... in 1993.2. In China, as to the Rutin, Quercetin, L-Rhamnose. Berberine Chloride, Narigin and Hesperidine , our products have:Most stable ... specificationBiggest quantity Best after-sell-service3. We have been issued GMP certificate by Chinese FDA. At the same time, Guangsong Pharmaceutical ... by:Linkwoman: Susan TangTel: 0086-028-86740041Fax: 0086-028-86757684 L-Rhamnose (GMP)