SkinCeuticals Discoloration DefenseProduct Details A layerable, daily wear serum, Discoloration Defense is clinically proven to reduce the appearance of visible discoloration, including hard to treat forms such as stubborn brown patches and post inflammatory discoloration. Discoloration Defense features 3% tranexamic acid, 1% kojic acid, 5% niacinamide, and 5% HEPES, an optimized cocktail of anti discoloration ingredients that works synergistically to even skin tone and reduce the