... is highly efficient, safe, and has no side-effects. Poly-L-lysine (ε-poly-L-lysine, EPL) is a small natural homopolymer of ... amino acid L-lysine that is produced by bacterial fermentation. ε-Poly-L-lysine is used as a natural preservative in food ... metals≤20ppmArsenic≤4ppmBest regards,Nicole HuangHenan Kingway Chemicals Co., Ltd. Poly-L-lysine