Silymarin is considered one the best antioxidants for oily skin as it has been proven to neutralize the free radicals that contribute to blemish formation. It is a key ingredient in SkinCeuticals Silymarin CF, an oil-free antioxidant serum that 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 free radical damage, reduce excess oil, refine skin texture, smooth the appearance of fine lines, and visibly improve skin clarity.