That is a useful starting point, but it is not a complete purchase specification. Buyers still need to confirm the exact assay on the batch COA, the test method, the botanical source, and the solubility profile. Fisetin powder is described as almost insoluble in water but soluble in ethanol, acetone, and acetic acid. That single property affects how the ingredient is handled in capsules, tablets, powders, beverages, and cosmetic applications.

Certification is another common gap. A supplier may state that it holds ISO, HACCP, HALAL, and Kosher certificates, but the buyer must check whether Fisetin powder is included in the certificate scope and whether the certificate is still valid at the time of order. Certificate numbers, issuing bodies, issue dates, expiry dates, and product lists matter because they determine whether the document can support a supplier qualification file.

Batch COA and supply terms are the third constraint. A buyer evaluating Fisetin powder for the first time needs to know whether each shipment includes a complete Certificate of Analysis, whether third-party re-testing can be supported, what the minimum order quantity is, and how long production and delivery take. These points are more decision-relevant than a general statement that a supplier is experienced.

Industry Background: Nutraceutical Ingredients Under Quality and Compliance Pressure

Nutraceutical ingredients sit inside a quality-sensitive supply chain. Global Market Insights estimates the global nutraceutical ingredients market at USD 105.8 billion in 2026. That scale reflects demand across dietary supplements, functional foods, beverages, and personal care. It also explains why buyers are asked to compare suppliers on documentation, not only on price.

In the United States, the FDA states that dietary supplement manufacturers, packagers, and holders must follow current good manufacturing practices intended to help ensure identity, purity, quality, strength, and composition. The FDA also describes a new dietary ingredient notification process for ingredients intended for the U.S. market, unless an applicable exception applies. These requirements do not automatically classify every botanical ingredient in the same way. Ingredient-specific legal status and market-entry requirements must be checked separately.

For Fisetin powder, this means a supplier evaluation should include manufacturing controls, batch testing, certificate coverage, and regulatory documentation. A buyer should not assume that a certificate for one product automatically covers every grade. The supplier should be able to show the certificate scope and the product list, and should provide a COA for the specific Fisetin powder lot being offered.

The market also rewards suppliers that can connect ingredient specifications to real formulation needs. Fisetin powder is not a generic free-flowing water-soluble powder. Its solubility profile is part of the technical brief. A capsule or tablet application may have different requirements from a ready-to-drink beverage or a cosmetic emulsion. The supplier should be able to discuss the grade, the test method, and the documentation package in the context of the intended use.

Detailed Solution: Guanjie Biotech Fisetin Powder Specification and Supply Support

Guanjie Biotech is a Shaanxi-based manufacturer founded in 2004, supplying high-purity natural plant extracts, premium fruit powders, and specialized chemical raw materials to the pharmaceutical, health care, functional food, and cosmetics industries. The company operates a 7,000 m² facility that includes a 2,000 m² cGMP-standard clean workshop and a 500 m² laboratory. The company reports 40 employees, 7 engineers, an annual output of 500 tons, a 90% export ratio, and more than 16 national patents. Its export markets include Europe, North America, South America, Asia, and the Middle East.

Natural Fisetin Powder. Buyers should confirm the exact assay and batch COA for the selected grade.

The Fisetin powder offered by Guanjie Biotech is identified by CAS No. 528-48-3. The product specification lists 50% and 98% assay options, HPLC as the test method, and a yellow powder appearance. The material is extracted from the dried trunk of Sumac. It is soluble in ethanol, acetone, and acetic acid, and almost insoluble in water. These facts should be treated as the starting specification, not as a substitute for the final COA and technical data sheet.

The quality system is supported by ISO 9001:2015 certification, HACCP system certification, HALAL certification, and Kosher certification. The ISO 9001:2015 certificate is numbered 00123Q310086R0S/6100 and was issued by CHINA QUALITY CERTIFICATION CENTRE (CQC), with an issue date of 2023-12-07 and an expiry date of 2026-12-06. The HACCP certificate is numbered 001HACCP2301048 and was issued by China Quality Certification Centre (CQC), with an issue date of 2023-12-06 and an expiry date of 2026-12-05. The HALAL certificate is numbered 0811240000 and was issued by SHANDONG HALAL CERTIFICATION SERVICE (SHC), with an issue date of 2024-11-08 and an expiry date of 2027-11-07. The Kosher certificate is numbered K-88898568 and was issued by Badatz Shatz (SKS), with an issue date of 2026-07-15 and an expiry date of 2027-07-15.

Fisetin powder is included in the product lists associated with these certificates in the supplied documentation. The Kosher certificate explicitly lists Fisetin powder among the covered products. The ISO 9001:2015 and HACCP certificates describe an export trade scope for plant extracts, solid beverages, and food additives. Buyers should read the certificate scope and confirm that the specific Fisetin powder grade, packaging format, and destination market are covered.

Supply support includes OEM/ODM packaging customization, a minimum order quantity of 1 kg, a lead time of 30 days, and a monthly capacity of 30 tons. Quality control is described as 100% testing. Every shipment includes a complete Certificate of Analysis matching pre-shipment standard specifications, including purity, moisture, heavy metals, microbial limits, and active ingredients. If quality discrepancies arise on arrival, Guanjie Biotech supports third-party re-testing with laboratories such as SGS and Eurofins to resolve technical audits and verify product specifications.

Step-by-Step Breakdown: How to Evaluate Fisetin Powder Before Purchase

A structured evaluation reduces the risk of buying the wrong grade or accepting a certificate that does not cover the product. The following steps are designed for buyers in the Research and Evaluation stage.

Step 1: Define the assay and test method

Start with the target assay. Fisetin powder is listed at 50% and 98% specifications, with HPLC as the test method. Ask the supplier to confirm the exact assay for the quoted grade and to provide a specification sheet. If the quotation or product description refers to a broader assay range, require the batch COA to state the actual result and the method used.

Step 2: Match solubility to the dosage form

Fisetin powder is almost insoluble in water but soluble in ethanol, acetone, and acetic acid. This is a formulation constraint, not a minor detail. Capsules and tablets may have different handling requirements from beverages, powder mixes, or cosmetic emulsions. Ask the supplier whether the selected grade is appropriate for the intended matrix and whether any processing guidance is available. The supplier should be able to discuss formulation troubleshooting, including solubility and dispersion issues.

Step 3: Verify certification scope and validity

Check the certificate numbers, issuing bodies, issue dates, expiry dates, and product lists. Confirm that Fisetin powder is included in the scope. Do not rely on a general statement that the supplier is ISO, HACCP, HALAL, or Kosher certified. The document should connect to the product being purchased. Because the supplied ISO 9001:2015 and HACCP certificates expire in December 2026, buyers should confirm current validity at the time of order and request renewal evidence if the purchase extends beyond the expiry date.

Step 4: Request a batch COA and third-party testing support

A batch COA is the minimum quality record for release. The supplier states that every shipment includes a complete COA matching pre-shipment standard specifications. Ask for a sample COA for the selected Fisetin powder grade. If the destination market or internal quality system requires independent verification, ask whether third-party re-testing can be arranged with SGS, Eurofins, or another approved laboratory.

Step 5: Confirm MOQ, lead time, and capacity

The stated MOQ is 1 kg, the lead time is 30 days, and the monthly capacity is 30 tons. These figures should be confirmed against the selected assay, packaging format, and order quantity. For a first evaluation, a 1 kg order can support sample testing. For repeat production, the buyer should confirm capacity allocation and delivery schedule before committing to a launch date.

Step 6: Review packaging and OEM/ODM options

Guanjie Biotech offers OEM/ODM packaging customization. Buyers should confirm the packaging format, label requirements, and any documentation needed for the destination market. Packaging should protect the powder from moisture and light. The supplier should also provide storage guidance. The application guidance for nutraceutical ingredients recommends storing in a cool, dry, and dark place, sealing tightly after opening, and avoiding high temperature and moisture.

Step 7: Sample, validate, and scale

Use the sample to validate identity, assay, appearance, solubility, and processing behavior in the intended formulation. Compare the sample COA with the specification sheet. Only after the sample and documentation are approved should the buyer move to a commercial order. This sequence reduces the risk of a late-stage formulation failure or a documentation gap.

Use Cases: Where Fisetin Powder Fits in Nutraceutical Formulations

Fisetin powder is intended for the dietary supplement, health food, beverage, and cosmetics industries. Within those industries, the application fit depends on the dosage form and the supplier's documentation support.

• Dietary supplements and hard capsules: Fisetin powder can be used as a raw material in capsule and tablet formulations. The 50% and 98% assay options allow buyers to match the dose and analytical target. The batch COA and HPLC test method support specification review.
• Functional and fortified beverages: Because Fisetin powder is almost insoluble in water, beverage applications require formulation review. The buyer should evaluate dispersion, suspension, or solubilization options and confirm the grade with the supplier before scale-up.
• Functional foods and confectionery: Fisetin powder can be considered for functional food formats where the ingredient can be uniformly distributed. Processing temperature, moisture, and matrix interactions should be tested at the sample stage.
• Nutricosmetics and personal care: Fisetin powder is soluble in ethanol, acetone, and acetic acid, which may be relevant for certain cosmetic or personal care formulations. The buyer should confirm the grade and documentation requirements for the target market.

Factory testing supports batch COA review and 100% testing for nutraceutical ingredient orders.

Comparison Table: Fisetin Powder 50% vs 98% and Supply Terms

The table below summarises the verified specification and supply facts that matter when comparing Fisetin powder options. It is not a price comparison. Quotation should be requested against the selected assay, packaging, and destination.

Plant extraction production line at Guanjie Biotech.

FAQ: Fisetin Powder Compliance, Capability, Budget, Sample, and Lead Time

Conclusion: A Fisetin Powder Supplier Decision Built on Documents, Not Claims

Fisetin powder is a focused nutraceutical ingredient with clear specification constraints. The buyer needs the 50% or 98% assay, HPLC test method, yellow powder appearance, Sumac source, and solubility profile to be documented. The supplier needs to show certificate coverage, batch COA practice, third-party testing support, MOQ, lead time, and packaging capability. Guanjie Biotech presents these elements through its Fisetin powder specification, ISO 9001:2015, HACCP, HALAL, and Kosher documentation, 2,000 m² cGMP-standard clean workshop, 500 m² laboratory, 100% testing, 1 kg MOQ, 30-day lead time, and 30-ton monthly capacity.

For buyers in Research and Evaluation, the next step is a documented sample and quotation request. Confirm the exact grade, the certificate scope, the batch COA, and the formulation fit before committing to a launch. This approach turns a generic ingredient inquiry into a repeatable supplier qualification decision.

Factory warehouse supporting export orders and lead-time planning.