Fisetin · Buyer guide
Fisetin 98% powder specification: purchasing checklist
A fisetin 98% powder specification needs more than the number in the product name. Ask what the assay measures, how it is reported, and what else is in the article. Treat 98% as the supplier’s stated specification until appropriate evidence supports the offered lot.
By CleanIngredients · Updated 2026-11-15
Free inquiry, reviewed by CleanIngredients. Availability is not guaranteed.
| Item | Specification | Buyer check |
|---|---|---|
| Assay | Named analyte, method, units, and basis | Lot-specific result and specification limit |
| Composition | Other components and processing aids | Full technical disclosure for review |
| Performance | Particle size and application behavior | Trial under your manufacturing conditions |
Clarify exactly what 98% means
Ask whether the result is an assay by mass, chromatographic area, or another stated basis. Those descriptions should not be silently treated as equivalent. Have your quality team compare the method and reporting convention with your required specification before accepting the grade or using the number in a cost calculation.
Request the specification revision, sample lot, manufacturing date, and matching COA. Record both the acceptance criterion and actual result. A generic example certificate can show the supplier’s reporting format, but it does not establish what is in the sample you received. Keep example and lot-specific documents clearly labeled.
Include origin and physical characteristics
If your brief requires plant-extracted fisetin, request botanical species, plant part, and process evidence. High purity alone does not distinguish plant extraction from synthetic production. Request growing-origin documentation separately from evidence for the Chinese manufacturing site, with the connection to the offered commercial grade made explicit.
Discuss particle size, handling, appearance, and dispersion in the intended formulation with your manufacturer. An application claim should include the conditions under which it was demonstrated. Ask for composition details before assuming that a dispersible preparation is the same article as an unformulated powder with the same headline ingredient name.
Make the quote usable
State the evaluation quantity and potential order quantity separately. Ask for packaging sizes, currency, freight terms, destination, lead time, and quotation expiry. Include the documents you need before payment and the criteria that will decide whether the evaluation is successful. Do not compare a sample price with a production-volume quote without noting the difference.
The cost-per-active-gram calculator can help normalize prices only after the assays are meaningfully comparable. It does not decide identity, purity, legal suitability, or health effects. For shipping and testing costs, enter your actual assumptions in the landed-cost calculator rather than assuming that the ex-works ingredient price is the final acquisition cost.
If no confirmed offering appears in the directory, use a sourcing inquiry to describe the specification. The inquiry is free and comes to CleanIngredients for review. It is not a supplier commitment and does not mean the requested 98% plant-extracted grade has been verified or is available.
Before requesting a quote
- Meaning of 98% and assay basis
- Actual lot result and specification revision
- Plant-extraction evidence if required
- Physical characteristics and full composition
- Comparable quote quantity and delivery terms
Evidence and editorial scope
Botanical and process distinctions come from the Fisetin source review. The document requests and comparison workflow are CleanIngredients’ editorial purchasing guidance. They do not establish supplier approval, product safety, or regulatory suitability. Read the directory methodology.