Antioxidant serums are essential for promoting and maintaining the health of all skin types, but one particular antioxidant called silymarin has been proven to neutralize the damage caused by environmental stressors that contribute to blemish formation. A key ingredient in SkinCeuticals Silymarin CF, this oil-free antioxidant serum is also formulated with L-ascorbic acid (the purest form of vitamin C), ferulic acid, and salicylic acid. Together, the ingredients in this antioxidant serum help protect the skin from environmental stressors, reduce excess oil, refine skin texture, smooth the appearance of fine lines, and visibly improve skin clarity.