LOreal Dermo Expertise Youth Code Youth Booster Serum re-awaken skins youthfulness. 10x more concentrated in pro-gen for smooth, luminous skin. introduces the new Youth Code Serum, 10 times more concentrated in the patented Pro-Gen technology than the Youth Code Day Cream. An instant boost of youthfulness. Skin looks younger and more luminous. Re-discover satin soft, smoother, more youthful looking skin. The luxurious texture instantly absorbs into the skin and your skin looks illuminated and radiant. To be applied daily, under your day and / or night creams.