Updated: 2026-09-07. This is a procurement guide, not a market forecast, research review or supplier test report.
Start with the beverage, not the highest assay
Write down whether the brief needs tea flavor, a clear appearance or a defined catechin composition. A highly concentrated powder may bring astringency or haze that a lower-assay flavor-focused material does not. A green tea extract is not a substitute for validating the finished beverage.
Compare like-for-like analytical data
Ask for separate EGCG, total catechins, caffeine and total polyphenol methods. Record dry-basis versus as-is reporting and carrier content. Do not compare a colorimetric total with an HPLC marker result as though they describe the same thing.
Design a useful pilot
Compare candidate lots in the actual acid and water system, with and without the proposed sweetener. Measure clarity, sediment, color, astringency and caffeine; track catechin retention after heat processing and storage. Include oxygen, minerals, light and packaging. If ginseng is proposed, evaluate its identity and bitterness independently before combining.
Keep the label separate from the ingredient assay
An EGCG value is not evidence of sustained energy. Have a qualified reviewer assess concentrated tea extract eligibility, caffeine exposure, intended users and warnings. Base nutrition and any claims on the complete finished product, not a supplier description.
Questions to include in your RFQ
Send destination market, intended format, processing conditions, ingredient exclusions and sample needs. Ask for a current specification, batch-specific COA, full composition and risk-based contaminant testing. Specifications and availability are indicative until confirmed in writing; agree acceptance criteria and change-control terms before purchase.
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