xinyi Hanling biological engineering co.,ltd,  has been engaged in amino acids for over 10 years. We deal with all processes in our factories. In 2008, xinyuan biotechnology Co.,ltd and Zhijiang Guanghong amino acids co., Ltd jointed in Hanling. We has been achieved GMP, Halal, Kosher certificates. Our L-Cystine comes up to 100MT/month, part of them is processed into L-Cysteine hcl mono and anhy, dl-cystine, dl-cysteine hcl mono and N-Acetyl-L-Cysteine, L-Cysteine base according to the customer's demand. we are also the largest producer of L-Leucine and L-Tyrosine in China and has been exported to many country and get high raise.  Our L-Arginine base and L-Aringine Hcl, L-Histidine base and L-Histidine hcl Mono and hydrolysed animal proteine, hydrolysed animal protein, amino acid liquid used for fertilizer, l-isoleucine, l-valine, l-lysine hcl, l-proline, dl-methionine are sold well.