XINYI HANLING BIOLOGICAL ENGINEERING CO.,LTD, has been engaged in amino acids for more than 10 years. The main products are L-Leucine, L-Tyrosine, L-Cystine, L-Cysteine HCl Monohydrate, and their derivatives. The feather is firstly used in Hanling as raw material to produce amino acids in China and the output of tyrosine is the highest in China. Xinyi Hanling has passed Kosher certificate and all products meet AJI92 and USP standard.