Skinceuticals Metacell Renewal B3 is formulated with a high concentration of multi-corrective active ingredients, including 5% Niacinamide which helps stimulate epidermal cell turnover and strengthen the skin's moisture barrier. 2.5% tightening tri-peptide concentrate helps enhance skin firmness, reduce fine lines and boost hydration volume. 15% pure glycerin, a powerful humectant, helps to deliver intense hydration without a sticky or tacky feel.