Ithalya IV is the formulation with the highest concen- tration of hyaluronicacid intheIthalyaline(26MG/ML) and has the highest values in terms of density and viscosity, which translate into a very high G ‘(about 600 000 m. Pas) for greater resistance and elasticity in the tissues. All that make the gel perfect for all face contouring treatments, it allows an increase in volumes in areas such as chin and cheekbones, including the treatment of facial lipoatrophies. The implant of this formulation is recommended in the medium and deep dermis.