The star of the forever youth liberator range, the serum contains the highest concentration of glycanactif, specially formulated to help restore your skins youthful beauty. How to use : Usage shake well before use. apply the foundation after your day cream. Place a single dose on the back of your hand and apply to the face starting with the middle and then reaching the outer contours of the face. With fingertips for a more natural look with brush for a more sophisticated satin finish.