Shanghai Natural Bio-engineering Co., Ltd, established in 2003, is a professional large-scale high-tech manufacturer of raw materials for nutraceuticals, nutritional supplements, and pharmaceuticals， and plant extracts, Active Pharmaceutical Ingredient (API) & intermediates are our focused areas. Shanghai Natural Bio-engineering Co., Ltd, engaging in cultivation, R & D, mass production, sales & marketing of novel ingredients in nutrition and pharmaceutical industries, now owns three subsidiaries: production base—Hunan Keyuan Bio-products Co.,Ltd;R&D base—Shanghai Zheyuan Pharmaceutical Technology Research Institute and Shanghai Chuyuan Industrial Co.,Ltd. The main products of Shanghai Natural Bio-engineering include Japanese knotweed extract (Polygonum cuspidatum) Resveratrol, 5-HTP..