Profile: Lanzhou Weiri Bio-Engineering Co., Ltd. is engaged in the researching, developing, manufacturing and marketing of bioengineering products. We provide natural food additives. Our main products include nisin and natamycin. We are an ISO 9001:2008 and ISO 22000:2005 certified company. Nisin is a polypeptide produced by lactococcus lactis, and can be digested into amino acids by alpha chymotrypsin in the human intestine and stomach. It is used in a wide range of processed foods.