New, Unused StriVectin Lactic Acid Nightly Retexturizing Serum What it is: A serum that combines the benefits of expert exfoliation with advanced hydration in one potent but gentle formula. What it does: Lactic acid smoothes skin while helping to visibly improve skin's natural moisturizing factors to leave the complexion glowing, baby-soft and visibly renewed. It's infused with patented NIA-114™, dry skin-soothing blue cypress and a youth-boosting overnight nonapeptide for revitalized radiance by morning.