Introducing the New Forever Youth Liberator Night Crème. YSL Skinscience has developed a powerful patented skincare range enriched with Glycanactif tm, a combination of 3 glycans to help enhance the youthful properties of the skin. After the first night of use the skin feels firmer and appears more refreshed. Night after night, the face looks smoother and more rested as if after a long night's sleep.