What it is: A firming serum that is the perfect ally for skin that lacks firmness.What it does: The serum's firming action makes it possible to regain the appearance of more youthful skin. Daily use of this serum helps to optimize results on the look of skin's firmness, density and the feel of elasticity. How to use: Apply the concentrated serum in the morning and evening to clean, dry skin on the face and neck by massaging gently until fully absorbed. 1 oz.