SkinCeuticals Silymarin CF A breakthrough combination antioxidant serum for oily and blemish-prone skin 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 oiliness, refine skin texture, and visibly improve skin clarity and fine lines.