We are Xi&＃039;an Tonking Biotech Co., Ltd. based in xian, China. We are member of TradeKey.com since August, 2012. Our business is related to Health & Medicines industry and we specifically deal in many kinds of plant extract. Please find our product details below: high qulity 5-Hydroxytryptophan Product Name: Griffonia Simplicifolia Extract Powder Plant Origin: Griffonia Simplicifolia Specification: 5-HTP (5-Hydroxytryptophan) 20%-99% HPLC factory supply Alpha Arbutin Product Name: Arbutin INCI Name Arbutin Molecular Formula: C12H16O7 Molecular Weight: 272.25 Thank you for taking time to go through our business profile. If there are any questions, inquiries or comments, please feel free to contact us.