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we are the Tsinghua University - Chengzhishareholding - Chengzhi Life Science Co., Ltd. It was established in 2000, had produced D- ribose for 10 years, is now the world's largest supplier of D- ribose. we are a manufacturer with HACCP, BRC, HALAL, KOSHER certificate, our factory covers 22000 meters .In addition to D- ribose, alpha arbutin, L- glutamine, BCAA, Sodium Hyaluronate and other Amino acids are supplied too. At chengzhi, we are committed to providing the highest level of customer service, competitive pricing, speedy delivery and a comprehensive, high-quality product offering. Our ultimate goal is your satisfaction.