Now formulated with even more Vitamin C, Dermatologist Solutions Powerful-Strength Line-Reducing Concentrate incorporates 10.5% L-Ascorbic Acid and 2% Ascorbyl Glucoside. In addition to Vitamin C, this anti-ageing serum now includes Hyaluronic Acid. The formula helps reduce the appearance of lines and wrinkles while helping to improve the feel of skins texture. Skin looks radiant and feels smoother. This Vitamin C serum is carefully-formulated to provide clinically-proven results in a concentration gentle enough for sensitive skin. Key features: - Clinically-demonstrated to boost skins radiant look whilst visibly reducing the appearance of lines and wrinkles. - Improves the feel of skin texture and minimizes the appearance of pores. - Carefully-formulated for all skin types, even sensitive skin. - Kiehl's Cool Fact: Our chemists stabilized 10.5% Pure Vitamin C in a water-free formula more than 13 years ago. Now, this formula includes 12.5% Vitamin C along with Hyaluronic Acid.