Obagi-C Therapy Night CreamGradually diminishes dark spots with 4% hydroquinone, and provides Vitamins C and E to your skin while you sleep Active Ingredient: 4% Hydroquinone Key Ingredients: Vitamin C, Vitamin E *Contains sodium metabisulfite, a sulfite that may cause allergic type reactions including anaphylactic symptoms and life threatening or less severe asthmatic episodes in certain susceptible people. The overall prevalence of sulfite sensitivity in the general