It also acts on the surface by smoothing the epidermis, by stimulating the cellular metabolism of skin tissues. It fights skin aging and wrinkle formation, keeping the skin firm, elastic and soft. Peptides: they are activators of the main biological functions. They play a key role in processes that depend on the vitality, youth and beauty of the skin. Collistar has selected two peptides particularly effective in the treatment of the eye area. The first, tetrapeptide 5, reduces and prevents the most common imperfections of the eye, acting specifically against bags and dark circles. The second, hexapeptide 8, minimizes the lines of expression, the so-called 'crow's feet', smoothing and extending the epidermis.