This clinical-level serum features highly stable 25% vitamin C to visibly improve uneven tone, radiance, elasticity & firmness without irritation. - Potent 25% vitamin C targets stubborn discoloration & sun damage - Glutathione minimizes irritation & boosts skin’s antioxidant supply - GAP technology reduces oxidative stress & targets discoloration - Lightly hydrating serum for all skin types What is it? 25% Vitamin C + Glutathione Clinical Serum is formulated with a highly stable blend of oil-and-water soluble vitamin C for optimal effectiveness. Glutathione + GAP technology (glutathione amino acid precursors) work to minimize irritation while amping up antioxidant protection and ingredient stability. This clinical-level formula helps sustain a natural level of glutathione & vitamin C within skin’s most uppermost layers for extended results, while reducing oxidative stress that triggers discoloration. Benefits: This lightweight serum is clinically proven to improve uneven tone + discoloration while boosting radiance and brightening dullness. The pro-collagen formula visibly firms and improves the look of elasticity so you get advanced results—without irritation. How to use: Apply onto face and neck. For optimal results, use AM and PM. For daytime, follow with SPF 30+.