Shijiazhuang Shixing Amino Acid Co Ltd Produces L-, D-, DL-amino acids and compound amino acids, used in pharmatical & food additive.
http://www.aminoacid-chem.com/
Sichuan Tongsheng Amino Acid Co Ltd Specializing in the production of amino acids ,amino acids derivatives and biochem reagent.
http://www.aminoacids.cn/
