Obagi-C Rx C-Clarifying Serum for Normal to Oily skin is a prescription-only treatment that combines 4% hydroquinone with 10% L-ascorbic acid (vitamin C) to reduce hyperpigmentation and improve skin tone. Hydroquinone inhibits melanin production to fade dark spots and melasma, while vitamin C provides antioxidant protection and brightens the skin. This formula is optimized for oily and combination skin types.. Please Note that product description, color, ingredients, package and other information maybe different from the original pack kindly check the product for more accurate details.