SkinCeuticals Silymarin CFAn oil free vitamin C serum for oily skin and acne prone skin that delivers advanced environmental protection, reduces oiliness, refines skin texture, and visibly improves fine lines. Silymarin CF is a breakthrough vitamin C serum for oily and acne prone skin that combines 0. 5% silymarin (milk thistle extract), 15% l ascorbic acid, 0. 5% ferulic acid, and 0. 5% salicylic acid. This oil free formula is clinically demonstrated to reduce oiliness,