Neutrogena Cellular Boost rejuvenating serum smoothes fine lines and deep wrinkles caused by cellular burnout. The processes of cellular burnout in skin cells are thus one of the main causes of skin aging. The result is loss of elasticity, wrinkles and non-uniform skin tone. The causes of cellular burnout are mainly UV radiation, air pollution, stress and fatigue. The clinically proven serum composition contains two of the best-known rejuvenating ingredients - Retinol, which stimulates cell renewal and increases the production of its own collagen and elastin and hyaluronic acid, which helps restore the skin's protective barrier and fills wrinkles. Neutrogena Cellular Boost Soothing rejuvenating serum smoothes not only fine but also deep wrinkles.