Xi'an Guanyu Bio-Tech Co., Ltd. is located in Xi'an City, a famous ancient cultural city in China, enjoying brilliant civilization history and rich and natural resources. Guanyu Bio-Tech specializes in the research, development, production and trade of API (active pharmaceutical ingredient). Guanyu Bio-Tech has 100 staff members, including 50 phytochemistry and medicine synthesis technicians. In 2008, our annual export value was 10 million US dollars. Guanyu Bio-Tech is mainly engaged in the research, development and production of health food raw materials and anti-cancer pharmaceutical raw materials. Health food raw materials: resveratrol, polydatin, piperine, evodiamine, icraiin, silybin, cytisine, puerarin, yohimbine, synephrine hydrochloride, curcumin, ferulic acid, ursolic acid, chlorogenec acid, saw palmetto P.E., grape skin P.E. and others Anti-cancer pharmaceutical raw