Lysozyme is abundantly found in animal and plant kingdoms. It is a natural food preservative and also found to be present in specific bacterial cell walls. Lysozyme is usually present in tears, milk, urine and saliva.Enzyme breaks down the cell walls of bacteria; used to prepare spheroplasts.

Lysozyme from chicken egg white has been used in dielectric spectroscopy studies of dynamics of protein, as a control to measure the human lysosyme activity, as a supplement in soaking solution to treat lenses.