{"id":31744,"date":"2026-07-07T16:02:36","date_gmt":"2026-07-07T08:02:36","guid":{"rendered":"https:\/\/www.greenherbnutra.com\/?post_type=product&#038;p=31744"},"modified":"2026-07-07T16:02:36","modified_gmt":"2026-07-07T08:02:36","slug":"quercetin-powder","status":"publish","type":"product","link":"https:\/\/www.greenherbnutra.com\/ar\/product\/quercetin-powder\/","title":{"rendered":"Quercetin Powder"},"content":{"rendered":"<h2>Reliable Quercetin Powder Manufacturer &amp; Bulk Supplier<\/h2>\n<div class=\"ybc-p\">Greenherb operates a dedicated flavonoid extraction line for Quercetin Powder. We source <em>Sophora japonica<\/em>flower buds from contracted orchards, applying short-steam enzyme inactivation and sub-50\u00b0C ethanol extraction to protect native quercetin from enzymatic and thermal degradation. Recrystallization steps push assay to 95%\/98% (HPLC, USP-aligned). Full export documentation and third-party testing ship with every batch.<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-31749 aligncenter\" src=\"https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154637_329.png\" alt=\"sophora japonica dried flower buds raw material for quercetin powder extraction\" width=\"586\" height=\"391\" srcset=\"https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154637_329.png 724w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154637_329-400x267.png 400w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154637_329-18x12.png 18w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154637_329-430x287.png 430w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154637_329-700x467.png 700w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154637_329-150x100.png 150w\" sizes=\"auto, (max-width: 586px) 100vw, 586px\" \/><\/div>\n<hr \/>\n<h2>Why Choose Greenherb Quercetin Powder<\/h2>\n<div class=\"ybc-p\">\u25cf Bud-Exclusive Sourcing \u2013 Unlike onion- or apple-derived material with &lt;0.1% native quercetin, <em>Sophora<\/em>buds deliver stable high-baseline actives, making our pure quercetin powder\u200b (98%) viable without excessive solvent cycling.<\/div>\n<div class=\"ybc-p\">\u25cf Recrystallization Over Crude Extract \u2013 Many suppliers stop at resin-purified quercetin extract\u200b (mixed flavonoids: quercetin + rutin + kaempferol). We run an extra recrystallization pass to isolate single-marker quercetin, cutting residual rutin to &lt;1%.<\/div>\n<div class=\"ybc-p\">\u25cf Enzyme-Inactivation Pretreatment \u2013 Steam-blanching buds within 4h of harvest stops endogenous enzymes that break down quercetin, a step most bulk vendors skip.<\/div>\n<div class=\"ybc-p\">\u25cf USP-NF Alignment \u2013 98% grade tested against USP monograph (HPLC, impurity profile), suited for brands positioning <strong>best quercetin powder<\/strong>\u200b claims with verifiable compliance.<\/div>\n<div class=\"ybc-p\">\u25cf Light-Sensitive Handling \u2013 98% crystalline grade vacuum-packed in amber barrier bags, nitrogen-flushed drums to prevent oxidative yellowing during storage.<\/div>\n<div class=\"ybc-p\">\u25cf Heavy Metal &amp; Pesticide Screening \u2013 Multi-point ICP-MS and GC-MS per EU\/US food-grade thresholds.<\/div>\n<div class=\"ybc-p\">\u25cf Mesh &amp; Carrier Flexibility \u2013 Default 80 mesh; carrier-adjusted grades (maltodextrin\/silica) available for capsule flow or drink-mix dispersibility.<\/div>\n<div class=\"ybc-p\">\u25cf Direct Bulk Pricing \u2013 Transparent quotes for quercetin powder bulk\u200b from 25kg trial to full FCL, no distributor layer.<\/div>\n<hr \/>\n<h2>Certificate of Analysis<\/h2>\n<table class=\"table\" border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr class=\"firstRow\">\n<td><strong>Assay<\/strong><\/td>\n<td><strong>Specification<\/strong><\/td>\n<td><strong>Test result<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Quercetin<\/td>\n<td>98%<\/td>\n<td>98.4% UV<\/td>\n<\/tr>\n<tr>\n<td><strong>Physical Control<\/strong><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>Appearance<\/td>\n<td>Yellow Fine Powder<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td><a name=\"OLE_LINK27\"><\/a><a name=\"OLE_LINK26\"><\/a>Odor<\/td>\n<td>Characteristic<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>Taste<\/td>\n<td>Characteristic<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>Part Used<\/td>\n<td>Flower Bud<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>Identification<\/td>\n<td>Positive<\/td>\n<td>Conforms(TLC)<\/td>\n<\/tr>\n<tr>\n<td>Loss on Drying<\/td>\n<td>\u22645.0%<\/td>\n<td>1.3%<\/td>\n<\/tr>\n<tr>\n<td>Ash<\/td>\n<td>\u22645.0%<\/td>\n<td>1.4%<\/td>\n<\/tr>\n<tr>\n<td>Particle size<\/td>\n<td>100% pass 80 mesh<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td><strong>Chemical Control<\/strong><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>Heavy Metals<\/td>\n<td>NMT10ppm<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>Lead(Pb)<\/td>\n<td>NMT2ppm<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>Arsenic (As)<\/td>\n<td>NMT2ppm<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>Mercury(Hg)<\/td>\n<td>NMT1ppm<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>Cadmium(Cd)<\/td>\n<td>NMT1ppm<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>GMO Status<\/td>\n<td>GMO Free<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td><strong>Microbiological Control<\/strong><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>Total Plate Count<\/td>\n<td>1,000cfu\/g Max<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>Yeast &amp; Mold<\/td>\n<td>100cfu\/g Max<\/td>\n<td>Conforms<\/td>\n<\/tr>\n<tr>\n<td>E.Coli<\/td>\n<td>Negative<\/td>\n<td>Negative<\/td>\n<\/tr>\n<tr>\n<td>Salmonella<\/td>\n<td>Negative<\/td>\n<td>Negative<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>Product Introduction<\/h2>\n<div class=\"ybc-p\">Quercetin Powder is a single-marker flavonol ingredient isolated from <em>Sophora japonica<\/em>flower buds. It differs from broad-spectrum <em>Sophora<\/em>total flavonoid extract (which carries quercetin + rutin + kaempferol in unstandardized ratios): this product locks quercetin as the sole primary marker via recrystallization, delivering batch-consistent assay for formulators who need a defined flavonol load rather than a mixed botanical matrix. Two commercial grades run: 95% for blended immune SKUs and 98% for premium single-ingredient capsules.<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-31750 aligncenter\" src=\"https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154720_829.png\" alt=\"fresh pure quercetin powder\" width=\"468\" height=\"312\" srcset=\"https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154720_829.png 782w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154720_829-400x266.png 400w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154720_829-768x512.png 768w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154720_829-18x12.png 18w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154720_829-430x286.png 430w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154720_829-700x466.png 700w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154720_829-150x100.png 150w\" sizes=\"auto, (max-width: 468px) 100vw, 468px\" \/><\/div>\n<hr \/>\n<h2>Production Process<\/h2>\n<div class=\"ybc-p\">Greenherb follows a quercetin-specific workflow:<\/div>\n<ol class=\"ybc-ol-component ybc-ol-component_1\">\n<li class=\"ybc-li-component ybc-li-component_ol\">\n<div class=\"ybc-p\"><strong>Bud Harvest &amp; Enzymatic Kill<\/strong>\u200b \u2013 <em>Sophora<\/em>buds picked at full plumpness, steam-blanched &lt;4h post-harvest to deactivate quercetinase.<\/div>\n<\/li>\n<li class=\"ybc-li-component ybc-li-component_ol\">\n<div class=\"ybc-p\"><strong>Low-Temp Drying<\/strong>\u200b \u2013 Belt drying &lt;45\u00b0C, then uniform grinding.<\/div>\n<\/li>\n<li class=\"ybc-li-component ybc-li-component_ol\">\n<div class=\"ybc-p\"><strong>Ethanol Extraction<\/strong>\u200b \u2013 Sub-50\u00b0C ethanol pulls quercetin and companion flavonoids.<\/div>\n<\/li>\n<li class=\"ybc-li-component ybc-li-component_ol\">\n<div class=\"ybc-p\"><strong>Resin Purification<\/strong>\u200b \u2013 Macroporous resin strips rutin and pigments, concentrating quercetin fraction.<\/div>\n<\/li>\n<li class=\"ybc-li-component ybc-li-component_ol\">\n<div class=\"ybc-p\"><strong>Recrystallization<\/strong>\u200b \u2013 Solvent-based crystal purge pushes assay to 98%, residue rutin &lt;1%.<\/div>\n<\/li>\n<li class=\"ybc-li-component ybc-li-component_ol\">\n<div class=\"ybc-p\"><strong>Vacuum Drying<\/strong>\u200b \u2013 Low-heat drying preserves crystalline structure.<\/div>\n<\/li>\n<li class=\"ybc-li-component ybc-li-component_ol\">\n<div class=\"ybc-p\"><strong>QC Release<\/strong>\u200b \u2013 HPLC (USP method) for quercetin assay, impurity check, heavy metals, pesticides, microbiology per batch.<\/div>\n<\/li>\n<li class=\"ybc-li-component ybc-li-component_ol\">\n<div class=\"ybc-p\"><strong>Protective Packaging<\/strong>\u200b \u2013 98% grade vacuum-sealed in amber PE + desiccant, nitrogen-flushed fiber drums; 95% grade in standard light-shielded drums.<\/div>\n<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-31751 aligncenter\" src=\"https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154859_320.png\" alt=\"cold ethanol extraction and recrystallization process flow for quercetin\u200b\" width=\"845\" height=\"414\" srcset=\"https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154859_320.png 845w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154859_320-400x196.png 400w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154859_320-768x376.png 768w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154859_320-18x9.png 18w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154859_320-430x211.png 430w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154859_320-700x343.png 700w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_154859_320-150x73.png 150w\" sizes=\"auto, (max-width: 845px) 100vw, 845px\" \/><\/p>\n<hr \/>\n<h2>Functional Properties &amp; Benefits<\/h2>\n<div class=\"ybc-p\">\u25cf Single-Marker Consistency \u2013 No lot-to-lot drift from mixed flavonoid loads; assay locked on quercetin via HPLC.<\/div>\n<div class=\"ybc-p\">\u25cf Antioxidant Anchor \u2013 Frequently paired with vitamin C, rutin, or bromelain in synergistic immune\/inflammatory-support blends.<\/div>\n<div class=\"ybc-p\">\u25cf Formulation Versatility \u2013 95% grade for cost-sensitive blends, 98% crystalline for premium SKUs requiring label claim precision.<\/div>\n<div class=\"ybc-p\">\u25cf Stability Engineered \u2013 Low moisture + nitrogen + amber packaging supports 24-month shelf for 98% grade.<\/div>\n<hr \/>\n<h2>Applications<\/h2>\n<div class=\"ybc-p\"><strong>Immune &amp; Seasonal Wellness<\/strong><\/div>\n<div class=\"ybc-p\">Capsule\/tablet fill for quercetin-only or quercetin+vitamin C\/rutin blended SKUs.<\/div>\n<div class=\"ybc-p\"><strong>Sports Recovery<\/strong><\/div>\n<div class=\"ybc-p\">98% grade for post-exercise oxidative-stress formulations, often combined with bromelain or omega-3 carriers.<\/div>\n<div class=\"ybc-p\"><strong>Functional Food &amp; Beverage<\/strong><\/div>\n<div class=\"ybc-p\">Carrier-adjusted 95% grade for drink mixes, gummies, and fortified snack lines needing dispersible flavonol content.<\/div>\n<div class=\"ybc-p\"><strong>Private Label R&amp;D<\/strong><\/div>\n<div class=\"ybc-p\">Lab samples for brands testing quercetin stability in high-heat processing (extrusion, retort) \u2014 our low-moisture 98% grade shows better thermal retention than crude extracts.<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-31752 aligncenter\" src=\"https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_155236_135.png\" alt=\"Quercetin Powder multi-application scenes for supplement formulations\" width=\"855\" height=\"392\" srcset=\"https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_155236_135.png 855w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_155236_135-400x183.png 400w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_155236_135-768x352.png 768w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_155236_135-18x8.png 18w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_155236_135-430x197.png 430w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_155236_135-700x321.png 700w, https:\/\/www.greenherbnutra.com\/wp-content\/uploads\/2026\/07\/ScreenShot_2026-07-07_155236_135-150x69.png 150w\" sizes=\"auto, (max-width: 855px) 100vw, 855px\" \/><\/div>\n<hr \/>\n<h2>Contact Greenherb for Quercetin Powder Supply<\/h2>\n<div class=\"ybc-p\">Greenherb supplies Quercetin Powder in 95% and 98% grades, with full USP-aligned COA and regulatory dossiers. We accommodate quercetin powder bulk\u200b orders from 25kg trial batches to full container loads, and can adjust carrier systems for dispersibility or compressibility on request.<\/div>\n<div class=\"ybc-p\">For technical data or sample requests, contact our sourcing team directly.<\/div>\n<div><\/div>\n<div class=\"ybc-p\">Greenherb \u2013 Your Strategic Partner for Specialty Botanical Extracts.<\/div>","protected":false},"excerpt":{"rendered":"<p><strong>Botanical Source: <\/strong>Sophora japonica<strong><br \/>\nSpecification: <\/strong>98%<strong><br \/>\nAppearance:<\/strong> Yellow Fine powder<strong><br \/>\nUsed Part: <\/strong>Flower Bud<strong><br \/>\nTest Method: <\/strong>UV<strong><br \/>\nMolecular Formula: <\/strong>C15H10O7<strong><br \/>\nMolecular Weight: <\/strong>302.236<strong><br \/>\nCAS No.: <\/strong>117-39-5<strong><br \/>\nMOQ:<\/strong> 1 kg<br \/>\n<strong>Sample:<\/strong> 20 g<br \/>\n<strong>Packing:<\/strong> 1 kg in aluminum foil bag; 25 kg in fibre drum<br \/>\n<strong>Delivery:<\/strong> FedEx, DHL, air shipment, sea shipment<br \/>\n<strong>Certifications:<\/strong> ISO, HACCP, KOSHER, HALAL, BRC<br \/>\n<strong>Features:<\/strong><br \/>\nNon-irradiated<br \/>\nGMO-free, allergen-free, TSE\/BSE-free<br \/>\nNot treated with ETO during production, storage, or transportation<\/p>","protected":false},"featured_media":31753,"template":"","meta":[],"product_brand":[1399],"product_cat":[1376],"product_tag":[],"class_list":["post-31744","product","type-product","status-publish","has-post-thumbnail","product_brand-green-herb","product_cat-functional-ingredients","first","instock","shipping-taxable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Premium Quercetin Powder \u2013 Bulk Supply &amp; 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