Allies of Skin 20% Vitamin C Brighten + Firm Serum is a next-generation 20% Vitamin C formula, supercharged with 2% Citrus Cell Complex, an Antioxidant Complex of Glutathione and 3 Antioxidants for intense brightening, firming and antioxidant protection. It forms a protective shield against daily external aggressors and pollutants while paving the way for brighter, firmer skin. This antioxidant-rich serum promotes radiance - enhancing elasticity and fading dullness. Over time, skin glows with a brilliant smoothness.