L-lysine is an amino acids with a pharmacological use much more specific than that of most other amino acids. So far, supplementation of l-lysine is one of the best options available for the treatment of herpes simplex virus infections, especially oral forms. Specification: Content(C6H14N2O2HCL)≥98.5% Specific rotation +18° 21.5 Loss on drying ≤1.0% Burning residue≤0.3% Heavy metal≤30mg/kg Arsenic(As)≤2.0mg/kg