Advanced Night Repair serum works night and day to help optimize skin's natural rhythm of repair and protection. At night, with our exclusive 1-in-60-million Night Peptide, it helps support skin's visible renewal and firming. Hyaluronic Acid helps lock in moisture. By day, this serum with 8-hour antioxidant protection helps defend skin against visible effects of free radical damage from environmental sources like pollution. This is the high-performance face serum beautiful skin can't live without.