Eucerin Anti-Pigment Dual Serum Thiamidol & Hyaluronic Acid is a dual action serum which works to reduce the appearance of hyperpigmentation, leaving your skin clear and smooth. Eucerin Anti-Pigment Dual Serum Thiamidol & Hyaluronic Acid effectively reduces the appearance of dark spots and prevents them reappearing. The light serum contains Thiamidol that acts at the root cause of hyperpigmentation, helping to prevent its re-appearance whilst the inclusion of Concentrated Hyaluronic Acid allows skin to attract and retain moisture. Your skintone is more even and looks smooth and radiant. You should be able to notice initial results after using the serum for two weeks and continuous useage will only improve your skintone.