with hyaluronic acid protects the skin from external aggressions and moisturizes the skin, giving it elasticity and luminosity. All this is possible thanks to the ability of hyaluronic acid to bind a large amount of water molecules and create a non-clogging surface film. In addition, the micro crystals of hyaluronic acid penetrate into the deeper layers of the epidermis, where they intervene in the cellular processes related to both tissue repair and temporary filling of fine lines. BIO SIERO can be used on all skin types, including sensitive, dry and combination skin.