We,Tai'an Zhonghui Plant Biochemical Co.,Ltd. are one of the leading manufacturer of plant extracts,herb extracts and botanical extracts in China. We can supply all kinds of standardized extracts and ratioed extracts. we enjoy very good reputation in the world market.Hope we can cooperate with you in near future. Now we can supply the Resveratrols (Polygonum Cuspidatum Extract) with the following specification: Resveratrols 50% Min (HPLC) Resveratrols 98-99% Min (HPLC) Giant knotweed Rhizome PE 10:1 Resveratrol is present in a wide variety of plants of the edible plants, mainly in grapes and peanuts. Wine is the primary dietary source of resveratrol. Red wine contains much greater amounts of resveratrol than does white wine, since resveratrol is concentrated in the grape skin and the manufacturing process of red wine includes prolonged contatc with grape skins. Resveratrol is also available as a dietary supplement. Resveratrol has been used for: Anti-Cancer Atherosclerosis ATTN: Robert Ai Mob: +86-13792108872 TEL: 86-538-7506189 FAX: 86-538-7513518 EMAIL: robbin.ai@163.com MSN: naturalextract@hotmail.com Http://www.tazhonghui.com Tai'an Zhonghui Plant Biochemical Co.,Ltd