Serum: its a must-have in any high-performance skincare routine, penetrating the skins surface to deliver targeted ingredients. Why not opt for StriVectins Advanced Retinol Concentrated Serum Combining the anti-ageing benefits of retinol with the clinically proven results of patented NIA-114 technology, it improves cell turnover, enhances firmness and diminishes the appearance of fine lines and wrinkles.