Improve the appearance of dark spots and other signs of aging with Obagi-C Fx C-Clarifying Serum. This serum is concentrated to help fade dark spots and minimize any aging signs. It is a safe alternative to plenty of skin-lightening products that include hydroquinone. This serum uses a potent blend of arbutin and vitamin C to help provide visible results, and is an excellent choice for those who cannot tolerate hydroquinone, or need a break from hydroquinone treatments. Won’t cause any irritation or sensitivity.