Fillerina Eyes and Eyelids Grade 4 has been formulated in 2 different increasing concentrations to be chosen according to the individual needs. Eyes and Eyelids is a replenishing gel preparation that helps the replenishment of the crow\'s feet around the eyes and the lifting effect on the eyelids thanks to the 8 molecules of Hyaluronic Acid with different molecular weights and the 3 molecules of Collagen, still with different molecular weights, that help the plumping effect. All molecules have been ex vivo tested by means of the Franz Cells, thanks to their capability to be absorbed by the skin. The mix of molecules is calibrated to adapt to the skin of the eye contour and to optimize their absorption, as well as the replenishing and the plumping effect. Grade 4 targets deep crow\'s feet wrinkles and marked sagging of the eyelids. How to choose your grade with Fillerina: - Grade 1 has a higher concentration of larger molecules for plumping and hydration. - Grade 2 has a perfect blend of all size molecules. - Grade 3 has a higher concentration of smaller molecules, which are needed to travel to the deeper layers of the skin for filling moderate wrinkles. - Grade 4 & 5 have larger amounts of NEW smaller molecules to penetrate to the deepest layers of the skin for the filling of deep to very deep expression lines and loss of volume. Recommended for very mature skin.