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Premium Natural Plant Extract Isoquercitrin CAS: 21637-25-2. High Purity: 95%. ISO Certified Quality: Manufactured under ISO certification with HPLC assay method verification. Flexible MOQ: Low minimum order quantity of 1kg available for testing and small batches. Fast Lead Time: Average production lead time within 15 workdays for both peak and off-season. COA Available: Certificate of Analysis provided to ensure product quality and purity.