Each gram of Obagi Nu-Derm® Clear contains: Active Ingredient:: Hydroquinone, USP 4% (40 mg/g) Inactive Ingredients: ascorbic acid, BHT, butylparaben, cetyl alcohol, disodium EDTA, glycerin, lactic acid, methylparaben, phenyl trimethicone, PPG-2 myristyl ether propionate, propylparaben, saponins, sodium lauryl sulfate, sodium metabisulfite, TEA-stearyl alcohol, tocopheryl acetate, water (aqua)