REVITAJAL Dermal fillers offers cross linked Hyaluronic acid (HA) which is an essential component of the connective tissues in humans and other mammals. It gives the skin its properties of resistance and its abilities to maintain its shape. In fact a deficiency of HA causes a weakening of the skin with the formation of wrinkles and blemishes. Its concentration in the tissues tends to decrease with age due to the presence of particular enzymes, hyaluronidases, which catalyze HA chain degradation.