This gentle, hydrating serum delivers clinicallevel vitamin C to target stubborn discoloration & sun damage without irritation. Glutathione and GAP technology soothe, maintain skin's natural antioxidant levels longterm, and reduce oxidative stress that triggers discoloration. Ingredients: 25% Vitamin C: Visibly improves tone, discoloration and dark spots. Glutathione: Strengthens skin's defenses and supports vitamin C. Ergothioneine: Supports skin's natural antioxidants. Clinical Results: Based on an independent clinical study with 32 subjects after 8 weeks: Clinically proven to visibly improve uneven tone, discoloration, radiance, firmness, and elasticity 94% had visibly improved discolorations 91% had brighterlooking skin | Paula's Choice 25% Vitamin C+ Glutathione Clinical Serum, 1 fl. oz | Dermstore