L-Tryptophan

Hebei duling International Trade Co., Ltd. is located in Shijiazhuang, the pharmaceutical capital of China. Our company operates in various forms, including production, sales and overseas trade. At the same time, we can provide biotechnology development, consultation, exchange and promotion, technical research of biomass energy, agricultural scientific research and experimental development, etc. Our core sector is the R & D, production and sales of chemical additives and chemical intermediates.