The Kiehl's anti-aging bestseller is back with an even more effective vitamin C and hyaluronic acid formula that instantly and sustainably reduces lines and wrinkles while restoring skin's natural radiance. More than ten years ago, the Powerful Strength Line Reducing Concentrate Serum was a milestone in the formulation of anti-ageing products with 10.5% pure vitamin C concentrate. After years of research and the latest dermatological findings, Kiehl's has made another innovation by expanding the formula to 12.5% pure vitamin C concentrate. The latest, groundbreaking formula therefore consists of 10.5% pure vitamin C, which promotes collagen formation in the skin in order to sustainably support the skin's elasticity. A further 2% vitamin Cg (ascorbyl glucoside) has been added to the formula to actively promote the skin's evenness and radiance in the long term. To further reduce the appearance of wrinkles, the formula of the new Powerful Strength Line Reducing Concentrate is based on hya