Bacterial lysates are natural substances secreted by many bacteria in the process of life.These polypeptides inhibit the growth of other microorganisms. Bacterial lysates up-regulate the immune system, maintain it in a state of alert and raise the defense against infections. This action provides a significant reduction (or a complete disappearance) in symptoms of microbial infections. Uses in dermatology In dermatology, bacterial lysates have a powerful skin cleansing effect. These preparations protect and restore damaged skin.