SkinCeuticals Silymarin CF Serum 1 fl. ozSilymarin CF is a breakthrough vitamin C serum for oily and blemish prone skin that combines 0. 5% silymarin (milk thistle extract), 15% l ascorbic acid, 0. 5% ferulic acid and 0. 5% salicylic acid to help prevent oil oxidation that can lead to breakouts, and visible signs of aging. This oil free formula is clinically demonstrated to reduce oil oxidation by up to 76%, as well as reduce oiliness, refine skin texture, and visibly improve skin clarity