Polylysine is a homopolymer that consists of 25-35 L-lysine residues. It’s produced by a fermentation process using Streptomyces albulus under aerobic conditions.ε- Polylysine can greatly inhibit the growth of Gram-positive bacteria, Gram-negative bacteria, yeasts, moulds, viruses etc. It has been widely used in food, daily chemical, pharmaceutical and other industries, Polylysine can be completely digested and absorbed by the body, and broken down into the essential lysine in human body without any side effect.